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Income Taxes (Details 4) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Feb. 29, 2016 | Nov. 30, 2015 | Aug. 31, 2015 | May 31, 2015 | Feb. 28, 2015 | Nov. 30, 2014 | Aug. 31, 2014 | Nov. 30, 2015 | Nov. 30, 2014 | Feb. 29, 2016 | Feb. 28, 2015 | May 31, 2016 | May 31, 2015 | May 31, 2014 | May 31, 2013 | May 31, 2012
Reasons for consolidated income tax provision |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective income tax rate |  |  | 35.00% |  |  |  | 35.00% |  |  |  |  | 35.00% |  |  |  |
Income tax (benefit) provision at statutory tax rate of 35% |  |  |  |  |  |  |  |  |  |  |  | $ (1,139) | $ (2,845) | $ 1,814 |  |
Effect of Graduated tax rates |  |  |  |  |  |  |  |  |  |  |  | 33 | 81 | (51) |  |
State income taxes, net of Federal tax benefit |  |  |  |  |  |  |  |  |  |  |  | (215) | (21) | 111 |  |
Impact of Non US operations |  |  |  |  |  |  |  |  |  |  |  | (162) | 133 | (27) |  |
Research and development tax credit |  |  |  |  |  |  |  |  |  |  |  | (499) | (604) | (236) |  |
Meals and entertainment |  |  |  |  |  |  |  |  |  |  |  | 329 | 0 | 0 |  |
Nondeductible interest on contingent payments |  |  |  |  |  |  |  |  |  |  |  | 262 | 265 | 540 |  |
Nontaxable gain on revaluation of contingent consideration liability |  |  |  |  |  |  |  |  |  |  |  | (170) | (3,102) | (1,734) |  |
Tax law change |  |  |  |  |  |  |  |  |  |  |  | 0 | (454) | 1,173 |  |
Adjustment to beginning of year valuation allowance |  |  |  |  |  |  |  |  |  |  |  | 40,685 | 0 | 0 |  |
Effect of elimination of ASC 718 APIC pool |  |  |  |  |  |  |  |  |  |  |  | 739 | 1,253 | 440 |  |
Nondeductible stock-based compensation |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 176 |  |
Other nondeductible expenses |  |  |  |  |  |  |  |  |  |  |  | 207 | 498 | 384 |  |
Overaccrual (underaccrual) of prior year Federal and state taxes |  |  |  |  |  |  |  |  |  |  |  | 356 | 38 | 249 |  |
Other |  |  |  |  |  |  |  |  |  |  |  | (89) | 15 | 0 |  |
Income tax expense/(benefit), Total | $ 351 | $ (337) | $ 70 | $ 740 | $ (7,599) | $ 1,304 | $ 812 | $ (267) | $ 2,116 | $ 84 | $ (5,483) | $ 40,337 | $ (4,743) | $ 2,839 | $ (286) | $ (322)

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