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Stockholders' Equity - Share Based Payment Award Performance Shares Valuation Assumptions (Parenthetical) (Detail)	12 Months Ended
	Apr. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance based restricted stock unit performance period	3 years
PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance based restricted stock unit performance period	3 years

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- Definition

Share based compensation arrangement by share based payment award performance period.

+ References

No definition available.

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Details

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Namespace Prefix:
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Balance Type:
Period Type: