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Employee Stock Plans (Outstanding Stock Options And SARs) (Detail) - Apr. 30, 2015 - $ / shares shares in Thousands	Total
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Shares	202
Options Outstanding, Weighted-Average Remaining Contractual Life (in years)	1 year 6 months
Options Outstanding, Weighted-Average Exercise Price	$ 15.45
Options Exercisable, Shares	192
Options Exercisable, Weighted-Average Remaining Contractual Life (in years)	1 year 4 months 24 days
Options Exercisable, Weighted-Average Exercise Price	$ 15.07
$9.75 - $ 13.82
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Minimum	9.75
Range of Exercise Prices, Maximum	$ 13.82
Options Outstanding, Shares	48
Options Outstanding, Weighted-Average Remaining Contractual Life (in years)	1 year 3 months 18 days
Options Outstanding, Weighted-Average Exercise Price	$ 10.00
Options Exercisable, Shares	48
Options Exercisable, Weighted-Average Remaining Contractual Life (in years)	1 year 3 months 18 days
Options Exercisable, Weighted-Average Exercise Price	$ 10.00
$13.83 - $ 15.83
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Minimum	13.83
Range of Exercise Prices, Maximum	$ 15.83
Options Outstanding, Shares	67
Options Outstanding, Weighted-Average Remaining Contractual Life (in years)	2 years 2 months 12 days
Options Outstanding, Weighted-Average Exercise Price	$ 13.94
Options Exercisable, Shares	67
Options Exercisable, Weighted-Average Remaining Contractual Life (in years)	2 years 2 months 12 days
Options Exercisable, Weighted-Average Exercise Price	$ 13.94
$15.84 - $ 19.88
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Minimum	15.84
Range of Exercise Prices, Maximum	$ 19.88
Options Outstanding, Shares	50
Options Outstanding, Weighted-Average Remaining Contractual Life (in years)	3 months 18 days
Options Outstanding, Weighted-Average Exercise Price	$ 17.96
Options Exercisable, Shares	50
Options Exercisable, Weighted-Average Remaining Contractual Life (in years)	3 months 18 days
Options Exercisable, Weighted-Average Exercise Price	$ 17.96
$19.89 - $ 24.08
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Minimum	19.89
Range of Exercise Prices, Maximum	$ 24.08
Options Outstanding, Shares	37
Options Outstanding, Weighted-Average Remaining Contractual Life (in years)	2 years 3 months 18 days
Options Outstanding, Weighted-Average Exercise Price	$ 21.87
Options Exercisable, Shares	27
Options Exercisable, Weighted-Average Remaining Contractual Life (in years)	1 year 10 months 24 days
Options Exercisable, Weighted-Average Exercise Price	$ 21.55

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

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The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

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Weighted average remaining contractual term of exercisable stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

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