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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, 2017	Jul. 31, 2016	Jul. 31, 2017	Jul. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance			$ 1,313,084
Other comprehensive income (loss) before reclassifications	$ 8,949	$ (13,071)	10,735	$ (3,498)
Amounts reclassified from accumulated other comprehensive income (loss)	(23)	9	(9)	22
Total other comprehensive income (loss)	8,926	(13,062)	10,726	(3,476)
Ending Balance	1,308,813	1,245,018	1,308,813	1,245,018
Foreign Currency Translation
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(32,224)	(13,889)	(34,012)	(23,479)
Other comprehensive income (loss) before reclassifications	8,942	(13,066)	10,730	(3,476)
Total other comprehensive income (loss)	8,942	(13,066)	10,730	(3,476)
Ending Balance	(23,282)	(26,955)	(23,282)	(26,955)
Unrealized Gains and (Losses) on available- for-Sale Securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(45)	24	(57)	28
Other comprehensive income (loss) before reclassifications	7	(5)	5	(22)
Amounts reclassified from accumulated other comprehensive income (loss)	(23)	9	(9)	22
Total other comprehensive income (loss)	(16)	4	(4)
Ending Balance	(61)	28	(61)	28
Accumulated Other Comprehensive Income (Loss)
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(32,269)	(13,865)	(34,069)	(23,451)
Ending Balance	$ (23,343)	$ (26,927)	$ (23,343)	$ (26,927)

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

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