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Other Comprehensive Income and Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss by Component, Net of Tax (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2024	Oct. 31, 2023	Oct. 31, 2024	Oct. 31, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	$ 2,241,433	$ 1,967,391	$ 2,112,540	$ 1,792,683
Net current-period other comprehensive income	(1,050)	11,367	(1,765)	1,534
Ending Balance	2,352,923	2,046,558	2,352,923	2,046,558
Foreign Currency Translation
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(37,914)	(35,132)	(38,376)	(42,824)
Other comprehensive income before reclassifications	671	(11,961)	1,133	(4,269)
Amounts reclassified from accumulated other comprehensive loss	0	0	0	0
Net current-period other comprehensive income	671	(11,961)	1,133	(4,269)
Ending Balance	(37,243)	(47,093)	(37,243)	(47,093)
Unrealized Gains and (Losses) on Available- for-Sale Securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(518)	(3,670)	(771)	(5,811)
Other comprehensive income before reclassifications	396	592	728	2,739
Amounts reclassified from accumulated other comprehensive loss	(17)	2	(96)	(4)
Net current-period other comprehensive income	379	594	632	2,735
Ending Balance	(139)	(3,076)	(139)	(3,076)
Accumulated Other Comprehensive Loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(38,432)	(38,802)	(39,147)	(48,635)
Other comprehensive income before reclassifications	1,067	(11,369)	1,861	(1,530)
Amounts reclassified from accumulated other comprehensive loss	(17)	2	(96)	(4)
Net current-period other comprehensive income	1,050	(11,367)	1,765	(1,534)
Ending Balance	$ (37,382)	$ (50,169)	$ (37,382)	$ (50,169)

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