Benefit Plans (Narrative) (Details)		3 Months Ended		12 Months Ended
	Oct. 15, 2018	Mar. 31, 2024 USD ($) quarter installment shares	Sep. 30, 2023 USD ($)	Mar. 31, 2024 USD ($) installment quarter plan $ / shares shares	Mar. 31, 2023 USD ($) $ / shares shares	Mar. 31, 2022 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	$ 1,700,000	$ 1,800,000
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		65
Stock Option Plans
Number of shares available for grant (in shares) | shares		242,540		242,540
Percentage of shares subject to performance shares				100.00%
Weighted-average fair value at the grant date (in dollars per share) | $ / shares				$ 69.00	$ 53.57	$ 99.14
Fair value of vested options				$ 2,466,706	$ 2,602,858	$ 2,376,824
Restricted Stock
Fair value of restricted stock vested in period				7,796,666	6,721,492	12,814,827
Schedule of vesting of restricted shares on basis of compounded annual EPS growth [Abstract]
Stock-based compensation				$ (1,683,087)	9,052,835	17,582,995
Stock Options Plans
Stock Option Plans
Shares of authorized common stock reserved for issuance (in shares) | shares		3,350,000		3,350,000
Compensation Cost Not yet Recognized
Total unrecognized stock-based compensation expense related to non-vested stock options		$ 400,000		$ 400,000
Weighted average period for recognition				1 year 2 months 12 days
Schedule of vesting of restricted shares on basis of compounded annual EPS growth [Abstract]
Weighted average period for recognition				1 year 2 months 12 days
Stock-based compensation				$ (3,754,209)	$ 2,442,309	$ 3,473,913
Outstanding number | shares		267,947		267,947	314,742
Stock Options Plans | Scenario 1
Schedule of vesting of restricted shares on basis of compounded annual EPS growth [Abstract]
Outstanding number | shares		41,103		41,103
Stock Options Plans | Scenario 2
Schedule of vesting of restricted shares on basis of compounded annual EPS growth [Abstract]
Outstanding number | shares		108,865		108,865
Stock Options Plans | Minimum
Stock Option Plans
Vesting period				3 years
Stock Options Plans | Maximum
Stock Option Plans
Expiration period				10 years
Vesting period				6 years
Restricted Stock
Compensation Cost Not yet Recognized
Weighted average period for recognition				7 months 6 days
Restricted Stock
Granted during the period (in shares) | shares				3,993	3,250	4,062
Granted during the period (in dollars per share) | $ / shares				$ 120.12	$ 129.85	$ 188.38
Schedule of vesting of restricted shares on basis of compounded annual EPS growth [Abstract]
Weighted average period for recognition				7 months 6 days
Stock-based compensation				$ 2,071,122	$ 6,610,526	$ 14,109,082
Unrecognized compensation cost related to unvested restricted stock		$ 1,400,000		$ 1,400,000
Restricted Stock | Minimum
Stock Option Plans
Number of installments | installment		3		3
Restricted Stock | Maximum
Stock Option Plans
Number of installments | installment		6		6
Service Options
Stock Option Plans
Vesting period				10 years
Number of installments | installment		3		3
Performance Shares
Stock Option Plans
Vesting period	10 years
Number of consecutive quarters | quarter		4		4
Schedule of vesting of restricted shares on basis of compounded annual EPS growth [Abstract]
Stock based compensation expense			$ 4,900,000
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		$ 5,500,000		$ 5,500,000	$ 5,700,000