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Changes in Accumulated Other Comprehensive Loss by Component, Net of Tax (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	$ 1,477,358	$ 1,455,355	$ 1,489,098
Other comprehensive income (loss) before reclassifications	(7,721)	11,303
Amounts reclassified from accumulated other comprehensive income (loss)	11	(419)
Total other comprehensive (loss) income	(7,710)	10,884	(901)
Ending Balance	1,745,740	1,477,358	1,455,355
Foreign Currency Translation
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(16,950)	(28,328)
Other comprehensive income (loss) before reclassifications	(5,254)	11,378
Total other comprehensive (loss) income	(5,254)	11,378
Ending Balance	(22,204)	(16,950)	(28,328)
Unrealized Gains and (Losses) on available- for-Sale Securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(170)	324
Other comprehensive income (loss) before reclassifications	(2,467)	(75)
Amounts reclassified from accumulated other comprehensive income (loss)	11	(419)
Total other comprehensive (loss) income	(2,456)	(494)
Ending Balance	(2,626)	(170)	324
Accumulated Other Comprehensive Loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(17,120)	(28,004)	(27,103)
Ending Balance	$ (24,830)	$ (17,120)	$ (28,004)

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