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LONG-TERM DEBT AND CREDIT FACILITIES - Narrative (Details)
7 Months Ended 12 Months Ended
Oct. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
$ / shares
Rate
May 31, 2016
USD ($)
May 31, 2015
USD ($)
May 31, 2014
USD ($)
Feb. 28, 2019
Feb. 28, 2018
Aug. 31, 2017
Feb. 28, 2017
Debt Instrument [Line Items]                  
Loan, face amount   $ 187,274,000 $ 145,938,000 $ 62,500,000          
Other restrictions on payment of dividends (in dollars per share) | $ / shares   $ 0.01              
Interest expense, debt   $ 108,600,000 $ 67,900,000 $ 39,900,000 $ 37,500,000        
2016 Credit Facility                  
Debt Instrument [Line Items]                  
Minimum interest coverage ratio   2.25              
Secured Debt                  
Debt Instrument [Line Items]                  
Loan, face amount $ 5,030,000,000.00                
Secured Debt | Term Loan A                  
Debt Instrument [Line Items]                  
Loan, face amount 1,750,000,000.00                
Effective interest rate percentage | Rate   3.02%              
Secured Debt | Term Loan A-2                  
Debt Instrument [Line Items]                  
Loan, face amount 1,480,000,000                
Effective interest rate percentage | Rate   2.97%              
Periodic payment of debt 1,700,000                
Secured Debt | Term Loan B                  
Debt Instrument [Line Items]                  
Loan, face amount 542,000,000                
Interest rate percentage at period end | Rate   3.27%              
Periodic payment of debt 1,400,000                
Secured Debt | Revolving Credit Facility                  
Debt Instrument [Line Items]                  
Loan, face amount 1,250,000,000.00                
Secured Debt | 2015 Term Loan due October 2021                  
Debt Instrument [Line Items]                  
Loan, face amount 43,800,000                
Secured Debt | Term A-2 Loan Due October 2021                  
Debt Instrument [Line Items]                  
Periodic payment of debt $ 8,600,000                
Interest Rate Swap                  
Debt Instrument [Line Items]                  
Variable rate debt   $ 1,000,000,000              
Accumulated other comprehensive income related to interest rate swap   5,300,000              
Line of Credit                  
Debt Instrument [Line Items]                  
Maximum borrowing capacity   691,700,000              
Lines of credit facility, available borrowings   882,600,000              
Repayments of lines of credit   51,000,000              
Amount outstanding under lines of credit, current   $ 392,100,000              
Short term debt, weighted average interest rate   1.90%              
Line of credit facility, average outstanding amount   $ 365,900,000              
Scenario, Forecast | 2016 Credit Facility                  
Debt Instrument [Line Items]                  
Maximum covenant leverage ratio           4.00 4.25 4.5 4.75
Revolving Credit Facility | Secured Debt                  
Debt Instrument [Line Items]                  
Interest rate percentage at period end | Rate   2.97%              
Letter of Credit | Line of Credit                  
Debt Instrument [Line Items]                  
Maximum borrowing capacity   $ 100,000,000              
Standby Letters of Credit | Line of Credit                  
Debt Instrument [Line Items]                  
Lines of credit facility, available borrowings   $ 446,300,000