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Debt (Details) (USD $)
12 Months Ended 0 Months Ended 6 Months Ended 40 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 1 Months Ended 40 Months Ended 0 Months Ended 3 Months Ended 12 Months Ended 0 Months Ended 60 Months Ended 0 Months Ended 0 Months Ended 1 Months Ended 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
May 31, 2013
Fenco [Member]
May 24, 2012
Financing Agreement [Member]
Term Loans [Member]
Sep. 30, 2013
Financing Agreement [Member]
Term Loans [Member]
Jan. 17, 2017
Financing Agreement [Member]
Term Loans [Member]
Mar. 31, 2014
Financing Agreement [Member]
Term Loans [Member]
Mar. 31, 2013
Financing Agreement [Member]
Term Loans [Member]
Nov. 22, 2013
Financing Agreement [Member]
Term Loans [Member]
Cerberus Warrant [Member]
Mar. 31, 2014
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]
May 24, 2012
Financing Agreement [Member]
Revolving Facility [Member]
Mar. 31, 2014
Financing Agreement [Member]
Revolving Facility [Member]
Mar. 31, 2013
Financing Agreement [Member]
Revolving Facility [Member]
Mar. 31, 2014
Financing Agreement [Member]
Revolving Facility [Member]
Letter of Credit [Member]
Mar. 31, 2014
Financing Agreement [Member]
Revolving Facility [Member]
Commercial Letter Of Credit [Member]
Mar. 31, 2014
Financing Agreement [Member]
Revolving Facility [Member]
Standby Letters of Credit [Member]
Aug. 30, 2013
Financing Agreement [Member]
Sixth Amendment [Member]
Jul. 31, 2013
Financing Agreement [Member]
Sixth Amendment [Member]
Jun. 28, 2013
Financing Agreement [Member]
Sixth Amendment [Member]
Aug. 31, 2013
Financing Agreement [Member]
Seventh Amendment [Member]
Term Loans [Member]
Jan. 17, 2017
Financing Agreement [Member]
Seventh Amendment [Member]
Term Loans [Member]
Nov. 06, 2013
Financing Agreement [Member]
Ninth Amendment [Member]
Jan. 18, 2014
Financing Agreement [Member]
Ninth Amendment [Member]
Jan. 18, 2015
Financing Agreement [Member]
Ninth Amendment [Member]
Nov. 06, 2013
Financing Agreement [Member]
Ninth Amendment [Member]
Term Loans [Member]
Nov. 06, 2018
Financing Agreement [Member]
Ninth Amendment [Member]
Term Loans [Member]
Mar. 31, 2014
Financing Agreement [Member]
Ninth Amendment [Member]
Term Loans [Member]
Mar. 31, 2013
Financing Agreement [Member]
Ninth Amendment [Member]
Term Loans [Member]
Nov. 06, 2013
Financing Agreement [Member]
Ninth Amendment [Member]
Revolving Facility [Member]
Mar. 31, 2014
Financing Agreement [Member]
Ninth Amendment [Member]
Revolving Facility [Member]
Aug. 26, 2013
WX Agreement [Member]
Aug. 31, 2012
WX Agreement [Member]
Jun. 10, 2014
WX Agreement [Member]
Dec. 10, 2013
WX Agreement [Member]
Mar. 31, 2014
WX Agreement [Member]
Supplier Warrant [Member]
Mar. 31, 2013
WX Agreement [Member]
Supplier Warrant [Member]
Aug. 31, 2012
WX Agreement [Member]
Supplier Warrant [Member]
Debt Instrument [Line Items]                                                                                
Maximum borrowing capacity         $ 85,000,000                 $ 20,000,000     $ 10,000,000                     $ 95,000,000       $ 30,000,000     $ 22,000,000          
Debt instrument, maturity date         Jan. 17, 2017                 Jan. 17, 2017                           Nov. 06, 2018       Nov. 06, 2018     Jul. 31, 2017          
Reference interest rate under option 1         LIBOR                                             LIBOR       LIBOR                
Reference interest rate under option 1, floor (in hundredths)                                                       1.50%                        
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                                 2,100,000         2,100,000                      
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                                  
Increase (decrease) in maximum borrowing capacity                                                       (10,000,000)       10,000,000                
Maximum amount of equity interests that may be repurchased                                                 10,000,000                              
Interest rate at end of period using LIBOR option (in hundredths)                                                           6.75% 10.50%   2.66%              
Summarized information about the term loan [Abstract]                                                                                
Principal amount of term loan               92,900,000 84,500,000                                                              
Unamortized financing fees               (5,623,000) (2,595,000)                                                              
Net carrying amount of term loan               87,277,000 81,905,000                                                              
Less current portion of term loan (7,843,000) (3,775,000)           (7,843,000) (3,775,000)                                                              
Long-term portion of term loan 79,434,000 78,130,000           79,434,000 78,130,000                                                              
Future repayments of the Amended Term Loan, by fiscal year [Abstract]                                                                                
2015               8,400,000                                                                
2016               8,400,000                                                                
2017               8,400,000                                                                
2018               8,400,000                                                                
2019               59,300,000                                                                
Prepayment penalty (in hundredths)                                                   3.00% 2.00%                          
Maximum amount that can be prepaid within specified number of days subsequent to amendment effective date without prepayment penalty                                                 10,000,000                              
Number of days that prepayment penalty is waived for specified prepayment amount                                                 120 days                              
Outstanding balance under revolving loan                             10,000,000 0   1,614,000 476,000                                          
Amount available under revolving facility                             17,720,000                                                  
Credit facility available for accrued interest and other amounts payable                                                                     2,000,000          
Payment terms under the WX 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
Amount paid to repurchase warrants 2,194,000 0 0             2,194,000                                                            
Closing price of common stock on repurchase date (in dollars per share) $ 26.57                 $ 17.75                                                            
Adjusted exercise price (in dollars per share)                   $ 7.75                                                            
Difference between closing price of common stock on repurchase date less the adjusted exercise price (in dollars per share)                   $ 10.00                                                            
Fair value assumptions of warrants [Abstract]                                                                                
Dividend yield (in hundredths)                   0.00%                                                            
Expected volatility (in hundredths)                   45.69%                                                            
Risk-free interest rate (in hundredths)                   0.77%                                                            
Subsequent financing probability (in hundredths)                   0.00%                                                            
Expected life                   3 years 6 months                                                            
Gain on extinguishment of warrant liability 216,000 0 0               216,000                                                          
Fair value of warrants issued                   2,410,000   375,000                                                   10,047,000 1,639,000  
Total loss (gain) included in net loss 10,443,000 389,000 0               2,035,000 (232,000)                                                   8,408,000 621,000  
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