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Stockholders' Equity (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Nov. 20, 2025
Jan. 31, 2024
Jan. 31, 2022
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Jan. 22, 2022
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Total unrecognized compensation cost related to non-vested stock-based compensation arrangements       $ 32,896      
Forfeiture rate, Board of Directors       0.00%      
Forfeiture rate, non-Board of Directors       7.40%      
Stock-based compensation expense, before tax       $ 31,674 $ 33,052 $ 23,958  
Unrecognized compensation cost is expected to be recognized over a weighted-average period       1 year 6 months 14 days      
Executive Separation and Release Agreement [Member]              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Stock-based compensation expense, before tax         $ 1,682 1,265  
2017 Plan [Member]              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Common Stock, Capital Shares Reserved for Future Issuance       5,031      
Restricted Stock Units (RSUs) [Member] | RSU Agreement prior to November 14, 2023 [Member]              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Vesting period, in years       4 years      
Vesting rate       25.00%      
Restricted Stock Units (RSUs) [Member] | RSUs Granted after November 14, 2023 [Member]              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Vesting period, in years       3 years      
Vesting rate       33.30%      
Stock Options [Member]              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Vesting period, in years       4 years      
Vested contractual term, in years       10 years      
Exercise prices of stock options outstanding       $ 91.25 $ 86.03    
Weighted-average exercise price       $ 191.45      
Stock Options [Member] | RSU Agreement prior to November 14, 2023 [Member]              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Vesting rate       25.00%      
Performance Restricted Stock Units [Member]              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Award performance period (in years)       3 years      
Performance based criteria plan payout percentage, target       100.00%      
Discount for dividends       0.00%      
Performance Restricted Stock Units [Member] | Maximum [Member]              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Performance based criteria plan payout percentage       150.00%      
Performance Restricted Stock Units [Member] | Minimum [Member]              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Performance based criteria plan payout percentage       0.00%      
2022 Authorization [Member] | Maximum [Member]              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Stock repurchase program authorized amount             $ 800,000
2022 Authorization [Member]              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Stock repurchase program authorized amount           $ 126,380  
Repurchase period in years     2 years        
Stock repurchase program, number of shares authorized to be repurchased           1,060,000  
2024 Authorization [Member]              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Stock repurchase program authorized amount   $ 600,000   $ 170,083 $ 390,819    
Repurchase period in years   3 years          
Stock repurchase program, number of shares authorized to be repurchased       864,000 2,236,000    
2025 Authorization [Member] | Subsequent Event [Member]              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Stock repurchase program authorized amount $ 600,000            
New stock repurchase program authorized amount $ 1,800,000            
Repurchase period in years 3 years