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New Accounting Pronouncements (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 31, 2016
May 31, 2017
May 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Increase to net non-current deferred tax assets $ 4,225 $ 6,027 $ 3,473
Decrease to non current deferred tax liabilities 1,223 $ 1,111 1,278
New Accounting Pronouncement, Early Adoption [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Increase to net non-current deferred tax assets 3,300   2,400
Decrease to non current deferred tax liabilities 12,000   $ 12,100
Increase in operating activities and decrease from financing activities $ 100