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Debt, Credit Facility (Details) - USD ($)
12 Months Ended
Apr. 30, 2017
Mar. 31, 2017
Mar. 31, 2016
May 31, 2016
Apr. 30, 2016
Aug. 31, 2012
Summarized information about the term loan [Abstract]            
Less current portion of term loan   $ (3,064,000) $ (3,067,000)      
Long-term portion of term loan   16,935,000 $ 19,980,000      
Credit Facility [Member]            
Credit Facility [Abstract]            
Maximum borrowing capacity   $ 125,000,000        
Debt instrument, maturity date   Jun. 03, 2020        
Credit Facility [Member] | Minimum [Member]            
Credit Facility [Abstract]            
Facility fee on total leverage ratio   0.25%        
Credit Facility [Member] | Maximum [Member]            
Credit Facility [Abstract]            
Dividend payments, annual maximum amount permitted   $ 10,000,000        
Facility fee on total leverage ratio   0.375%        
Credit Facility [Member] | Maximum [Member] | Subsequent Event [Member]            
Credit Facility [Abstract]            
Dividend payments, annual maximum amount permitted $ 15,000,000          
Credit Facility [Member] | Reference Rate [Member]            
Credit Facility [Abstract]            
Reference interest rate under option 1, floor   1.50%        
Interest rate over LIBOR rate under option 1   1.75%        
Interest rate above base rate under option 2   2.00%        
Credit Facility [Member] | LIBOR [Member]            
Credit Facility [Abstract]            
Reference interest rate under option 1, floor   2.50%        
Interest rate over LIBOR rate under option 1   2.75%        
Interest rate above base rate under option 2   3.00%        
Credit Facility [Member] | Term Loans [Member]            
Credit Facility [Abstract]            
Maximum borrowing capacity   $ 25,000,000        
Quarterly principal payments   $ 781,250        
Interest rate at end of period   3.29% 2.94%      
Summarized information about the term loan [Abstract]            
Principal amount of term loan   $ 20,312,000 $ 23,438,000      
Unamortized financing fees   (313,000) (391,000)      
Net carrying amount of term loan   19,999,000 23,047,000      
Less current portion of term loan   (3,064,000) (3,067,000)      
Long-term portion of term loan   16,935,000 19,980,000      
Future repayments of the Amended Term Loan, by fiscal year [Abstract]            
2018   3,125,000        
2019   3,125,000        
2020   3,125,000        
2021   10,937,000        
Total payments   $ 20,312,000 $ 23,438,000      
Credit Facility [Member] | Revolving Facility [Member]            
Credit Facility [Abstract]            
Maximum borrowing capacity       $ 120,000,000 $ 100,000,000  
Interest rate at end of period   3.55% 3.53%      
Future repayments of the Amended Term Loan, by fiscal year [Abstract]            
Outstanding balance under revolving loan   $ 11,000,000 $ 7,000,000      
Amount available under revolving facility   108,140,000        
Credit Facility [Member] | Revolving Facility [Member] | Letter of Credit [Member]            
Credit Facility [Abstract]            
Maximum borrowing capacity   15,000,000   $ 15,000,000    
Credit Facility [Member] | Revolving Facility [Member] | Commercial Letter of Credit [Member]            
Future repayments of the Amended Term Loan, by fiscal year [Abstract]            
Outstanding balance under revolving loan   600,000        
Credit Facility [Member] | Revolving Facility [Member] | Standby Letters of Credit [Member]            
Future repayments of the Amended Term Loan, by fiscal year [Abstract]            
Outstanding balance under revolving loan   260,000        
WX Agreement [Member] | Supplier Warrant [Member]            
WX Agreement [Abstract]            
Number of shares that can be purchased under warrants (in shares)           516,129
Initial exercise price (in dollars per share)           $ 7.75
Fair value of warrants issued   11,879,000 15,643,000      
Total gain (loss) included in net loss   $ 3,764,000 $ (5,137,000)