Income Taxes - Additional Information (Detail) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 28, 2015
Mar. 29, 2014
Dec. 27, 2014
Dec. 28, 2013
Dec. 29, 2012
Income Taxes [Line Items]          
Liabilities for uncertain tax positions $ 0   $ 0    
Income tax expense or benefit recognized in other comprehensive loss     0 $ 0 $ 0
Interest and penalties recognized in income tax expense 0 $ 0      
Deferred tax assets, net 50,500,000        
Valuation allowance 69,000,000   2,523,000 1,826,000  
Deferred tax liability, book aggregate reserves 6,900,000        
Deferred tax liability, fixed assets 10,900,000        
Provision for income taxes $ (4,468,000) $ (596,000) (6,983,000) $ (2,647,000) $ (3,920,000)
Percentage of benefits to be paid on tax receivable agreement 85.00%        
Federal [Member]          
Income Taxes [Line Items]          
Net operating loss carryforwards     18,900,000    
State and Local Jurisdiction [Member]          
Income Taxes [Line Items]          
Net operating loss carryforwards     $ 800,000    
Federal And State Jurisdiction [Member]          
Income Taxes [Line Items]          
Operating loss carryforwards, expiry year     2033    
Minimum [Member]          
Income Taxes [Line Items]          
Tax years open subject to audit     2011    
Maximum [Member]          
Income Taxes [Line Items]          
Tax years open subject to audit     2014    
Limited Liability Company [Member]          
Income Taxes [Line Items]          
Provision for income taxes $ 0