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Income Taxes (Details Textual) - USD ($) | 3 Months Ended | 5 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Feb. 28, 2018 | May 31, 2018 | May 31, 2018 | May 31, 2017 | May 31, 2016
Income Taxes (Textual) [Abstract] |  |  |  |  |
Tax benefit due to revaluation of indefinite lived deferred tax liability | $ 9,300,000 | $ 9,300,000 |  |  |
Estimated blended corporate income tax rate (as percent) |  |  | 28.60% |  |
Tax benefit |  | 3,000,000 |  |  |
Foreign subsidiary undistributed earnings |  | 4,900,000 | $ 4,900,000 | $ 5,300,000 |
Additional unrecognized tax benefit |  | 500,000 | 500,000 |  |
Accrued interest and penalties |  | 0 | 0 | $ 0 | $ 0
Federal |  |  |  |  |
Income Taxes (Textual) [Abstract] |  |  |  |  |
Net operating loss carryforwards after considering limitations of use |  | 157,800,000 | 157,800,000 |  |
Tax Year 2018 To 2023 | Federal |  |  |  |  |
Income Taxes (Textual) [Abstract] |  |  |  |  |
Federal and State net operating loss carryforwards |  | 28,800,000 | 28,800,000 |  |
Tax Year 2027 To 2037 | Federal |  |  |  |  |
Income Taxes (Textual) [Abstract] |  |  |  |  |
Net operating loss carryforwards after considering limitations of use |  | 129,000,000 | 129,000,000 |  |
Tax Year 2018 To 2038 | State |  |  |  |  |
Income Taxes (Textual) [Abstract] |  |  |  |  |
Federal and State net operating loss carryforwards |  | $ 19,100,000 | $ 19,100,000 |  |

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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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