Stock-Based Compensation and Stock Options - Stock Options Outstanding and Exercisable (Detail) - $ / shares	9 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Mar. 31, 2021
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Outstanding Options	756,462	706,728	723,876	796,858	778,982	937,158
Weighted Average Remaining Contractual Life	3 years 3 months 25 days
Outstanding Options – Weighted Average Exercise Price	$ 102.25	$ 96.14	$ 84.55	$ 80.27	$ 72.17	$ 64.28
Exercisable Options – Number of Exercisable Options	337,559
Exercisable Options – Weighted Average Exercise Price	$ 70.05
Range of Exercise Price, $33.16 to $59.32 [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	$ 70.24
Number of Outstanding Options	204,302
Weighted Average Remaining Contractual Life	2 years 1 month 2 days
Outstanding Options – Weighted Average Exercise Price	$ 52.49
Exercisable Options – Number of Exercisable Options	187,542
Exercisable Options – Weighted Average Exercise Price	$ 52.17
Range of Exercise Price, $59.33 to 87.49 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Price, lower limit	70.25
Range of Exercise Price, upper limit	$ 87.69
Number of Outstanding Options	248,327
Weighted Average Remaining Contractual Life	2 years 11 months 1 day
Outstanding Options – Weighted Average Exercise Price	$ 83.32
Exercisable Options – Number of Exercisable Options	111,749
Exercisable Options – Weighted Average Exercise Price	$ 82.64
Range of Exercise Price, $87.50 to $148.89 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Price, lower limit	87.70
Range of Exercise Price, upper limit	$ 155.99
Number of Outstanding Options	209,534
Weighted Average Remaining Contractual Life	4 years 3 months 18 days
Outstanding Options – Weighted Average Exercise Price	$ 138.56
Exercisable Options – Number of Exercisable Options	30,938
Exercisable Options – Weighted Average Exercise Price	$ 108.20
Range of Exercise Price, $148.90 to $197.16 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Price, lower limit	156.00
Range of Exercise Price, upper limit	$ 197.16
Number of Outstanding Options	94,299
Weighted Average Remaining Contractual Life	4 years 10 months 6 days
Outstanding Options – Weighted Average Exercise Price	$ 179.20
Exercisable Options – Number of Exercisable Options	7,330
Exercisable Options – Weighted Average Exercise Price	$ 174.40