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NET INCOME (LOSS) PER SHARE | 12 Months Ended
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Mar. 31, 2017
Earnings Per Share [Abstract] |
NET INCOME (LOSS) PER SHARE | NET INCOME (LOSS) PER SHARE Equity Instruments Outstanding We have stock options and restricted stock units granted under various stock incentive plans that, upon exercise and vesting, respectively, would increase shares outstanding. We have 4.50% convertible subordinated notes which are convertible at the option of the holders at any time prior to maturity into shares of Quantum common stock at a conversion price of $13.20 per share. We also had 3.50% convertible subordinated notes outstanding as of March 31, 2015, which were convertible at the option of the holders at any time prior to maturity into shares of Quantum common stock at a conversion price of $34.64 per share. Both the 4.50% and 3.50% notes, if converted, would increase shares outstanding. Net Income (Loss) per Share The following table sets forth the computation of basic and diluted net income (loss) per share, as adjusted for the Reverse Stock Split, (in thousands, except per-share data):
| For the year ended March 31,
| 2017 |  | 2016 |  | 2015
Numerator: |  |  |  |  |
Net income (loss) | $ | 3,645 |  |  | $ | (76,394 | ) |  | $ | 17,083 |
Denominator: |  |  |  |  |
Weighted average shares: |  |  |  |  |
Basic | 33,742 |  |  | 32,841 |  |  | 31,833 |
Dilutive shares from stock plans | 371 |  |  | — |  |  | 670 |
Diluted | 34,113 |  |  | 32,841 |  |  | 32,503 |
Basic net income (loss) per share | $ | 0.11 |  |  | $ | (2.33 | ) |  | $ | 0.54 |
Diluted net income (loss) per share | $ | 0.11 |  |  | $ | (2.33 | ) |  | $ | 0.53 |
Dilutive and potentially dilutive common shares from stock incentive plans are determined by applying the treasury stock method to the assumed exercise of outstanding options and the assumed vesting of outstanding restricted stock units. The dilutive impact related to our convertible subordinated notes is determined by applying the if-converted method, which includes adding the related weighted average shares to the denominator and the related interest expense to net income. The computations of diluted net income (loss) per share for the periods presented exclude the following because the effect would have been anti-dilutive (in millions):
| For the year ended March 31,
| 2017 |  | 2016 |  | 2015
Weighted average shares excluded: |  |  |  |  |
4.50% convertible subordinated notes | 5.1 |  |  | 5.3 |  |  | 5.3 |
3.50% convertible subordinated notes | — |  |  | 1.3 |  |  | 3.6 |
Stock options | 0.2 |  |  | 0.6 |  |  | 0.3 |
Unvested restricted stock units | 0.4 |  |  | 1.5 |  |  | — |
Interest expense excluded: |  |  |  |  |
4.50% convertible subordinated notes | 0.4 |  |  | 0.5 |  |  | 0.5 |
3.50% convertible subordinated notes | — |  |  | 0.2 |  |  | 0.7 |

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1278-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1252-109256 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=65016374&loc=d3e4984-109258 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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