Debt Level 4 (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
Sep. 30, 2012	Sep. 30, 2011	Mar. 31, 2012
Debt Instrument [Line Items]
Proceeds from Lines of Credit	$ 224,340	$ 0
Debt Instrument, Face Amount	210,000		210,000
Line of Credit Facility, Amount Outstanding	224,340		0
Long-term Debt	$ 434,340		$ 210,000

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date. 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, and after deducting unamortized discount or premiums, if any.

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The cash inflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with either short term or long term maturity that is collateralized (backed by pledge, mortgage or other lien in the entity's assets).

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