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Changes in Each Component of Accumulated Other Comprehensive Income (Loss) (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
	Oct. 31, 2014	Oct. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Tax effects on reclassifications of realized net losses	$ 0.3	$ 0.6

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- Definition

Amount of tax (expense) benefit of reclassification adjustment from accumulated other comprehensive (income) loss related to pension and other postretirement defined benefit plans.

+ References

No definition available.

+ Details

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