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Employee Stock Plans (Narrative) (Detail) (USD $)	12 Months Ended
	Apr. 30, 2012 Year	Apr. 30, 2011	Apr. 30, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares of common stock available for stock option issuance	3,980,000
Shares available for future issuance	1,500,000
Aggregate intrinsic value of options outstanding	$ 5,000,000
Aggregate intrinsic value of options exercisable	3,400,000
Common stock repurchased, value		10,600,000
Proceeds from exercise of warrants		2,983,000
Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares repurchased during the period	0	724,064
Stock issued for stock options exercised	228,835	611,621
Cash proceeds from exercise of stock options	2,900,000	7,900,000
Stock Options And SARs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period, minimum (in years)	three
Vesting period, maximum (in years)	four
Total unrecognized compensation cost related to non-vested awards	1,900,000
Expected cost recognized over weighted-average period (in years)	1.1
Stock issued for stock options exercised	235,000	625,000	531,000
Stock Options And SARs [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period (in years)	seven
Stock Options And SARs [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period (in years)	ten
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period, minimum (in years)	three
Vesting period, maximum (in years)	four
Total unrecognized compensation cost related to non-vested awards	17,500,000
Expected cost recognized over weighted-average period (in years)	1.9
Market-based shares vesting period (in years)	three
Shares repurchased during the period	190,141	211,315
Common stock repurchased, value	4,200,000	3,200,000
ESPP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future issuance	1,600,000
Authorized payroll deductions	15.00%
Authorized payroll deductions, value	25,000
Fair market price of common stock	85.00%
Employees stock purchased	76,909	153,913	209,840
Employees stock purchased, per share value	$ 18.69	14.13	10.66
Shares reserved for issuance	1,500,000
Amended shares reserved for issuance	3,000,000
Warrant [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrant date issued	Jun. 30, 2002
Warrants issued	274,207
Common stock at an exercise price	11.94
Common stock issued in exchange for warrants		274,207
Proceeds from exercise of warrants		3,000,000

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Employee stock purchase plan, per share value.

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With respect to warrants or rights outstanding as of the balance sheet date, this item provides disclosure of the date from which warrants or rights are exercisable.

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Description of the period of time over which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, which may be expressed in a variety of ways (for example, in years, month and year).

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The discount rate from market value on purchase date that participants pay for shares.

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Research Bulletin (ARB)

-Number 43

-Chapter 1

-Section B

-Paragraph 11A

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Balance Type:	na
Period Type:	duration

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- Definition

Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30, 31

-Article 5



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 12

-Paragraph 10

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Research Bulletin (ARB)

-Number 43

-Chapter 1

-Section B

-Paragraph 11A

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

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Balance Type:	debit
Period Type:	duration