Convertible Senior Subordinated Notes and Other Financing Obligations (Subordinated Notes And Other Financing Obligations Outstanding) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2011	Mar. 31, 2011
Debt Instrument [Line Items]
Other financing obligations	$ 3,718	$ 3,718
Convertible senior subordinated notes and other financing obligations	96,241	110,973
October 2004 Notes [Member]
Debt Instrument [Line Items]
Coupon rate	2.9375%
October 2004 Notes [Member] \| Convertible Subordinated Debt [Member]
Debt Instrument [Line Items]
Principal amount of notes outstanding	26,931	46,326
Unamortized Discount	(42)	(1,598)
Net Carrying Amount of Notes Outstanding	26,889	44,728
Equity component	47,955	48,080
Coupon rate	2.9375%
February 2005 Notes [Member] \| Convertible Subordinated Debt [Member]
Debt Instrument [Line Items]
Principal amount of notes outstanding	23,470	23,470
Unamortized Discount	(659)	(1,363)
Net Carrying Amount of Notes Outstanding	22,811	22,107
Equity component	50,855	50,855
Coupon rate	3.625%
April 2009 Notes [Member] \| Convertible Subordinated Debt [Member]
Debt Instrument [Line Items]
Principal amount of notes outstanding	66,581	66,581
Unamortized Discount	(23,758)	(26,161)
Net Carrying Amount of Notes Outstanding	42,823	40,420
Equity component	16,085	16,085
Coupon rate	3.625%
Convertible Subordinated Debt [Member]
Debt Instrument [Line Items]
Principal amount of notes outstanding	116,982	136,377
Unamortized Discount	(24,459)	(29,122)
Net Carrying Amount of Notes Outstanding	$ 92,523	$ 107,255

The carrying value of other financing obligations.

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Including the current and noncurrent portions, the carrying value of convertible subordinated debt, as of the balance sheet date, initially scheduled to be repaid after one year or beyond the normal operating cycle if longer. This form of debt can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder, and places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets. Plus the carrying value of other financing obligations.

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- Definition

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- Definition

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion.

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- Definition

Interest rate stated in the contractual debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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