v3.26.1
Comprehensive Income - Schedule of Changes in Each Component of Accumulated Other Comprehensive Loss, Net (Details) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 30, 2026
Apr. 30, 2025
Apr. 30, 2024
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance $ 1,872,139 $ 1,737,325 $ 1,653,005
Ending balance 1,978,903 1,872,139 1,737,325
Accumulated Other Comprehensive Loss      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (86,243) (107,671) (92,764)
Unrealized gains (losses) arising during the period 13,463 21,571 (15,233)
Reclassification of realized net (gains) losses to net income (47) (143) 326
Ending balance (72,827) (86,243) (107,671)
Foreign Currency Translation      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (93,904) (116,004) (96,860)
Unrealized gains (losses) arising during the period 12,386 22,100 (19,144)
Reclassification of realized net (gains) losses to net income 0 0 0
Ending balance (81,518) (93,904) (116,004)
Deferred Compensation and Pension Plan      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance 7,604 8,370 4,381
Unrealized gains (losses) arising during the period 1,162 (625) 3,663
Reclassification of realized net (gains) losses to net income (45) (141) 326
Ending balance 8,721 7,604 8,370
Tax effect on unrealized gains (losses), tax expense 300 (300) 1,300
Tax effect on reclassification net (gains) losses, tax benefit   (100) 100
Unrealized (Losses) Gains on Marketable Securities      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance 57 (37) (285)
Unrealized gains (losses) arising during the period (85) 96 248
Reclassification of realized net (gains) losses to net income (2) (2) 0
Ending balance $ (30) $ 57 (37)
Tax effect on unrealized gains, tax expense (benefit)     $ 100