v3.26.1
Benefit Plans - Narrative (Details)
 3 Months Ended 12 Months Ended
Jan. 21, 2026
shares
Dec. 31, 2025
shares
Jun. 10, 2025
Apr. 25, 2025
$ / shares
shares
Dec. 18, 2024
Mar. 31, 2026
USD ($)
yr
$ / shares
shares
Dec. 31, 2025
$ / shares
shares
Sep. 30, 2025
$ / shares
Jun. 30, 2025
$ / shares
Mar. 31, 2025
USD ($)
$ / shares
shares
Dec. 31, 2024
$ / shares
Sep. 30, 2024
USD ($)
$ / shares
Jun. 30, 2024
$ / shares
Sep. 30, 2023
USD ($)
Mar. 31, 2026
USD ($)
plan
$ / shares
shares
Mar. 31, 2025
USD ($)
$ / shares
shares
Mar. 31, 2024
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Maximum contribution from employer                             50.00%    
Employer matching contribution, percent                             6.00%    
Employer contribution, percent of match                             3.00%    
Amount of cost recognized | $                             $ 1,500,000 $ 1,600,000 $ 1,500,000
Number of executive retirement plans | plan                             2    
Annual salary increase used for estimating unfunded liability           3.50%                      
Discount rate used for estimating unfunded liability           6.00%                 6.00%    
Retirement age used for estimating unfunded liability | yr           65                      
Stock Option Plans                                  
Diluted (in dollars per share) | $ / shares           $ 7.44 $ (0.13) $ (0.33) $ 0.30 $ 7.91 $ 2.49 $ 4.03 $ 1.82   $ 6.88 $ 16.21 $ 13.14
Weighted-average fair value at the grant date (in dollars per share) | $ / shares                             $ 86.69 58.73 $ 69.00
2017 Plan                                  
Stock Option Plans                                  
Number of shares available for grant (in shares)           698,117                 698,117    
2025 Plan                                  
Stock Option Plans                                  
Number of shares available for grant (in shares)           0                 0    
2008 and 2011 Plan                                  
Stock Option Plans                                  
Number of shares available for grant (in shares)           0                 0    
Target 2                                  
Stock Option Plans                                  
Vesting percentage (in hundredths)                             60.00%    
Schedule of vesting of restricted shares on basis of compounded annual EPS growth [Abstract]                                  
EPS Targets (in dollars per share) | $ / shares                       $ 20.45     $ 20.45    
Target 3                                  
Stock Option Plans                                  
Vesting percentage (in hundredths)                             100.00%    
Schedule of vesting of restricted shares on basis of compounded annual EPS growth [Abstract]                                  
EPS Targets (in dollars per share) | $ / shares                             $ 18.40    
Target 1                                  
Stock Option Plans                                  
Vesting percentage (in hundredths)                             40.00%    
Vested (in shares)       88,497                          
Schedule of vesting of restricted shares on basis of compounded annual EPS growth [Abstract]                                  
EPS Targets (in dollars per share) | $ / shares       $ 16.35                     $ 16.35 $ 16.35  
Forfeited during the period (in shares)                               34,415  
Target 4                                  
Schedule of vesting of restricted shares on basis of compounded annual EPS growth [Abstract]                                  
Performance target, earnings per share target | $ / shares                             $ 25.30    
Stock Options                                  
Stock Option Plans                                  
Shares of authorized common stock reserved for issuance (in shares)           3,750,000                 3,750,000    
Fair value of vested options | $                             $ 733,598 $ 2,193,533 $ 2,466,706
Compensation Cost Not yet Recognized                                  
Total unrecognized stock-based compensation expense related to non-vested stock options | $           $ 600,000                 $ 600,000    
Weighted average period for recognition                             1 year 7 months 6 days    
Schedule of vesting of restricted shares on basis of compounded annual EPS growth [Abstract]                                  
Weighted average period for recognition                             1 year 7 months 6 days    
Stock-based compensation | $                             $ 1,017,145 $ 607,275 $ (3,754,209)
Outstanding number           134,809       169,154         134,809 169,154  
Stock Options | Scenario 1                                  
Schedule of vesting of restricted shares on basis of compounded annual EPS growth [Abstract]                                  
Outstanding number           9,450                 9,450    
Stock Options | Scenario 2                                  
Schedule of vesting of restricted shares on basis of compounded annual EPS growth [Abstract]                                  
Outstanding number           12,587                 12,587    
Stock Options | Maximum                                  
Stock Option Plans                                  
Expiration period                             10 years    
Restricted Stock                                  
Compensation Cost Not yet Recognized                                  
Weighted average period for recognition                             1 year 6 months    
Restricted Stock                                  
Granted during the period (in shares)                             183,500 71,186 3,993
Granted during the period (in dollars per share) | $ / shares                             $ 156.72 $ 111.64 $ 120.12
Schedule of vesting of restricted shares on basis of compounded annual EPS growth [Abstract]                                  
Weighted average period for recognition                             1 year 6 months    
Stock-based compensation | $                             $ 18,325,357 $ (20,296,243) $ 2,071,122
Fair value of restricted stock vested in period | $                             23,271,732 $ 7,293,854 7,796,666
Unrecognized compensation cost related to unvested restricted stock | $           $ 15,600,000                 $ 15,600,000    
Forfeited during the period (in shares)                             4,031    
Vested during the period (in shares)                             166,652    
Outstanding (in shares)           172,500       159,683         172,500 159,683  
Restricted Stock | 2024 Long-term Incentive Program and Non-Employee Director Awards                                  
Stock Option Plans                                  
Percentage of shares subject to performance shares     100.00%   100.00%                        
Schedule of vesting of restricted shares on basis of compounded annual EPS growth [Abstract]                                  
Forfeited during the period (in shares)   1,031                              
Vested during the period (in shares) 6,469                                
Outstanding (in shares)   7,500         7,500                    
Performance Shares                                  
Stock Option Plans                                  
Percentage of shares subject to performance shares       72.00%                          
Percentage of shares forfeit                               28.00%  
Share based compensation expense (reversal) | $                       $ (18,500,000)   $ (4,900,000)   $ (3,500,000)  
Diluted (in dollars per share) | $ / shares                               $ 16.36  
Performance Shares | 2024 Long-term Incentive Program and Non-Employee Director Awards                                  
Stock Option Plans                                  
Percentage of shares subject to performance shares         100.00%                        
Schedule of vesting of restricted shares on basis of compounded annual EPS growth [Abstract]                                  
Forfeited during the period (in shares)   6,132                              
Vested during the period (in shares) 17,368                                
Outstanding (in shares)   23,500         23,500                    
Supplemental Employee Retirement Plans, Defined Benefit                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Pension and other postretirement benefits cost (reversal of cost) | $                             $ 500,000 $ 500,000 $ 500,000
Unfunded liability | $           $ 5,100,000       $ 5,300,000         $ 5,100,000 $ 5,300,000