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Long-Term Debt (Details Textual) (USD $) | 12 Months Ended |  |  | 12 Months Ended |  | 12 Months Ended |  | 0 Months Ended
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May 31, 2014 | Sep. 19, 2013 | May 31, 2013 | May 31, 2014 Line of Credit [Member] | May 31, 2014 Term Loan [Member] | May 31, 2013 Term Loan [Member] | May 31, 2014 Maximum [Member] | May 31, 2014 Minimum [Member] | Sep. 19, 2013 Letter of Credit [Member] | Sep. 19, 2013 Swingline Loans [Member] | Sep. 19, 2013 Revolving Credit Facility [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Senior secured term loan facility |  | $ 100,000,000 |  |  |  |  |  |  |  |  |
Senior secured revolving credit facility |  | 100,000,000 |  |  |  |  |  |  |  |  |
Credit facility borrowing capacity |  |  |  |  |  |  |  |  | 20,000,000 | 5,000,000 |
Bank credit agreement maturity period | P5Y |  |  |  |  |  |  |  |  |  |
Quarterly percentage repayment of term facility year one | 5.00% |  |  |  |  |  |  |  |  |  |
Quarterly percentage repayment of term facility year two | 5.00% |  |  |  |  |  |  |  |  |  |
Quarterly percentage repayment of term facility year three | 10.00% |  |  |  |  |  |  |  |  |  |
Quarterly percentage repayment of term facility year four | 15.00% |  |  |  |  |  |  |  |  |  |
Quarterly percentage repayment of term facility year five | 65.00% |  |  |  |  |  |  |  |  |  |
Percentage of increases leverage ratio base rate, minimum |  |  |  | 1.50% | 0.50% |  |  |  |  |  |
Percentage of increases leverage ratio base rate, maximum |  |  |  | 2.25% | 1.25% |  |  |  |  |  |
Percentage of increase in interest | 2.00% |  |  |  |  |  |  |  |  |  |
Commitment fee percentage |  |  |  |  |  |  | 0.35% | 0.20% |  |  |
Notional amount of interest rate swap agreement | 100,000,000 |  |  |  |  |  |  |  |  |  |
Fixed interest rate payments | 0.74% |  |  |  |  |  |  |  |  |  |
Borrowing under Revolving Facility |  |  |  |  |  |  |  |  |  |  | 41,400,000
Loans payable, noncurrent | $ 91,250,000 |  | $ 135,000,000 |  |  | $ 46,410,000 |  |  |  |  |
Ratio for debt service coverage | 1.35 |  |  |  |  |  |  |  |  |  |
Ratio of indebtedness to consolidated EBITDA | 3.75 |  |  |  |  |  |  |  |  |  |

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- Definition Disclosure of timing of required repayments, sinking fund requirements, and other redeemable securities at fixed or determinable prices and dates in the five years immediately following the date of the latest balance sheet presented in the financial statements, and the amount thereafter to fully repay the principal of long-term debt. These disclosures may be made either on an individual debt or security basis, by type of debt or security basis, or on a combined basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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