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Derivative Financial Instruments and Hedging Activities - Cash Flow Hedges (Details) - USD ($)
May 31, 2019
Nov. 30, 2018
Aug. 31, 2018
2017 Term Loan Facility | Term Loan Facility | Line of Credit      
Derivative [Line Items]      
Maximum borrowing capacity   $ 500,000,000  
Amount of hedged item $ 400,000,000.0    
2018 Term Loan Facility | Term Loan Facility | Line of Credit      
Derivative [Line Items]      
Maximum borrowing capacity     $ 350,000,000
Cash flow hedging | Interest rate swaps | Anticipated debt issuance      
Derivative [Line Items]      
Aggregate notional amount 200,000,000    
Cash flow hedging | Interest rate swaps | 2018 Term Loan Facility      
Derivative [Line Items]      
Aggregate notional amount 350,000,000    
Cash flow hedging | Interest rate swaps | 2017 Term Loan Facility      
Derivative [Line Items]      
Aggregate notional amount 200,000,000    
Cash flow hedging | Interest rate swaps | 2017 Term Loan Facility      
Derivative [Line Items]      
Aggregate notional amount $ 200,000,000