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Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss by Component, Net of Tax (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2025	Oct. 31, 2024	Oct. 31, 2025	Oct. 31, 2024
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	$ 2,580,392	$ 2,241,433	$ 2,471,504	$ 2,112,540
Net current-period other comprehensive income	(146)	(1,050)	(15,151)	(1,765)
Ending Balance	2,704,112	2,352,923	2,704,112	2,352,923
Foreign Currency Translation
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(31,720)	(37,914)	(46,474)	(38,376)
Other comprehensive income (loss) before reclassifications	(1,237)	671	13,517	1,133
Amounts reclassified from accumulated other comprehensive loss	0	0	0	0
Net current-period other comprehensive income	(1,237)	671	13,517	1,133
Ending Balance	(32,957)	(37,243)	(32,957)	(37,243)
Unrealized Gains and (Losses) on Available- for-Sale Securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	85	(518)	(166)	(771)
Other comprehensive income (loss) before reclassifications	1,377	396	1,355	728
Amounts reclassified from accumulated other comprehensive loss	6	(17)	279	(96)
Net current-period other comprehensive income	1,383	379	1,634	632
Ending Balance	1,468	(139)	1,468	(139)
Accumulated Other Comprehensive Loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(31,635)	(38,432)	(46,640)	(39,147)
Other comprehensive income (loss) before reclassifications	140	1,067	14,872	1,861
Amounts reclassified from accumulated other comprehensive loss	6	(17)	279	(96)
Net current-period other comprehensive income	146	1,050	15,151	1,765
Ending Balance	$ (31,489)	$ (37,382)	$ (31,489)	$ (37,382)

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