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Changes in Accumulated Other Comprehensive Loss by Component, Net of Tax (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2021	Oct. 31, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	$ 1,669,420	$ 1,350,593	$ 1,477,358	$ 1,455,355
Other comprehensive income (loss) before reclassifications	(3,643)	(1,692)	385	(2,471)
Amounts reclassified from accumulated other comprehensive income (loss)	9	1	13	(419)
Total other comprehensive income (loss)	(3,634)	(1,691)	398	(2,890)
Ending Balance	1,746,731	1,431,319	1,746,731	1,431,319
Foreign Currency Translation
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(12,922)	(29,180)	(16,950)	(28,328)
Other comprehensive income (loss) before reclassifications	(2,605)	(1,693)	1,423	(2,545)
Total other comprehensive income (loss)	(2,605)	(1,693)	1,423	(2,545)
Ending Balance	(15,527)	(30,873)	(15,527)	(30,873)
Unrealized Gains and (Losses) on available- for-Sale Securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(166)	(23)	(170)	324
Other comprehensive income (loss) before reclassifications	(1,038)	1	(1,038)	74
Amounts reclassified from accumulated other comprehensive income (loss)	9	1	13	(419)
Total other comprehensive income (loss)	(1,029)	2	(1,025)	(345)
Ending Balance	(1,195)	(21)	(1,195)	(21)
Accumulated Other Comprehensive Loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(13,088)	(29,203)	(17,120)	(28,004)
Ending Balance	$ (16,722)	$ (30,894)	$ (16,722)	$ (30,894)

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