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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, 2020	Oct. 31, 2019	Oct. 31, 2020	Oct. 31, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	$ 1,350,593	$ 1,361,404	$ 1,455,355	$ 1,489,098
Other comprehensive income (loss) before reclassifications	(1,692)	7,590	(2,471)	(2,620)
Amounts reclassified from accumulated other comprehensive income (loss)	1	6	(419)	32
Total other comprehensive (loss) income	(1,691)	7,596	(2,890)	(2,588)
Ending Balance	1,431,319	1,429,853	1,431,319	1,429,853
Foreign Currency Translation
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(29,180)	(37,496)	(28,328)	(26,925)
Other comprehensive income (loss) before reclassifications	(1,693)	7,420	(2,545)	(3,151)
Total other comprehensive (loss) income	(1,693)	7,420	(2,545)	(3,151)
Ending Balance	(30,873)	(30,076)	(30,873)	(30,076)
Unrealized Gains and (Losses) on available- for-Sale Securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(23)	209	324	(178)
Other comprehensive income (loss) before reclassifications	1	170	74	531
Amounts reclassified from accumulated other comprehensive income (loss)	1	6	(419)	32
Total other comprehensive (loss) income	2	176	(345)	563
Ending Balance	(21)	385	(21)	385
Accumulated Other Comprehensive Loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(29,203)	(37,287)	(28,004)	(27,103)
Ending Balance	$ (30,894)	$ (29,691)	$ (30,894)	$ (29,691)

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