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Debt (Details) (USD $) | 3 Months Ended | 6 Months Ended |  | 6 Months Ended |  |  |  | 0 Months Ended | 1 Months Ended | 6 Months Ended | 40 Months Ended | 0 Months Ended | 3 Months Ended | 6 Months Ended |  |  |  |  | 0 Months Ended |  | 0 Months Ended | 1 Months Ended |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |
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Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | May 31, 2013 Fenco [Member] | Sep. 30, 2013 Financing Agreement [Member] | Aug. 30, 2013 Financing Agreement [Member] | Jul. 31, 2013 Financing Agreement [Member] | Jun. 28, 2013 Financing Agreement [Member] | May 24, 2012 Financing Agreement [Member] Term Loans [Member] | Aug. 31, 2013 Financing Agreement [Member] Term Loans [Member] | Sep. 30, 2013 Financing Agreement [Member] Term Loans [Member] | Jan. 17, 2017 Financing Agreement [Member] Term Loans [Member] | Nov. 06, 2013 Financing Agreement [Member] Term Loans [Member] Subsequent Event [Member] | Sep. 30, 2013 Financing Agreement [Member] Term Loans [Member] Cerberus Warrant [Member] | Sep. 30, 2012 Financing Agreement [Member] Term Loans [Member] Cerberus Warrant [Member] | Sep. 30, 2013 Financing Agreement [Member] Term Loans [Member] Cerberus Warrant [Member] | Sep. 30, 2012 Financing Agreement [Member] Term Loans [Member] Cerberus Warrant [Member] | Mar. 31, 2013 Financing Agreement [Member] Term Loans [Member] Cerberus Warrant [Member] | Aug. 31, 2012 Financing Agreement [Member] Term Loans [Member] Cerberus Warrant [Member] | Sep. 30, 2013 Financing Agreement [Member] Revolving Facility [Member] | Mar. 31, 2013 Financing Agreement [Member] Revolving Facility [Member] | Nov. 06, 2013 Financing Agreement [Member] Revolving Facility [Member] Subsequent Event [Member] | Sep. 30, 2013 Financing Agreement [Member] Revolving Facility [Member] Letter of Credit [Member] | Sep. 30, 2013 Financing Agreement [Member] Revolving Facility [Member] Commercial Letter Of Credit [Member] | Sep. 30, 2013 Financing Agreement [Member] Revolving Facility [Member] Standby Letters of Credit [Member] | Aug. 26, 2013 Strategic Cooperation Agreement [Member] | Aug. 31, 2012 Strategic Cooperation Agreement [Member] | Jun. 10, 2014 Strategic Cooperation Agreement [Member] | Dec. 10, 2013 Strategic Cooperation Agreement [Member] | Aug. 31, 2012 Strategic Cooperation Agreement [Member] Supplier Warrant [Member] | Sep. 30, 2013 Strategic Cooperation Agreement [Member] Supplier Warrant [Member] | Sep. 30, 2012 Strategic Cooperation Agreement [Member] Supplier Warrant [Member] | Sep. 30, 2013 Strategic Cooperation Agreement [Member] Supplier Warrant [Member] | Sep. 30, 2012 Strategic Cooperation Agreement [Member] Supplier Warrant [Member] | Mar. 31, 2013 Strategic Cooperation Agreement [Member] Supplier Warrant [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  | $ 85,000,000 |  |  |  | $ 95,000,000 |  |  |  |  |  |  | $ 20,000,000 |  | $ 30,000,000 | $ 10,000,000 |  |  |  | $ 22,000,000 |  |  |  |  |  |  |  |
Debt instrument, maturity date |  |  |  |  |  | Jan. 17, 2017 |  |  |  |  |  |  |  | Nov. 06, 2018 |  |  |  |  |  |  |  |  | Nov. 06, 2018 |  |  |  |  | Jul. 31, 2017 |  |  |  |  |  |  |  |
Reference interest rate under option 1 |  |  |  |  |  |  |  |  |  | LIBOR |  |  |  | LIBOR |  |  |  |  |  |  |  |  | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate over LIBOR rate under option 1 (in hundredths) |  |  |  |  |  |  |  |  |  | 8.50% |  |  |  | 5.25% |  |  |  |  |  |  |  |  | 2.50% |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate above base rate under option 2 (in hundredths) |  |  |  |  |  |  |  |  |  | 7.50% |  |  |  | 4.25% |  |  |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly principal payments |  |  |  |  |  |  |  |  |  |  |  | 600,000 | 1,350,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum aggregate level of liquidity financial covenant, added under sixth amendment |  |  |  |  |  |  | 27,000,000 | 26,000,000 | 25,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional borrowings |  |  |  |  |  |  |  |  |  |  | 20,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly principal payments, Seventh Amendment |  |  |  |  |  |  |  |  |  |  |  |  | 2,100,000 | 2,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding balance under revolving loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |  | 3,148,000 | 476,000 |  |  |  |  |  |  |  |  |  |
Amount available under revolving facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 16,225,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility available for accrued interest and other amounts payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000 |  |  |  |  |  |  |  |
Payment terms under the Strategic Cooperation Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 120 days |  |  |  |  |  |  |  |
Interest rate (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |
Interest rate applicable to unpaid amounts (per month) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.50% | 1.25% |  |  |  |  |  |
Payments of outstanding liabilities, including interest under the Guaranty |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,843,000 |  |  |  |  |  |  |  |  |
Number of shares that can be purchased under warrants (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 219,355 |  |  |  |  |  |  |  |  |  |  | 516,129 |  |  |  |  |
Initial exercise price (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7.75 |  |  |  |  |  |  |  |  |  |  | $ 7.75 |  |  |  |  |
Warrant term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 years |  |  |  |  |
Fair value of warrants issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,414,000 |  | 1,414,000 |  | 375,000 |  |  |  |  |  |  |  |  |  |  |  |  | 4,561,000 |  | 4,561,000 |  | 1,639,000
Total loss (gain) included in net loss | 2,391,000 | (67,000) | 3,961,000 | (57,000) |  |  |  |  |  |  |  |  |  |  | 609,000 | (260,000) | 1,039,000 | (250,000) |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,782,000 | 193,000 | 2,922,000 | 193,000 |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving loan - in default, deconsolidated |  |  |  |  | 48,520,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term loan - in default, deconsolidated |  |  |  |  | $ 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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