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Changes in Accumulated Other Comprehensive Loss by Component, Net of Tax (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2020	Jul. 31, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	$ 1,298,108	$ 1,447,971	$ 1,455,355	$ 1,489,098
Other comprehensive income (loss) before reclassifications	11,688	(6,589)	(779)	(10,210)
Amounts reclassified from accumulated other comprehensive income (loss)	34	19	(420)	26
Total other comprehensive income (loss)	11,722	(6,570)	(1,199)	(10,184)
Ending Balance	1,350,593	1,361,404	1,350,593	1,361,404
Foreign Currency Translation
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(40,945)	(30,725)	(28,328)	(26,925)
Other comprehensive income (loss) before reclassifications	11,765	(6,771)	(852)	(10,571)
Total other comprehensive income (loss)	11,765	(6,771)	(852)	(10,571)
Ending Balance	(29,180)	(37,496)	(29,180)	(37,496)
Unrealized Gains and (Losses) on available- for-Sale Securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	20	8	324	(178)
Other comprehensive income (loss) before reclassifications	(77)	182	73	361
Amounts reclassified from accumulated other comprehensive income (loss)	34	19	(420)	26
Total other comprehensive income (loss)	(43)	201	(347)	387
Ending Balance	(23)	209	(23)	209
Accumulated Other Comprehensive Loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(40,925)	(30,717)	(28,004)	(27,103)
Ending Balance	$ (29,203)	$ (37,287)	$ (29,203)	$ (37,287)

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