Revolving Credit Facilities and Long-Term Debt - Revolving Credit Facilities and Long-Term Debt (Details)
 1 Months Ended 12 Months Ended
Dec. 30, 2017
Jul. 01, 2017
May 26, 2017
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Apr. 01, 2017
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Jun. 29, 2015
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Feb. 23, 2015
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Nov. 05, 2014
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Apr. 26, 2014
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Apr. 01, 2017
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Mar. 26, 2016
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Mar. 28, 2015
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Nov. 04, 2014
Apr. 15, 2014
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Apr. 14, 2014
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Apr. 13, 2014
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May 31, 2013
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Revolving credit facilities and long-term debt                                
Term loan       $ 196,500,000         $ 196,500,000              
Dividends paid               $ 41,300,000     $ 41,300,000          
Interest expense                                
Revolving credit facilities and long-term debt                                
Amortization of deferred loan fees                 1,100,000 $ 800,000            
February 2015 Wells Fargo Bank credit facility                                
Revolving credit facilities and long-term debt                                
Existing indebtedness refinanced         $ 150,000,000                      
Interest expense                   800,000            
Transaction fee paid           $ 1,400,000                    
February 2015 Wells Fargo Bank credit facility | Interest expense                                
Revolving credit facilities and long-term debt                                
Deferred loan fees written off         1,400,000                      
Wells Fargo Bank revolving credit facility                                
Revolving credit facilities and long-term debt                                
Current borrowing capacity           75,000,000                    
Wells Fargo Bank letters of credit                                
Revolving credit facilities and long-term debt                                
Current borrowing capacity           5,000,000                    
Wells Fargo Bank term loan                                
Revolving credit facilities and long-term debt                                
Principal amount           75,000,000                    
Additional incremental term loan capacity           50,000,000                    
2015 Golub Term Loan                                
Revolving credit facilities and long-term debt                                
Principal amount         $ 200,000,000                      
Interest expense                 $ 11,200,000 $ 8,300,000            
Weighted average interest rate (as a percent)       5.50%         5.50% 5.50%            
Required payment frequency         quarter                      
Periodic payment         $ 500,000                      
Additional interest rate required if certain triggering events come into existence (as a percent)         2.00%                      
Deferred loan fees       $ 3,900,000 $ 5,600,000       $ 3,900,000 $ 4,900,000            
Term loan       196,500,000         196,500,000 198,500,000            
Unamortized value of the debt issuance costs and debt discount       (3,921,000)         (3,921,000) (4,886,000)            
Total       $ 192,579,000         192,579,000 193,614,000            
2015 Golub Term Loan | Base rate                                
Revolving credit facilities and long-term debt                                
Basis margin (as a percent)         3.50%                      
2015 Golub Term Loan | Federal funds rate                                
Revolving credit facilities and long-term debt                                
Basis margin (as a percent)         0.50%                      
2015 Golub Term Loan | One-month LIBOR rate                                
Revolving credit facilities and long-term debt                                
Basis margin (as a percent)         1.00%                      
2015 Golub Term Loan | LIBOR                                
Revolving credit facilities and long-term debt                                
Basis margin (as a percent)         4.50%                      
2015 Golub Term Loan | Minimum | LIBOR                                
Revolving credit facilities and long-term debt                                
Interest rate (as a percent)         1.00%                      
2015 Golub Term Loan | Maximum                                
Revolving credit facilities and long-term debt                                
Consolidated total net leverage ratio       4.25                        
2015 Golub Term Loan | Leverage ratio as of July 1, 2017 | Maximum | Subsequent Event                                
Revolving credit facilities and long-term debt                                
Consolidated total net leverage ratio   4.75                            
2015 Golub Term Loan | Leverage ratio as of December 30, 2017 | Maximum | Subsequent Event                                
Revolving credit facilities and long-term debt                                
Consolidated total net leverage ratio 4.50                              
2015 Golub Term Loan | Leverage ratio as of December 2018 | Maximum | Subsequent Event                                
Revolving credit facilities and long-term debt                                
Consolidated total net leverage ratio     4.00                          
Revolving credit facility (PNC Bank, N.A.)                                
Revolving credit facilities and long-term debt                                
Borrowing capacity                         $ 70,000,000 $ 60,000,000    
Interest expense                     2,600,000          
Repayment of line of credit           50,800,000                    
Letter of Credit (PNC Bank, N.A.)                                
Revolving credit facilities and long-term debt                                
Borrowing capacity                               $ 5,000,000
$130 million term loan due May 2019 (Golub Capital LLC)                                
Revolving credit facilities and long-term debt                                
Principal amount                           $ 130,000,000 $ 99,200,000  
Interest expense                     $ 6,800,000          
Effective interest rate (as a percent)             6.75%         7.00%        
Repayments of loan           47,300,000 $ 81,900,000                  
Pre-payment penalty           1,100,000                    
$130 million term loan due May 2019 (Golub Capital LLC) | Interest expense                                
Revolving credit facilities and long-term debt                                
Pre-payment penalty             600,000                  
Amortization of deferred loan fees             $ 1,700,000                  
$130 million term loan due May 2019 (Golub Capital LLC) | Minimum                                
Revolving credit facilities and long-term debt                                
Interest rate (as a percent)             1.00%         1.25%        
2013 Golub Loan and PNC Line of Credit | Interest expense                                
Revolving credit facilities and long-term debt                                
Deferred loan fees           $ 1,400,000                    
June 2015 Wells Fargo Revolver                                
Revolving credit facilities and long-term debt                                
Borrowing capacity         $ 125,000,000                      
Commitment fee on unused capacity (as a percentage)         0.25%                      
Amount outstanding under 2015 Wells Fargo Revolver       $ 33,300,000         33,300,000 48,800,000            
Interest expense                 $ 1,500,000 $ 900,000            
Weighted average interest rate (as a percent)       1.90%         1.90% 1.70%            
Additional interest rate required if certain triggering events come into existence (as a percent)         2.00%                      
Deferred loan fees       $ 600,000 $ 900,000       $ 600,000 $ 800,000            
June 2015 Wells Fargo Revolver | Subsequent Event                                
Revolving credit facilities and long-term debt                                
Borrowing capacity     $ 135,000,000                          
June 2015 Wells Fargo Revolver | Federal funds rate                                
Revolving credit facilities and long-term debt                                
Basis margin (as a percent)         0.50%                      
June 2015 Wells Fargo Revolver | One-month LIBOR rate                                
Revolving credit facilities and long-term debt                                
Basis margin (as a percent)         1.00%                      
June 2015 Wells Fargo Revolver | Minimum                                
Revolving credit facilities and long-term debt                                
Consolidated fixed charge coverage ratio         1.00                      
June 2015 Wells Fargo Revolver | Minimum | Base rate                                
Revolving credit facilities and long-term debt                                
Basis margin (as a percent)         0.00%                      
June 2015 Wells Fargo Revolver | Minimum | LIBOR                                
Revolving credit facilities and long-term debt                                
Basis margin (as a percent)         1.00%                      
June 2015 Wells Fargo Revolver | Maximum | Base rate                                
Revolving credit facilities and long-term debt                                
Basis margin (as a percent)         0.25%                      
June 2015 Wells Fargo Revolver | Maximum | LIBOR                                
Revolving credit facilities and long-term debt                                
Basis margin (as a percent)         1.25%