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Employee Stock Plans (Tables)

6 Months Ended

Oct. 31, 2011

Employee Stock Plans [Abstract]

Components Of Stock-Based Compensation Expense Recognized

		Three Months Ended October 31,								Six Months Ended October 31,
		2011				2010				2011				2010
		(in thousands)
Restricted stock		$	3,137			$	3,588			$	5,921			$	7,152
Stock options and SARs			187				311				445				447
ESPP			103				92				231				207
Total stock-based compensation expense, pre-tax			3,427				3,991				6,597				7,806
Tax benefit from stock-based compensation expense			(1,182	)			(1,457	)			(2,328	)			(2,849	)
Total stock-based compensation expense, net of tax		$	2,245			$	2,534			$	4,269			$	4,957

Weighted-Average Assumptions Used To Estimate Fair Value Of Each Employee Stock Option And SARs

		Six Months Ended October  31,
		2011				2010
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

		Six Months Ended October 31, 2011
		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			(118	)		$	14.60
Forfeited/expired.			(75	)		$	16.38
Outstanding, October 31, 2011			1,688			$	13.84				3.59			$	5,666
Exercisable, October 31, 2011			1,202			$	14.05				2.92			$	4,010

Additional Information Stock Options And SARs

		Three Months  Ended October 31,								Six Months Ended October  31,
		2011				2010				2011				2010
		(in thousands, except per share data)
Weighted-average fair value of stock options granted		$	—			$	6.86			$	9.61			$	6.05
Total fair value of stock options and SARs vested		$	78			$	71			$	894			$	615
Total intrinsic value of stock options exercised		$	11			$	509			$	859			$	685
Total intrinsic value of SARs paid		$	—			$	67			$	11			$	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			(743	)		$	7.97
Forfeited/expired.			(71	)		$	16.59
Non-vested, October 31, 2011			1,817			$	13.17

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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.

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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.

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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.

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