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Debt and Receivables Securitization - Additional Information (Detail)
6 Months Ended
Nov. 30, 2016
USD ($)
Debt And Receivables Securitization [Line Items]  
Letter of credit amount outstanding $ 15,266,000
Remaining borrowing capacity 486,400,000
Securities Sold under Agreements to Repurchase  
Debt And Receivables Securitization [Line Items]  
Maximum borrowing capacity $ 100,000,000
Maturity date 2018-01
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
Maturity date 2020-04
Borrowings outstanding $ 0
Unsecured Revolving Credit Facility | Maximum  
Debt And Receivables Securitization [Line Items]  
Debt maturity period 1 year
Letter of Credit [Member]  
Debt And Receivables Securitization [Line Items]  
Letter of credit amount outstanding $ 13,600,000