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Comprehensive Income (Loss) - Changes in Each Component of Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Thousands

3 Months Ended

6 Months Ended

Oct. 31, 2021

Oct. 31, 2020

Oct. 31, 2021

Oct. 31, 2020

Accumulated Other Comprehensive Income Loss [Line Items]

Beginning balance

$ 1,366,389

Ending balance

$ 1,479,523

1,479,523

Foreign Currency Translation

Accumulated Other Comprehensive Income Loss [Line Items]

Beginning balance

(42,034)

$ (58,705)

(33,666)

$ (83,652)

Unrealized (losses) gains arising during the period

(7,017)

(2,721)

(15,385)

22,226

Ending balance

(49,051)

(61,426)

(49,051)

(61,426)

Deferred Compensation and Pension Plan

Accumulated Other Comprehensive Income Loss [Line Items]

Beginning balance

(17,794)

^[1]

(22,912)

^[2]

(18,135)

^[1]

(23,554)

^[2]

Unrealized (losses) gains arising during the period

^[1]

15

15

Reclassification of realized net losses to net income

336

^[1]

683

^[2]

677

^[1]

1,325

^[2]

Ending balance

(17,443)

^[1]

(22,229)

^[2]

(17,443)

^[1]

(22,229)

^[2]

Unrealized Gains (Losses) on Marketable Securities

Accumulated Other Comprehensive Income Loss [Line Items]

Beginning balance

(15)

25

(19)

34

Unrealized (losses) gains arising during the period

(21)

(25)

(18)

(34)

Reclassification of realized net losses to net income

1

Ending balance

(36)

(36)

Accumulated Other Comprehensive Loss

Accumulated Other Comprehensive Income Loss [Line Items]

Beginning balance

(59,843)

(81,592)

(51,820)

(107,172)

Unrealized (losses) gains arising during the period

(7,023)

(2,746)

(15,388)

22,192

Reclassification of realized net losses to net income

336

683

678

1,325

Ending balance

$ (66,530)

$ (83,655)

$ (66,530)

$ (83,655)

[1]	The tax effect on the reclassifications of realized net losses was $0.1 million and $0.2 million for the three and six months ended October 31, 2021
[2]	The tax effect on the reclassifications of realized net losses was $0.2 million and $0.5 million for the three and six months ended October 31, 2020

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