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Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss by Component, Net of Tax (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2025	Apr. 30, 2024
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	$ 2,471,504	$ 2,112,540
Net current-period other comprehensive income	(17,562)	5,600
Ending Balance	2,431,807	2,162,334
Foreign Currency Translation
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(46,474)	(38,376)
Other comprehensive income (loss) before reclassifications	16,064	(3,298)
Amounts reclassified from accumulated other comprehensive loss	0	0
Net current-period other comprehensive income	16,064	(3,298)
Ending Balance	(30,410)	(41,674)
Unrealized Gains and (Losses) on Available- for-Sale Securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(166)	(771)
Other comprehensive income (loss) before reclassifications	1,232	(2,279)
Amounts reclassified from accumulated other comprehensive loss	266	(23)
Net current-period other comprehensive income	1,498	(2,302)
Ending Balance	1,332	(3,073)
Accumulated Other Comprehensive Loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(46,640)	(39,147)
Other comprehensive income (loss) before reclassifications	17,296	(5,577)
Amounts reclassified from accumulated other comprehensive loss	266	(23)
Net current-period other comprehensive income	17,562	(5,600)
Ending Balance	$ (29,078)	$ (44,747)

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