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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, 2022	Oct. 31, 2021	Oct. 31, 2022	Oct. 31, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	$ 1,707,192	$ 1,669,420	$ 1,745,740	$ 1,477,358
Other comprehensive income (loss) before reclassifications	(12,751)	(3,643)	(37,772)	385
Amounts reclassified from accumulated other comprehensive income (loss)	(1,131)	9	(1,465)	13
Total other comprehensive (loss) income	(13,882)	(3,634)	(39,237)	398
Ending Balance	1,738,391	1,746,731	1,738,391	1,746,731
Foreign Currency Translation
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(42,836)	(12,922)	(22,204)	(16,950)
Other comprehensive income (loss) before reclassifications	(13,451)	(2,605)	(34,083)	1,423
Amounts reclassified from accumulated other comprehensive income (loss)	0	0	0	0
Total other comprehensive (loss) income	(13,451)	(2,605)	(34,083)	1,423
Ending Balance	(56,287)	(15,527)	(56,287)	(15,527)
Unrealized Gains and (Losses) on available- for-Sale Securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(7,349)	(166)	(2,626)	(170)
Other comprehensive income (loss) before reclassifications	700	(1,038)	(3,689)	(1,038)
Amounts reclassified from accumulated other comprehensive income (loss)	(1,131)	9	(1,465)	13
Total other comprehensive (loss) income	(431)	(1,029)	(5,154)	(1,025)
Ending Balance	(7,780)	(1,195)	(7,780)	(1,195)
Accumulated Other Comprehensive Loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(50,185)	(13,088)	(24,830)	(17,120)
Ending Balance	$ (64,067)	$ (16,722)	$ (64,067)	$ (16,722)

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