LONG-TERM DEBT - PRIOR CREDIT AGREEMENT - SUMMARY (Details) - USD ($)
Jun. 29, 2017
Jun. 18, 2014
Apr. 30, 2018
Mar. 07, 2014
Feb. 03, 2014
Debt Instrument          
Common Stock Issued (in shares)   5,750,000      
Prior Credit Agreement (as amended)          
Debt Instrument          
Line of Credit Facility, Maximum Borrowing Capacity     $ 943,500,000    
February 2014 Term Loans          
Debt Instrument          
Long-term Debt, Gross         $ 300,000,000
March 2014 Term Loans          
Debt Instrument          
Long-term Debt, Gross       $ 643,500,000  
Prior Revolving Credit Facility          
Debt Instrument          
Line of Credit Facility, Maximum Borrowing Capacity     $ 300,000,000    
Proceeds from (Repayments of) Secured Debt   $ 106,000,000      
2014 Term Loans          
Debt Instrument          
Proceeds from (Repayments of) Secured Debt $ 406,900,000 $ 530,000,000