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Employee Stock Plans (Outstanding Stock Options And SARs) (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Apr. 30, 2014
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Shares	396
Options Outstanding, Weighted-Average Remaining Contractual Life (in years)	2 years 2 months 12 days
Options Outstanding, Weighted-Average Exercise Price	$ 16.23
Options Exercisable, Shares	337
Options Exercisable, Weighted-Average Remaining Contractual Life (in years)	2 years
Options Exercisable, Weighted-Average Exercise Price	$ 16.11
$ 9.75 - $ 13.90
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	$ 13.90
Options Outstanding, Shares	159
Options Outstanding, Weighted-Average Remaining Contractual Life (in years)	2 years 10 months 24 days
Options Outstanding, Weighted-Average Exercise Price	$ 12.49
Options Exercisable, Shares	122
Options Exercisable, Weighted-Average Remaining Contractual Life (in years)	2 years 9 months 18 days
Options Exercisable, Weighted-Average Exercise Price	$ 12.05
$13.91 - $ 17.97
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Minimum	$ 13.91
Range of Exercise Prices, Maximum	$ 17.97
Options Outstanding, Shares	111
Options Outstanding, Weighted-Average Remaining Contractual Life (in years)	1 year 9 months 18 days
Options Outstanding, Weighted-Average Exercise Price	$ 16.68
Options Exercisable, Shares	109
Options Exercisable, Weighted-Average Remaining Contractual Life (in years)	1 year 8 months 12 days
Options Exercisable, Weighted-Average Exercise Price	$ 16.69
$17.98 - $ 19.37
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Minimum	$ 17.98
Range of Exercise Prices, Maximum	$ 19.37
Options Outstanding, Shares	63
Options Outstanding, Weighted-Average Remaining Contractual Life (in years)	4 months 24 days
Options Outstanding, Weighted-Average Exercise Price	$ 19.24
Options Exercisable, Shares	63
Options Exercisable, Weighted-Average Remaining Contractual Life (in years)	4 months 24 days
Options Exercisable, Weighted-Average Exercise Price	$ 19.24
$19.38 - $ 24.08
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Minimum	$ 19.38
Range of Exercise Prices, Maximum	$ 24.08
Options Outstanding, Shares	63
Options Outstanding, Weighted-Average Remaining Contractual Life (in years)	3 years 2 months 12 days
Options Outstanding, Weighted-Average Exercise Price	$ 21.95
Options Exercisable, Shares	43
Options Exercisable, Weighted-Average Remaining Contractual Life (in years)	2 years 8 months 12 days
Options Exercisable, Weighted-Average Exercise Price	$ 21.59

X

- Definition

Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(iii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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X

- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (e)(2)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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X

- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (g)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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X

- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(iii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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X

- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(i)-(ii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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X

- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(i)-(ii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (e)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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X

- Definition

The ceiling 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (g)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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