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Marketable Securities And Fair Value Disclosures (Assets And Liabilities Carried At Fair Value) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2012 | Mar. 31, 2011
--- | --- | ---
Total Carrying Value [Member] | Cash Equivalents [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | $ 23,485 | $ 49,837
Total Carrying Value [Member] | Short-Term Government-Backed Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets |  | 76,371
Total Carrying Value [Member] | Short-Term Commercial Paper [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | 5,304 | 39,755
Total Carrying Value [Member] | Derivatives [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets |  | 3,087
Quoted Prices In Active Markets (Level 1) [Member] | Cash Equivalents [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | 23,485 | 49,837
Using Significant Other Observable Inputs (Level 2) [Member] | Short-Term Government-Backed Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets |  | 76,371
Using Significant Other Observable Inputs (Level 2) [Member] | Short-Term Commercial Paper [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | 5,304 | 39,755
Using Significant Other Observable Inputs (Level 2) [Member] | Derivatives [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets |  | 3,087
Using Significant Unobservable Inputs (Level 3) [Member] | Cash Equivalents [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets |  |
Using Significant Unobservable Inputs (Level 3) [Member] | Short-Term Government-Backed Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets |  |
Using Significant Unobservable Inputs (Level 3) [Member] | Short-Term Commercial Paper [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets |  |
Using Significant Unobservable Inputs (Level 3) [Member] | Derivatives [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets |  |

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
Name: | us-gaap_AssetsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration