Stock-Based Compensation and Stock Options - Stock Options Outstanding and Exercisable (Detail) - $ / shares	9 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Mar. 31, 2022
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Outstanding Options	590,074	575,263	651,857	756,462	706,728	723,876
Weighted Average Remaining Contractual Life	3 years 2 months 4 days
Outstanding Options – Weighted Average Exercise Price	$ 123.15	$ 116.31	$ 108.1	$ 102.25	$ 96.14	$ 84.55
Exercisable Options – Number of Exercisable Options	291,717
Exercisable Options – Weighted Average Exercise Price	$ 87.66
Range of Exercise Price, $33.16 to $79.49 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Price, lower limit	33.16
Range of Exercise Price, upper limit	$ 79.49
Number of Outstanding Options	158,365
Weighted Average Remaining Contractual Life	2 years 2 months 26 days
Outstanding Options – Weighted Average Exercise Price	$ 60.23
Exercisable Options – Number of Exercisable Options	148,439
Exercisable Options – Weighted Average Exercise Price	$ 59.51
Range of Exercise Price, $79.50 to $148.89 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Price, lower limit	79.5
Range of Exercise Price, upper limit	$ 148.89
Number of Outstanding Options	184,780
Weighted Average Remaining Contractual Life	2 years 5 months 4 days
Outstanding Options – Weighted Average Exercise Price	$ 104.96
Exercisable Options – Number of Exercisable Options	105,097
Exercisable Options – Weighted Average Exercise Price	$ 99.35
Range of Exercise Price, $148.90 to $189.02 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Price, lower limit	148.9
Range of Exercise Price, upper limit	$ 189.02
Number of Outstanding Options	152,285
Weighted Average Remaining Contractual Life	4 years 4 months 28 days
Outstanding Options – Weighted Average Exercise Price	$ 161.02
Exercisable Options – Number of Exercisable Options	30,412
Exercisable Options – Weighted Average Exercise Price	$ 156.83
Range of Exercise Price, $189.03 to $222.26 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Price, lower limit	189.03
Range of Exercise Price, upper limit	$ 222.26
Number of Outstanding Options	94,644
Weighted Average Remaining Contractual Life	4 years 3 months 7 days
Outstanding Options – Weighted Average Exercise Price	$ 203.08
Exercisable Options – Number of Exercisable Options	7,769
Exercisable Options – Weighted Average Exercise Price	$ 197.16