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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		6 Months Ended
	Jul. 31, 2024	Jul. 31, 2023	Jul. 31, 2024	Jul. 31, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	$ 2,162,334	$ 1,850,682	$ 2,112,540	$ 1,792,683
Net current-period other comprehensive income	(6,315)	(4,536)	(715)	(9,833)
Ending Balance	2,241,433	1,967,391	2,241,433	1,967,391
Foreign Currency Translation
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(41,674)	(39,647)	(38,376)	(42,824)
Other comprehensive income before reclassifications	3,760	4,515	462	7,692
Amounts reclassified from accumulated other comprehensive income	0	0	0	0
Net current-period other comprehensive income	(3,760)	(4,515)	(462)	(7,692)
Ending Balance	(37,914)	(35,132)	(37,914)	(35,132)
Unrealized Gains and (Losses) on available- for-Sale Securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(3,073)	(3,691)	(771)	(5,811)
Other comprehensive income before reclassifications	2,611	28	332	2,147
Amounts reclassified from accumulated other comprehensive income	(56)	(7)	(79)	(6)
Net current-period other comprehensive income	(2,555)	(21)	(253)	(2,141)
Ending Balance	(518)	(3,670)	(518)	(3,670)
Accumulated Other Comprehensive Loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(44,747)	(43,338)	(39,147)	(48,635)
Other comprehensive income before reclassifications	6,371	4,543	794	9,839
Amounts reclassified from accumulated other comprehensive income	(56)	(7)	(79)	(6)
Net current-period other comprehensive income	(6,315)	(4,536)	(715)	(9,833)
Ending Balance	$ (38,432)	$ (38,802)	$ (38,432)	$ (38,802)

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