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Changes in Accumulated Other Comprehensive Income (Loss) by Component, Net of Tax (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2016	Oct. 31, 2015	Oct. 31, 2016	Oct. 31, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance			$ 1,137,227
Other comprehensive income (loss) before reclassifications	$ (10,624)	$ (2,670)	(14,122)	$ 2,723
Amounts reclassified from accumulated other comprehensive income (loss)	(96)	11	(74)	53
Net current-period other comprehensive income (loss)	(10,720)	(2,659)	(14,196)	2,776
Ending Balance	1,247,633	1,171,669	1,247,633	1,171,669
Foreign Currency Translation
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(26,955)	(10,018)	(23,479)	(15,516)
Other comprehensive income (loss) before reclassifications	(10,665)	(2,688)	(14,141)	2,810
Net current-period other comprehensive income (loss)	(10,665)	(2,688)	(14,141)	2,810
Ending Balance	(37,620)	(12,706)	(37,620)	(12,706)
Unrealized Gains and (Losses) on available- for-Sale Securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	28	26	28	89
Other comprehensive income (loss) before reclassifications	41	18	19	(87)
Amounts reclassified from accumulated other comprehensive income (loss)	(96)	11	(74)	53
Net current-period other comprehensive income (loss)	(55)	29	(55)	(34)
Ending Balance	(27)	55	(27)	55
Accumulated Other Comprehensive Income (Loss)
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(26,927)	(9,992)	(23,451)	(15,427)
Ending Balance	$ (37,647)	$ (12,651)	$ (37,647)	$ (12,651)

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Amount after tax, before reclassification adjustments, of other comprehensive income (loss), attributable to parent.

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