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Debt (Details) (USD $)
6 Months Ended6 Months Ended
Sep. 30, 2011
Apr. 01, 2011
Sep. 30, 2011
Line of Credit [Member]
Apr. 01, 2011
Line of Credit [Member]
Sep. 30, 2011
Convertible Debt [Member]
Apr. 01, 2011
Convertible Debt [Member]
Aug. 08, 2004
Convertible Debt [Member]
Sep. 30, 2011
Capital Lease Obligations [Member]
Apr. 01, 2011
Capital Lease Obligations [Member]
Debt Instrument [Line Items]         
Debt, Long-term and Short-term, Combined Amount$ 250,565,000$ 196,423,000$ 50,000,000$ 0$ 200,185,000$ 195,643,000 $ 380,000$ 780,000
Less: Current portion of long-term debt50,380,000761,000       
Long-term debt200,185,000195,662,000       
Revolving line of credit, outstanding borrowings  50,000,000      
Revolving line of credit, maximum borrowings capacity  200,000,000      
Revolving line of credit, maximum borrowings including additional borrowings available via accordion feature  250,000,000      
Revolving line of credit, remaining borrowing capacity  150,000,000      
Revolving line of credit, additional borrowings available through accordion feature  50,000,000      
Revolving line of credit, average daily interest rate  2.00%      
Principal balance230,000,000230,000,000  230,000,000230,000,000   
Unamortized discount    29,815,00034,357,000   
Net carrying amount    200,185,000195,643,000   
Debt Instrument, Convertible, Carrying Amount of Equity Component, Pretax    55,636,00055,636,000   
Convertible Debt, Deferred Tax Liability, Recognized at Issuance      20,523,000  
Convertible Debt [Abstract]         
Principal balance$ 230,000,000$ 230,000,000  $ 230,000,000$ 230,000,000   
Stated interest rate of convertible debt3.125%        
Debt Instrument, Convertible, Terms of Conversion FeatureThe notes will be convertible into cash up to the principal amount of the notes and shares of the Company’s common stock for any conversion value in excess of the principal amount under certain circumstances. The ability of note holders to convert is assessed on a quarterly basis and is dependent on the trading price of the Company’s stock during the last 30 trading days of each quarter (“Contingent Conversion Trigger”).