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DEBT - Narrative (Details) |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Oct. 21, 2016 USD ($) | Dec. 31, 2012 USD ($) $ / shares | Mar. 31, 2017 USD ($) $ / shares | Mar. 31, 2017 USD ($) $ / shares | Mar. 31, 2016 USD ($) | Mar. 31, 2015 USD ($) $ / shares | Dec. 31, 2016 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt issuance fees | $ 4,700,000 |  | $ 4,700,000 | $ 4,700,000 |  |  |
Gain (loss) on debt extinguishment |  |  |  | 41,000 | $ 394,000 | $ 1,295,000 |
Deposits | 1,000,000 |  |  |  |  |  |
Long-term debt |  |  | 131,590,000 | 131,590,000 |  |  |
Credit agreement |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt issuance fees | 3,100,000 |  |  |  |  |  |
Reserve requirement |  |  | 20,000,000.0 | 20,000,000.0 |  |  | $ 20,000,000
Debt discount | 1,000,000 |  |  |  |  |  |
Loan commitment fee | 600,000 |  |  |  |  |  |
Credit agreement | Letter of credit |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term debt | 1,000,000 |  |  |  |  |  |
Term loan agreement |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Aggregate principal amount |  |  | $ 50,000,000 | $ 50,000,000 | 0 |  |
4.50% convertible subordinated notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Aggregate principal amount |  | $ 70,000,000 |  |  |  |  |
Stated interest rate (as a percent) |  | 4.50% | 4.50% | 4.50% |  |  | 4.50%
Conversion ratio |  | 75.896 |  |  |  |  |
Conversion ratio applied per principal amount |  | $ 1,000 |  |  |  |  |
Conversion price (usd per share) | $ / shares |  | $ 13.20 | $ 13.2 | $ 13.2 |  | $ 34.64 |
Debt issuance fees |  |  | $ 2,300,000 | $ 2,300,000 |  |  |
Quarterly repayment of original principal balance (percent) |  |  |  |  |  |  | 1.25%
4.50% convertible subordinated notes | Convertible subordinated debt |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate (as a percent) |  |  | 4.50% | 4.50% |  |  |
Extinguishment of debt |  |  | $ 6,900,000 |  |  |  |
Repayments of Subordinated Debt |  |  | 6,800,000 |  |  |  |
Gain (loss) on debt extinguishment |  |  | (100,000) |  |  |  |
Credit agreement with Wells Fargo |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Repayments of outstanding balance | 60,300,000 |  |  |  |  |  |
Credit agreement with Wells Fargo | Credit agreement |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Aggregate principal amount |  |  | 0 | $ 0 | 62,709,000 |  |
Credit agreement with Wells Fargo | Convertible subordinated debt |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Gain (loss) on debt extinguishment | 100,000 |  |  |  |  |  |
Term loan agreement |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt issuance fees |  |  | 1,200,000 | 1,200,000 |  |  |
Debt discount |  |  | 1,000,000 | 1,000,000 |  |  |
DDTL |  |  | 20,000,000 | $ 20,000,000 |  |  |
Interest rate during the period |  |  |  | 8.55% |  |  |
Term loan agreement | Federal funds rate |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate margin |  |  |  | 0.50% |  |  |
Term loan agreement | One month LIBOR |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate margin |  |  |  | 1.00% |  |  |
Term loan agreement | Base rate |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate margin |  |  |  | 3.00% |  |  |
Term loan agreement | Prime rate quoted by the Wall Street Journal | Minimum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate margin |  |  |  | 6.00% |  |  |
Term loan agreement | Prime rate quoted by the Wall Street Journal | Maximum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate margin |  |  |  | 7.25% |  |  |
Term loan agreement | LIBOR rate plus senior net leverage ratio | Minimum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate margin |  |  |  | 7.00% |  |  |
Term loan agreement | LIBOR rate plus senior net leverage ratio | Maximum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate margin |  |  |  | 8.25% |  |  |
Term loan agreement | Credit agreement |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Amount borrowed | 50,000,000.0 |  |  |  |  |  |
Revolving credit agreement |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt issuance fees | 1,900,000 |  |  |  |  |  |
Credit agreement commitment fee | $ 600,000 |  |  |  |  |  |
Line of credit facility, percent commitment fee on undrawn amounts | 0.375% |  |  |  |  |  |
Revolving credit agreement | Federal funds rate |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate margin | 0.50% |  |  |  |  |  |
Revolving credit agreement | One month LIBOR |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate margin | 1.00% |  |  |  |  |  |
Revolving credit agreement | One month LIBOR margin | Minimum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate margin | 1.50% |  |  |  |  |  |
Revolving credit agreement | One month LIBOR margin | Maximum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate margin | 2.50% |  |  |  |  |  |
Revolving credit agreement | Credit agreement |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Aggregate principal amount |  |  | 46,400,000 | $ 46,400,000 |  |  |
Amount borrowed | $ 26,000,000.0 |  |  |  |  |  |
Available uncommitted accordion | 20,000,000 |  |  |  |  |  |
Revolving credit agreement | Credit agreement | Revolving credit agreement |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Aggregate principal amount |  |  | $ 18,500,000 | $ 18,500,000 | $ 0 |  |
Restricted reserve funded amount | 10,000,000 |  |  |  |  |  |
Reserve requirement | 20,000,000.0 |  |  |  |  |  |
Line of credit facility, maximum borrowing amount | $ 80,000,000 |  |  |  |  |  |
Credit agreement interest rate |  |  | 3.86% | 3.86% |  |  |

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