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Stockholders' Equity - Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
Feb. 28, 2021
Nov. 30, 2020
Aug. 31, 2020
Feb. 29, 2020
Nov. 30, 2019
Aug. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Total AOCL $ 980,468 $ 952,573 $ 896,375 $ 716,760 $ 691,877 $ 672,256
Accumulated unrealized losses on cash flow hedges            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Total AOCL (404)   (1,591)      
Accumulated foreign currency translation adjustments            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Total AOCL (28,092)   (37,702)      
Accumulated Other Comprehensive Loss            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Total AOCL $ (28,496) $ (39,076) $ (39,293) $ (66,479) $ (64,706) $ (74,544)