Employee Stock Plans - Additional Information (Detail) (USD $)	3 Months Ended
Jul. 31, 2012	Jul. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average assumptions used to estimate fair value of stock-based compensation, expected volatility		47.07%
Weighted-average assumptions used to estimate fair value of stock-based compensation, risk-free interest rate		1.47%
Weighted-average assumptions used to estimate fair value of stock-based compensation, expected life (in years)		5 years
Weighted-average assumptions used to estimate fair value of stock-based compensation, dividend yield rate		0.00%
Maximum number of shares of common stock available for stock option issuance	3,980,000
Shares available for future issuance	393,103
Cash proceeds from exercise of stock options	$ 200,000	$ 1,700,000
Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares repurchased during the period
Stock issued for stock options exercised	24,281	113,686
Employee Stock Purchase Plan
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
Employees stock purchased, per share value		$ 18.69
Shares reserved for issuance	1,500,000
Amended shares reserved for issuance	3,000,000
Time-based restricted stock \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Time-based restricted stock \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	4 years
Market-based restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation cost related to non-vested awards	25,100,000
Expected cost recognized over weighted-average period	2 years 2 months 12 days
Shares repurchased during the period	177,126	176,658
Common stock repurchased, value	2,500,000	4,000,000
Stock Options And Stock Appreciation Rights
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation cost related to non-vested awards	$ 1,400,000
Expected cost recognized over weighted-average period	1 year
Stock issued for stock options exercised	24,000
Stock Incentive Plan 2008
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of full-value stock awards limitation, required ratio to stock option and stock appreciation rights	1.5

Amended Shares Reserved for Issuance.

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The amount per a share that the employees paid for the shares purchased through the ESPP.

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Original Shares Reserved for Issuance.

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Share-based compensation arrangement by share-based payment award, maximum employee subscription value.

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As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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Period 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, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Number of shares issued during the period as a result of an employee stock purchase plan.

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Number of share options (or share units) exercised during the current period.

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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