Capital Stock [Abstract]

No definition available.

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- Definition

Amount of stock repurchase plan authorized.

+ References

No definition available.

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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.

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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
-Name Accounting Standards Codification
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-Topic 946
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- References

No definition available.

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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
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 45
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- Details

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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, 2023	Apr. 30, 2022	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2017
Class A
Share Repurchases [Abstract]
Stock repurchased during period, shares	831	542	308
Treasury stock acquired, average cost per share	$ 42.07	$ 55.14	$ 50.93
Class B
Share Repurchases [Abstract]
Stock repurchased during period, shares	1	2	2
Treasury stock acquired, average cost per share	$ 42.07	$ 55.14	$ 50.93
2017 Share Repurchase Program
Capital Stock [Abstract]
Additional shares of common stock approved for repurchase under the share repurchase program (in shares)					4,000
Stock repurchase program, remaining number of shares authorized to be repurchased		0
2020 Share Repurchase Program
Capital Stock [Abstract]
Stock repurchase program, authorized amount				$ 200.0
Remaining amount authorized to be repurchased under the share repurchase program	$ 162.5