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Goodwill and Intangible Assets (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Feb. 28, 2015 | Nov. 30, 2014 | Aug. 31, 2014 | Nov. 30, 2014 | Feb. 28, 2015 | May 31, 2016 | May 31, 2015 | May 31, 2014 | May 31, 2013 | May 31, 2012 | Dec. 31, 2015
Goodwill and Intangible Assets (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Discount rate used in fair value calculation |  |  |  |  |  | 12.50% |  |  |  |  |
Capitalization rate |  |  |  |  |  | 8.50% |  |  |  |  |
Percentage of fair value, carrying value |  |  |  |  |  |  |  |  |  |  | 9.20%
Amortization expense | $ 5,188 | $ 4,011 | $ 4,037 | $ 8,048 | $ 13,236 | $ 17,964 | $ 17,966 | $ 16,562 | $ 16,599 | $ 9,393 |
Adjustment of goodwill and deferred tax liabilities |  |  |  |  |  |  | $ 800 |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |
Goodwill and Intangible Assets (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Estimates useful life of intangible assets other than goodwill |  |  |  |  |  | 18 years |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |
Goodwill and Intangible Assets (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Estimates useful life of intangible assets other than goodwill |  |  |  |  |  | 2 years |  |  |  |  |
Income Approach Valuation Technique |  |  |  |  |  |  |  |  |  |  |
Goodwill and Intangible Assets (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Weight assigned to valuation methods |  |  |  |  |  | 75.00% |  |  |  |  |
Market Approach Valuation Technique |  |  |  |  |  |  |  |  |  |  |
Goodwill and Intangible Assets (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Weight assigned to valuation methods |  |  |  |  |  | 25.00% |  |  |  |  |

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- Definition Fair Value Assumptions, Calculation Weighted Applied to Various Valuation Method + References No definition available. + Details
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- Definition Goodwill And Deferred Tax Liabilities, Purchase Accounting Adjustments + References No definition available. + Details
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- Definition Goodwill and intangible assets. + References No definition available. + Details
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- Definition Percentage of fair value exceeding its carrying value. + References No definition available. + Details
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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Ratio of the net operating income produced by an asset and its capital cost (original prices paid to buy the asset), used as an input to measure fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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