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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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