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Changes in Accumulated Other Comprehensive Loss by Component, Net of Tax (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	$ 1,455,355	$ 1,489,098	$ 1,300,903
Other comprehensive income (loss) before reclassifications	11,303	(940)
Amounts reclassified from accumulated other comprehensive income (loss)	(419)	39
Total other comprehensive income (loss)	10,884	(901)	(16,452)
Ending Balance	1,477,358	1,455,355	1,489,098
Foreign Currency Translation
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(28,328)	(26,925)
Other comprehensive income (loss) before reclassifications	11,378	(1,403)
Total other comprehensive income (loss)	11,378	(1,403)
Ending Balance	(16,950)	(28,328)	(26,925)
Unrealized Gains and (Losses) on available- for-Sale Securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	324	(178)
Other comprehensive income (loss) before reclassifications	(75)	463
Amounts reclassified from accumulated other comprehensive income (loss)	(419)	39
Total other comprehensive income (loss)	(494)	502
Ending Balance	(170)	324	(178)
Accumulated Other Comprehensive Loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(28,004)	(27,103)	(10,651)
Ending Balance	$ (17,120)	$ (28,004)	$ (27,103)

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