Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies New Accounting Pronouncements (Details)

v3.20.2
Summary of Significant Accounting Policies New Accounting Pronouncements (Details) - USD ($)
$ in Thousands
Aug. 31, 2020
Aug. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Operating Lease, Right-of-Use Asset $ 48,733  
Retained Earnings (Accumulated Deficit) [Abstract]    
Retained earnings 917,671 $ 915,466
Accounting Standards Update 2016-02 [Member]    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Operating Lease, Right-of-Use Asset 60,800  
Accounting Standards Update 2016-02 [Member] | Revision of Prior Period, Accounting Standards Update, Adjustment [Member]    
Retained Earnings (Accumulated Deficit) [Abstract]    
Retained earnings 200  
Accounting Standards Update 2018-02 [Member] | Revision of Prior Period, Accounting Standards Update, Adjustment [Member]    
Retained Earnings (Accumulated Deficit) [Abstract]    
Retained earnings $ 3,700