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Changes in Accumulated Other Comprehensive Loss by Component, Net of Tax (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 31, 2023
Jul. 31, 2022
Jul. 31, 2023
Jul. 31, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Beginning Balance $ 1,850,682 $ 1,695,921 $ 1,792,683 $ 1,745,740
Total other comprehensive (loss) income 4,536 (5,589) 9,833 (25,355)
Ending Balance 1,967,391 1,707,192 1,967,391 1,707,192
Foreign Currency Translation        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Beginning Balance (39,647) (36,593) (42,824) (22,204)
Other comprehensive income (loss) before reclassifications 4,515 (6,243) 7,692 (20,632)
Amounts reclassified from accumulated other comprehensive income (loss) 0 0 0 0
Total other comprehensive (loss) income 4,515 (6,243) 7,692 (20,632)
Ending Balance (35,132) (42,836) (35,132) (42,836)
Unrealized Gains and (Losses) on available- for-Sale Securities        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Beginning Balance (3,691) (8,003) (5,811) (2,626)
Other comprehensive income (loss) before reclassifications 28 876 2,147 (4,389)
Amounts reclassified from accumulated other comprehensive income (loss) (7) (222) (6) (334)
Total other comprehensive (loss) income 21 654 2,141 (4,723)
Ending Balance (3,670) (7,349) (3,670) (7,349)
Accumulated Other Comprehensive Loss        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Beginning Balance (43,338) (44,596) (48,635) (24,830)
Other comprehensive income (loss) before reclassifications 4,543 (5,367) 9,839 (25,021)
Amounts reclassified from accumulated other comprehensive income (loss) (7) (222) (6) (334)
Total other comprehensive (loss) income 4,536 (5,589) 9,833 (25,355)
Ending Balance $ (38,802) $ (50,185) $ (38,802) $ (50,185)