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Employee Stock Plans (Tables) | 9 Months Ended
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Jan. 31, 2012
Employee Stock Plans [Abstract] |
Components Of Stock-Based Compensation Expense Recognized |
|  | Three Months Ended January 31, |  |  | Nine Months Ended January 31, |
|  | 2012 |  |  | 2011 |  |  | 2012 |  |  | 2011 |
|  | (in thousands) |
Restricted stock |  | $ | 3,198 |  |  | $ | 3,481 |  |  | $ | 9,119 |  |  | $ | 10,633 |
Stock options and SARs |  |  | 264 |  |  |  | 400 |  |  |  | 709 |  |  |  | 847 |
ESPP |  |  | (146 | ) |  |  | 88 |  |  |  | 85 |  |  |  | 295 |
Total stock-based compensation expense, pre-tax |  |  | 3,316 |  |  |  | 3,969 |  |  |  | 9,913 |  |  |  | 11,775 |
Tax benefit from stock-based compensation expense |  |  | (1,147 | ) |  |  | (1,449 | ) |  |  | (3,475 | ) |  |  | (4,298 | )
Total stock-based compensation expense, net of tax |  | $ | 2,169 |  |  | $ | 2,520 |  |  | $ | 6,438 |  |  | $ | 7,477 |
Weighted-Average Assumptions Used To Estimate Fair Value Of Each Employee Stock Option And SARs |
|  | Nine Months Ended January 31, |
|  | 2012 |  |  | 2011 |
Expected volatility |  |  | 47.07 | % |  |  | 47.67 | %
Risk-free interest rate |  |  | 1.47 | % |  |  | 1.83 | %
Expected option life (in years) |  |  | 5.00 |  |  |  | 5.00 |
Expected dividend yield |  |  | 0.00 | % |  |  | 0.00 | %
Stock Options And SARs Transactions |
|  | Nine Months Ended January 31, 2012 |
|  | Options |  |  | Weighted- Average Exercise Price |  |  | Weighted- Average Remaining Contractual Life (In Years) |  |  | Aggregate Intrinsic Value |
|  | (in thousands, except per share data) |
Outstanding, April 30, 2011 |  |  | 1,833 |  |  | $ | 13.78 |  |  |  |  |  |  |  |  |
Granted |  |  | 48 |  |  | $ | 22.71 |  |  |  |  |  |  |  |  |
Exercised |  |  | (144 | ) |  | $ | 14.00 |  |  |  |  |  |  |  |  |
Forfeited/expired. |  |  | (134 | ) |  | $ | 16.22 |  |  |  |  |  |  |  |  |
Outstanding, January 31, 2012 |  |  | 1,603 |  |  | $ | 13.80 |  |  |  | 3.38 |  |  | $ | 5,867 |
Exercisable, January 31, 2012 |  |  | 1,132 |  |  | $ | 14.07 |  |  |  | 2.71 |  |  | $ | 4,027 |
Additional Information Stock Options And SARs |
|  | Three Months Ended January 31, |  |  | Nine Months Ended January 31, |
|  | 2012 |  |  | 2011 |  |  | 2012 |  |  | 2011 |
|  | (in thousands, except per share data) |
Weighted-average fair value of stock options granted |  | $ | — |  |  | $ | 7.81 |  |  | $ | 9.61 |  |  | $ | 6.07 |
Total fair value of stock options and SARs vested |  | $ | 20 |  |  | $ | 27 |  |  | $ | 914 |  |  | $ | 642 |
Total intrinsic value of stock options exercised |  | $ | 127 |  |  | $ | 3,330 |  |  | $ | 986 |  |  | $ | 4,015 |
Total intrinsic value of SARs paid |  | $ | 34 |  |  | $ | — |  |  | $ | 45 |  |  | $ | 67 |
Restricted Stock Activity |
|  | Shares |  |  | Weighted- Average Grant Date Fair Value |
|  | (in thousands, except per share data) |
Non-vested, April 30, 2011 |  |  | 2,007 |  |  | $ | 8.64 |
Granted |  |  | 624 |  |  | $ | 21.96 |
Vested |  |  | (750 | ) |  | $ | 12.17 |
Forfeited/expired. |  |  | (76 | ) |  | $ | 16.80 |
Non-vested, January 31, 2012 |  |  | 1,805 |  |  | $ | 11.43 |

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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 718 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph (h)(1) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for stock options and stock appreciation rights that were outstanding at the beginning and end of the year, exercisable at the end of the year, and the number of stock options and stock appreciation rights that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 718 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph (c)(1) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 718 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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