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Fair Value of Financial Instruments (Details) (Fair value of assets and liabilities that are measured on a recurring basis, Fair Value Measurements Using Inputs Considered as Level 2, USD $) In Thousands, unless otherwise specified	Jan. 01, 2012	Mar. 31, 2011
Fair value of assets and liabilities that are measured on a recurring basis \| Fair Value Measurements Using Inputs Considered as Level 2
Assets
Marketable securities	$ 10,877	$ 9,470
Derivatives	9,791	49,407
Liabilities
Derivatives	$ 12,934

The total amount of cash and securities held by third party trustees pursuant to terms of debt instruments or other agreements as of the date of each statement of financial position presented, which can be used by the trustee only to pay the noncurrent portion of specified obligations.

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- Definition

Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

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- Definition

Fair values as of the balance sheet date of all liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

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