Annual report pursuant to Section 13 and 15(d)

Revenue from Contracts with Customers Disaggregation of Revenue (Details)

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Revenue from Contracts with Customers Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 31, 2020
Aug. 31, 2019
Disaggregation of Revenue [Line Items]    
Revenues $ 493,292 $ 654,758
Revenue, Remaining Performance Obligation, Amount 2,100  
Transferred at Point in Time [Member]    
Disaggregation of Revenue [Line Items]    
Revenues 361,359 453,427
Transferred over Time [Member]    
Disaggregation of Revenue [Line Items]    
Revenues $ 131,933 $ 201,331