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Basis of Presentation - Additional Information (Detail) - USD ($) $ in Millions	Jul. 31, 2015	Apr. 30, 2015
Accounting Policies [Abstract]
Decrease in other assets and other long-term liabilities as a result of adopting ASU	$ (3.0)	$ (4.1)

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- Definition

Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.

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