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New Accounting Pronouncements (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Nov. 30, 2016
Nov. 30, 2015
Aug. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Decrease non current deferred tax liabilities $ 2,338 $ 8,237 $ 1,223
Income tax benefit 462 3,452  
New Accounting Pronouncement, Early Adoption [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Increase to net non-current deferred tax assets   2,000 3,300
Decrease non current deferred tax liabilities   10,300 $ 12,000
Income tax benefit $ 100    
Increase in operating activities and decrease from financing activities   $ 100