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Incentive and Stock-Based Compensation (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 30, 2011 years	Oct. 01, 2010	Sep. 30, 2011	Oct. 01, 2010	Sep. 30, 2011 Performance-Based Awards, Performance Shares, Units [Member]	Sep. 30, 2011 Performance-Based Awards, PARS Units [Member]	Sep. 30, 2011 Performance-Based Awards, PARS Shares [Member]	Sep. 30, 2011 Time-Based Awards, Shares [Member]	Sep. 30, 2011 Time-Based Awards, Deferred Units [Member]	Sep. 30, 2011 Shareholder Value Plan [Member]	Apr. 01, 2011 Shareholder Value Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting period					3 years	5 years
Terms of award					These awards, which are denominated in terms of a target number of shares, will be forfeited if performance falls below a designated threshold level and may vest for up to 250% of the target number of shares for exceptional performance. The ultimate number of shares delivered to recipients and the related compensation cost recognized as expense will be based on actual performance.
Award subject to accelerated vesting period						3 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Balance, April 1, 2011					479	191	532	298	15
Granted					88	88	38	72	0
Reduction from change in estimate					(40)	0	0	0	0
Vested					(162)	0	(81)	(43)	0
Forfeited					0	0	(8)	(3)	0
Balance, September 30, 2011					365	279	481	324	15
Stock Options Outstanding [Roll Forward]
Balance, April 1, 2011			220
Exercised			(45)
Balance, September 30, 2011	175		175
Restricted Stock Compensation Expense [Abstract]
Stock-based compensation expense	$ 1,456	$ 2,556	$ 3,408	$ 5,262
Income tax benefit related to stock-based compensation expense	553	972	1,295	2,001
Unrecognized compensation cost related to non-vested awards	22,198		22,198
Weighted average period of recognition on non-vested awards	3.4
Cash-Based Compensation, Long-Term Executive Plan [Line Items]
Performance period for cash-based incentive compensation										36-month
Accrued incentive compensation cost										$ 620	$ 10,697