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Debt and Receivables Securitization - Additional Information (Detail) - USD ($)
3 Months Ended
Feb. 16, 2018
Aug. 31, 2018
May 31, 2018
Debt And Receivables Securitization [Line Items]      
Remaining borrowing capacity   $ 487,200,000  
Securities Sold under Agreements to Repurchase      
Debt And Receivables Securitization [Line Items]      
Borrowings outstanding     $ 0
Number of days past due trade accounts receivables are ineligible for securitization   90 days  
Unsecured Revolving Credit Facility      
Debt And Receivables Securitization [Line Items]      
Maximum borrowing capacity   $ 500,000,000  
Debt maturity period 3 years    
Maturity date 2023-02    
Debt issuance costs   805,000  
Borrowings outstanding   $ 0  
Unsecured Revolving Credit Facility | Maximum      
Debt And Receivables Securitization [Line Items]      
Debt maturity period   1 year  
Stand-by Letters of Credit      
Debt And Receivables Securitization [Line Items]      
Letter of credit amount outstanding   $ 13,912,000  
Drawn amount of letter of credit outstanding   0  
Letter of Credit      
Debt And Receivables Securitization [Line Items]      
Letter of credit amount outstanding   $ 12,800,000