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Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 31, 2020
Aug. 31, 2019
Aug. 31, 2018
Accumulated other comprehensive income      
Balance $ 271,227 $ 246,756 $ 210,929
Total other comprehensive income (loss) 2,620 (1,988) 1,133
Balance 302,792 271,227 246,756
Accumulated Other Comprehensive Income (Loss)      
Accumulated other comprehensive income      
Balance (14,324) (12,336) (13,469)
Other comprehensive gains (losses) before reclassifications 2,028 (2,720)  
Reclassifications to net income of previously deferred (gains) losses 592 732  
Total other comprehensive income (loss) 2,620 (1,988)  
Adoption of ASU 2018-02 (1,388)    
Balance (13,092) (14,324) (12,336)
Restricted investments      
Accumulated other comprehensive income      
Balance 154 126  
Other comprehensive gains (losses) before reclassifications 143 36  
Reclassifications to net income of previously deferred (gains) losses (28) (8)  
Total other comprehensive income (loss) 115 28  
Balance 269 154 126
Change in funded status of pension plans      
Accumulated other comprehensive income      
Balance (6,271) (5,796)  
Other comprehensive gains (losses) before reclassifications (1,278) (1,215)  
Reclassifications to net income of previously deferred (gains) losses 620 740  
Total other comprehensive income (loss) (658) (475)  
Adoption of ASU 2018-02 (1,388)    
Balance (8,317) (6,271) (5,796)
Foreign currency translation adjustment      
Accumulated other comprehensive income      
Balance (8,207) (6,666)  
Other comprehensive gains (losses) before reclassifications 3,163 (1,541)  
Total other comprehensive income (loss) 3,163 (1,541)  
Balance $ (5,044) $ (8,207) $ (6,666)