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Stock-Based Compensation (Tables)
 12 Months Ended
Mar. 31, 2023
Share-Based Payment Arrangement [Abstract]  
Schedule of Nonvested Stock Units Activity
Annual award activity recorded in the consolidated statements of comprehensive income were as follows:
Number of
Shares		Weighted-
Average
Grant-Date
Fair Value
Nonvested, March 31, 2020162,349 $124.47 
Granted47,015 220.31 
Vested*(92,614)(104.92)
Forfeited(3,664)(147.34)
Nonvested, March 31, 2021113,086 179.58 
Granted52,256 363.89 
Vested*(60,034)(162.37)
Forfeited(7,441)(239.39)
Nonvested, March 31, 202297,867 284.00 
Granted51,955 338.99 
Vested*(45,092)(249.67)
Forfeited(15,439)(299.96)
Nonvested, March 31, 202389,291 $330.57 

* The amounts vested include shares withheld to cover taxes that are not issued to the recipient.
LTIP PSUs activity recorded in the consolidated statements of comprehensive income were as follows:

Number of
Shares		Weighted-
Average
Grant-Date
Fair Value
Nonvested, March 31, 2020153,446 $133.53 
Granted*39,780 376.45 
Vested**(77,098)(106.37)
Nonvested, March 31, 2021116,128 215.30 
Granted*69,644 358.75 
Vested**(69,816)(131.33)
Forfeited(12,924)(239.81)
Nonvested, March 31, 2022103,032 344.25 
Granted*65,470 330.70 
Vested**(30,104)(319.81)
Forfeited(27,194)(323.92)
Nonvested, March 31, 2023111,204 $347.86 

*The amounts granted are the maximum amounts under the terms of the applicable LTIP PSUs.
** The amounts vested include shares withheld to cover taxes that are not issued to the recipient.
Schedule of LTIP Option Activity
LTIP option activity recorded in the consolidated statements of comprehensive income were as follows:
Number of
Shares		Weighted-
Average
Grant-Date
Fair Value		Weighted-
Average
Remaining
Contractual
Term
(Years)		Aggregate
Intrinsic
Value
Vested, March 31, 2020302,939 $66.02 5.0$20,594 
Exercised(107,197)(63.20)
Vested, March 31, 2021195,742 67.56 3.651,452 
Exercised(45,810)(67.11)
Number of
Shares		Weighted-
Average
Grant-Date
Fair Value		Weighted-
Average
Remaining
Contractual
Term
(Years)		Aggregate
Intrinsic
Value
Vested, March 31, 2022149,932 67.70 2.630,896 
Exercised*(64,043)(68.66)
Vested, March 31, 202385,889 $66.99 1.8$33,037 
*The amounts exercised include shares withheld to cover taxes that are not issued to the recipient.
Schedule of Stock Compensation Expense Components of stock-based compensation recorded in the consolidated statements of comprehensive income were as follows:
Years Ended March 31,
202320222021
Stock-based compensation
RSUs$13,249 $12,093 $7,820 
PSUs— — 1,900 
LTIP PSUs11,275 12,865 11,555 
Grants to Directors1,863 1,507 1,195 
Subtotal26,387 26,465 22,470 
Other stock-based compensation
Employee Stock Purchase Plan510 351 231 
Total stock-based compensation, pre-tax26,897 26,816 22,701 
Income tax benefit (6,557)(6,496)(5,441)
Total stock-based compensation, net of tax$20,340 $20,320 $17,260 
Schedule of Unrecognized Compensation Expense Total remaining unrecognized stock-based compensation as of March 31, 2023, related to non-vested awards that the Company considers probable to vest and the weighted-average period over which the cost is expected to be recognized in future periods, are as follows:
Unrecognized
Stock-based Compensation		Weighted-Average
Remaining
Vesting Period (Years)
RSUs$14,829 1.1
LTIP PSUs15,891 1.6
Total$30,720