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Changes in Accumulated Other Comprehensive Loss by Component, Net of Tax (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	$ 1,489,098	$ 1,300,903	$ 1,313,084
Other comprehensive income (loss) before reclassifications	(940)	(16,430)
Amounts reclassified from accumulated other comprehensive income (loss)	39	(22)
Total other comprehensive (loss) income	(901)	(16,452)	23,418
Ending Balance	1,455,355	1,489,098	1,300,903
Foreign Currency Translation
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(26,925)	(10,340)
Other comprehensive income (loss) before reclassifications	(1,403)	(16,585)
Total other comprehensive (loss) income	(1,403)	(16,585)
Ending Balance	(28,328)	(26,925)	(10,340)
Unrealized Gains and (Losses) on available- for-Sale Securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(178)	(311)
Other comprehensive income (loss) before reclassifications	463	155
Amounts reclassified from accumulated other comprehensive income (loss)	39	(22)
Total other comprehensive (loss) income	502	133
Ending Balance	324	(178)	(311)
Accumulated Other Comprehensive Loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(27,103)	(10,651)	(34,069)
Ending Balance	$ (28,004)	$ (27,103)	$ (10,651)

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