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Valuation And Qualifying Accounts (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Mar. 31, 2012 | Mar. 31, 2011 | Mar. 31, 2010
Allowance For Doubtful Accounts Receivable [Member] |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance Beginning of Year | $ 683 | $ 766 | $ 1,343
Additions | 6 | 28 | 286
Write-offs | (631) | (118) | (54)
Recoveries and Other Adjustments | (6) | 7 | (809)
Balance End of Year | 52 | 683 | 766
Deferred Tax Asset Valuation Allowance [Member] |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance Beginning of Year | 220,596 | 187,358 | 174,695
Additions | 41,709 | 43,308 | 16,189
Expirations | (10,003) | (10,063) | (4,148)
Adjustments |  | (7) | 622
Balance End of Year | $ 252,302 | $ 220,596 | $ 187,358

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- Definition Valuation allowances and reserves expirations. + References No definition available. + Details
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- Definition Valuation allowances and reserves recoveries and other adjustments. + References No definition available. + Details
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- Definition Total of the adjustments in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e24092-122690 + Details
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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e24092-122690 + Details
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- Definition Total of the deductions in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, representing receivables written off as uncollectible and portions of the reserves utilized, respectively. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e24092-122690 + Details
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- Definition Total increases or decreases in allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e24092-122690 + Details
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