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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) |  |  |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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