Quarterly report pursuant to Section 13 or 15(d)

Supplemental Disclosures - Narrative (Details)

v3.20.2
Supplemental Disclosures - Narrative (Details) - USD ($)
shares in Thousands
9 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Mar. 31, 2020
Payments for Repurchase of Equity [Abstract]      
Repurchases of common stock $ 166,959,000 $ 45,414,000  
Investments in mutual funds 21,700,000    
Interest paid 1,200,000 2,300,000  
Income taxes paid $ 55,600,000 $ 45,900,000  
Restricted Stock Units (RSUs)      
Payments for Repurchase of Equity [Abstract]      
Granted (in shares) 300    
Vesting period 5 years    
Restricted Stock Units (RSUs) | Member of Board of Directors      
Payments for Repurchase of Equity [Abstract]      
Vesting period 1 year    
Common Stock      
Payments for Repurchase of Equity [Abstract]      
Common shares repurchased (in shares) 2,767 716  
Repurchases of common stock $ 167,000,000.0 $ 45,400,000  
Stock Repurchase Program, March 2020 | Common Stock      
Payments for Repurchase of Equity [Abstract]      
Stock repurchase programs, authorized amount     $ 200,000,000
Remaining authorized repurchase amount $ 150,000,000.0