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Changes in Accumulated Other Comprehensive Income (Loss) by Component, Net of Tax (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2016	Jul. 31, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance			$ 1,137,227
Other comprehensive income (loss) before reclassifications	$ (13,071)	$ 2,289	(3,498)	$ 5,393
Amounts reclassified from accumulated other comprehensive income (loss)	9	39	22	42
Net current-period other comprehensive income (loss)	(13,062)	2,328	(3,476)	5,435
Ending Balance	1,245,018	1,231,248	1,245,018	1,231,248
Foreign Currency Translation
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(13,889)	(12,371)	(23,479)	(15,516)
Other comprehensive income (loss) before reclassifications	(13,066)	2,353	(3,476)	5,498
Net current-period other comprehensive income (loss)	(13,066)	2,353	(3,476)	5,498
Ending Balance	(26,955)	(10,018)	(26,955)	(10,018)
Unrealized Gains and (Losses) on available- for-Sale Securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	24	51	28	89
Other comprehensive income (loss) before reclassifications	(5)	(64)	(22)	(105)
Amounts reclassified from accumulated other comprehensive income (loss)	9	39	22	42
Net current-period other comprehensive income (loss)	4	(25)		(63)
Ending Balance	28	26	28	26
Accumulated Other Comprehensive Income (Loss)
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(13,865)	(12,320)	(23,451)	(15,427)
Ending Balance	$ (26,927)	$ (9,992)	$ (26,927)	$ (9,992)

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

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