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INCOME TAXES - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2015
Income Tax Disclosure [Abstract] |  |  |
Federal statutory rate (as a percent) | 35.00% |  |
Increase in balances related to tax positions taken in prior period | $ 243 | $ 411 | $ 0
Total unrecognized tax benefit including interest and penalties | 34,000 |  |
Accrued interest and penalties | 1,300 |  |
Income Tax Examination [Line Items] |  |  |
Federal net operating loss | 295,800 |  |
Tax credit carryforwards | 91,300 |  |
Federal net operating loss carryforwards attributable to excess tax deductions from stock option exercises | 34,300 |  |
Acquired net operating losses included in carryforwards | 11,100 |  |
Acquired credits included in carryforwards | $ 9,600 |  |
Minimum |  |  |
Income Tax Examination [Line Items] |  |  |
Open years | 3 years |  |
Maximum |  |  |
Income Tax Examination [Line Items] |  |  |
Open years | 5 years |  |

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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32698-109319 + Details
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