Employee Benefits and Stock-based Compensation - Stock Option Activities (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Jan. 31, 2023	Jan. 31, 2022	Jan. 31, 2021
Share-Based Payment Arrangement [Abstract]
Shares, Outstanding	619,322	719,143	1,124,646
Shares, Granted		14,700	51,200
Shares, Assumed		163,581
Shares, Exercised	(121,624)	(269,287)	(421,736)
Shares, Forfeited	(10,618)	(7,669)	(11,618)
Shares, Expired	(2,289)	(1,146)	(23,349)
Shares, Outstanding	484,791	619,322	719,143
Shares, Exercisable	370,158
Weighted-Average Exercise Price, Outstanding	$ 40.08	$ 38.33	$ 32.93
Weighted-Average Exercise Price, Granted		110.19	59.54
Weighted-Average Exercise Price, Assumed		23.10
Weighted-Average Exercise Price, Exercised	30.34	28.23	24.52
Weighted-Average Exercise Price, Forfeited	55.97	68.95	46.69
Weighted-Average Exercise Price, Expired	39.19	9.86	70.11
Weighted-Average Exercise Price, Outstanding	42.18	40.08	38.33
Weighted-Average Exercise Price, Exercisable	$ 44.47
Weighted-Average Grant-date Fair Value, Granted		50.28	$ 28.37
Weighted-Average Acquisition-date Fair Value, Assumed		$ 173.04
Total Intrinsic Value of options Exercised	$ 6,712	$ 25,622	$ 19,401
Weighted-Average Remaining Contractual Term, Outstanding	4 years 4 months 17 days
Weighted-Average Remaining Contractual Term, Exercisable	3 years 7 months 2 days
Aggregate Intrinsic Value, Outstanding	$ 23,346
Aggregate Intrinsic Value, Exercisable	$ 16,927