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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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