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Capital Stock and Changes in Capital Accounts, Share Repurchases (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 12 Months Ended |
--- | --- | ---
Apr. 30, 2022 | Apr. 30, 2021 | Apr. 30, 2020 | Apr. 30, 2017
Class A [Member] |  |  |  |
Share Repurchases [Abstract] |  |  |  |
Shares repurchased (in shares) | 542 | 308 | 1,080 |
Average Price (in dollars per share) | $ 55.14 | $ 50.93 | $ 43.05 |
Class B [Member] |  |  |  |
Share Repurchases [Abstract] |  |  |  |
Shares repurchased (in shares) | 2 | 2 | 2 |
Average Price (in dollars per share) | $ 55.14 | $ 50.93 | $ 43.05 |
2017 Share Repurchase Program [Member] |  |  |  |
Capital Stock [Abstract] |  |  |  |
Additional shares/dollars of common stock approved for repurchase under the share repurchase program (in shares in 2019 and dollars in 2020) |  |  |  | 4,000
Remaining number of shares/dollars authorized to be repurchased under the share repurchase program in 2017 program (shares) and 2020 program (dollars) | 0 |  |  |
2020 Share Repurchase Program [Member] |  |  |  |
Capital Stock [Abstract] |  |  |  |
Amount of additional stock authorized to be repurchased |  |  | $ 200.0 |
Remaining amount authorized to be repurchased under the share repurchase program | $ 197.5 |  |  |

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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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- Definition The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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- Definition Amount remaining of a stock repurchase plan authorized. + References No definition available. + Details
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- Definition The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21463-112644 Reference 2: 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 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 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(28)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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