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Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended
	Jul. 31, 2019	Jul. 31, 2018
Effective income tax rate [Abstract]
Effective tax rate as reported	8.60%	22.80%
Certain discrete items	$ 0.4
The Tax Act [Abstract]
Effective Tax Rate excluding the impact of non-recurring items from the Tax Act	22.50%

X

- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations, excluding the impact of non-recurring items from the Tax Act.

+ References

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- Definition

Amount of income tax expense (benefit) related to discrete items pertaining to continuing operations.

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- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h)(2))
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-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 13
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