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Advertising Costs - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2015
Selling and Marketing Expense
Advertising Costs [Line Items]
Advertising expense for continuing operations	$ 22.3	$ 21.8	$ 20.2

X

- Definition

Advertising costs.

+ References

No definition available.

+ Details

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X

- Definition

Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 720
-SubTopic 35
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848

+ Details

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Balance Type:	debit
Period Type:	duration

X

- Details

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