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Stock-Based Compensation, Performance-Based and Other Restricted Stock Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
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Apr. 30, 2021 | Apr. 30, 2020 | Apr. 30, 2019 | Apr. 30, 2018 | Apr. 30, 2017 | Apr. 30, 2016 | Apr. 30, 2015
Restricted Stock, Additional Disclosures [Abstract] |  |  |  |  |  |  |
Stock-based compensation expense | $ 21,982 | $ 20,009 | $ 18,327 |  |  |  |
Restricted Stock Awards [Member] |  |  |  |  |  |  |
Restricted Shares [Roll Forward] |  |  |  |  |  |  |
Nonvested shares at beginning of year (in shares) | 943 | 756 | 861 |  |  |  |
Granted (in shares) | 706 | 759 | 415 |  |  |  |
Change in shares due to performance (in shares) |  | (70) | (19) |  |  |  |
Change in shares due to performance (in shares) | 118 |  |  |  |  |  |
Vested and issued (in shares) | (362) | (329) | (357) |  |  |  |
Forfeited (in shares) | (125) | (173) | (144) |  |  |  |
Nonvested shares at end of year (in shares) | 1,280 | 943 | 756 | 861 |  |  |
Weighted Average Grant Date Value [Abstract] |  |  |  |  |  |  |
Nonvested shares at beginning of year (in dollars per share) | $ 49.74 |  |  |  |  |  |
Granted (in dollars per share) | 41.49 |  |  |  |  |  |
Change in shares due to performance (in dollars per share) | 49.84 |  |  |  |  |  |
Vested and issued (in dollars per share) | 48.48 |  |  |  |  |  |
Forfeited (in dollars per share) | 47.88 |  |  |  |  |  |
Nonvested shares at end of year (in dollars per share) | $ 45.73 | $ 49.74 |  |  |  |  |
Restricted Stock, Additional Disclosures [Abstract] |  |  |  |  |  |  |
Unrecognized share-based compensation expense | $ 36,300 |  |  |  |  |  |
Award vesting period | 4 years |  |  |  |  |  |
Weighted average recognition period for unrecognized share-based compensation | 2 years 2 months 12 days |  |  |  |  |  |
Total grant date fair value of restricted shares vested | $ 17,600 | $ 17,500 | $ 19,600 |  |  |  |
Restricted Stock Awards [Member] | Key Employees [Member] | Vesting on Fourth Anniversary Date Following Date of Grant [Member] |  |  |  |  |  |  |
Stock-Based Compensation [Abstract] |  |  |  |  |  |  |
Award vesting percentage |  |  |  |  |  |  | 50.00%
Restricted Stock Awards [Member] | Key Employees [Member] | Vesting on Fifth Anniversary Date Following Date of Grant [Member] |  |  |  |  |  |  |
Stock-Based Compensation [Abstract] |  |  |  |  |  |  |
Award vesting percentage |  |  |  |  |  |  | 50.00%
Restricted Stock Awards [Member] | Key Employees [Member] | Annual Vesting on Anniversary of Grant [Member] |  |  |  |  |  |  |
Stock-Based Compensation [Abstract] |  |  |  |  |  |  |
Award vesting percentage |  |  |  |  |  | 25.00% |
Restricted Stock Awards [Member] | Key Employees [Member] | Vesting on June 30th of Year Following Performance Cycle [Member] |  |  |  |  |  |  |
Stock-Based Compensation [Abstract] |  |  |  |  |  |  |
Award vesting percentage |  | 100.00% | 100.00% | 100.00% |  |  |
Performance-based Restricted Stock Awards [Member] |  |  |  |  |  |  |
Stock-Based Compensation [Abstract] |  |  |  |  |  |  |
Period for achievement of performance-based targets | 3 years |  |  |  |  |  |
Performance-based Restricted Stock Awards [Member] | Vesting on First Anniversary Date after Award Is Earned [Member] |  |  |  |  |  |  |
Stock-Based Compensation [Abstract] |  |  |  |  |  |  |
Award vesting percentage |  |  |  |  |  |  | 50.00%
Performance-based Restricted Stock Awards [Member] | Vesting on Second Anniversary Date after Award Is Earned [Member] |  |  |  |  |  |  |
Stock-Based Compensation [Abstract] |  |  |  |  |  |  |
Award vesting percentage |  |  |  |  |  |  | 50.00%
Performance-based Restricted Stock Awards [Member] | Vesting at End of Performance Cycle [Member] |  |  |  |  |  |  |
Stock-Based Compensation [Abstract] |  |  |  |  |  |  |
Award vesting percentage |  |  |  |  | 50.00% | 50.00% |
Performance-based Restricted Stock Awards [Member] | Vesting on April 30th of Year Following Performance Cycle [Member] |  |  |  |  |  |  |
Stock-Based Compensation [Abstract] |  |  |  |  |  |  |
Award vesting percentage |  |  |  |  | 50.00% | 50.00% |

X
- Definition The weighted average fair value at grant date for nonvested equity-based awards that changed due to performance during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References No definition available. + Details
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- Definition The number of equity-based payment instruments, excluding stock options, that decreased due to performance. + References No definition available. + Details
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- Definition The number of equity-based payment instruments, excluding stock options, that increased due to performance. + References No definition available. + Details
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- Definition The period of time during which certain financial performance-based targets must be achieved in order to trigger payment of performance-based restricted stock awards under the terms of the long-term incentive plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Amount of noncash expense for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 + Details
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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Percentage of vesting of award under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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