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Comprehensive Income - Changes in Each Component of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Apr. 30, 2021 | Apr. 30, 2020 | Apr. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning balance |  | $ 1,221,381 |  |
Ending balance |  | 1,366,389 | $ 1,221,381 |
Foreign Currency Translation |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning balance |  | (83,652) | (60,270) | $ (32,399)
Unrealized (losses) gains arising during the period |  | 49,986 | (23,382) | (27,871)
Ending balance |  | (33,666) | (83,652) | (60,270)
Deferred Compensation and Pension Plan |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning balance | [1] | (23,554) | (16,838) | (9,073)
Unrealized (losses) gains arising during the period | [1] | 2,660 | (8,883) | (6,461)
Reclassification of realized net losses (gains) to net income | [1] | 2,759 | 2,167 | 1,092
Effect of adoption of accounting standard | [1] |  |  | (2,396)
Ending balance | [1] | (18,135) | (23,554) | (16,838)
Unrealized Gains (Losses) on Marketable Securities |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning balance |  | 34 |  |
Unrealized (losses) gains arising during the period |  | (53) | 37 |
Reclassification of realized net losses (gains) to net income |  |  | (3) |
Ending balance |  | (19) | 34 |
Unrealized Gains on Interest Rate Swap |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning balance | [2] |  | 456 | 1,337
Unrealized (losses) gains arising during the period | [2] |  | (678) | (800)
Reclassification of realized net losses (gains) to net income | [2] |  | 222 | (280)
Effect of adoption of accounting standard | [2] |  |  | 199
Ending balance | [2] |  |  | 456
Accumulated Other Comprehensive Loss, Net |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning balance |  | (107,172) | (76,652) | (40,135)
Unrealized (losses) gains arising during the period |  | 52,593 | (32,906) | (35,132)
Reclassification of realized net losses (gains) to net income |  | 2,759 | 2,386 | 812
Effect of adoption of accounting standard |  |  |  | (2,197)
Ending balance |  | $ (51,820) | $ (107,172) | $ (76,652)
[1] | The tax effects on unrealized gains (losses) were $1.1 million, $(3.1) million and $(2.3) million as of April 30, 2021, 2020 and 2019, respectively. The tax effects on reclassifications of realized net losses were $1.0 million, $0.8 million and $0.4 million as of April 30, 2021, 2020 and 2019, respectively.
[2] | The tax effects on unrealized (losses) gains were $(0.2) million and $(0.3) million as of 2020 and 2019, respectively. The tax effects on the reclassification of realized net (losses) gains to net income was $(0.1) million and $0.1 million as of 2020 and 2019, respectively.

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- Definition Amount of increase (decrease) in accumulated other comprehensive income (AOCI) for reclassification to retained earnings of tax effect from remeasurement of deferred tax pursuant to Tax Cuts and Jobs Act. + References No definition available. + Details
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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(g)(1)(ii)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(31)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14064-108612 Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
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