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Long-Term Debt (Details Textual) |  | 12 Months Ended |
--- | --- | --- | ---
Sep. 19, 2013 USD ($) | May 31, 2016 USD ($) | May 31, 2015 USD ($)
Debt Instrument [Line Items] |  |  |
Senior secured term loan facility | $ 100,000,000 |  |
Senior secured revolving credit facility | $ 100,000,000 |  |
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 increase in interest | 2.00% |  |
Notional amount of interest rate swap agreement |  | $ 100,000,000 |
Fixed interest rate payments |  | 0.74% |
Loans payable, noncurrent |  | $ 105,160,000 | $ 128,910,000
Ratio for debt service coverage |  | 1.35 |
Ratio of indebtedness to consolidated EBITDA |  | 3.75 |
Revolving Credit Facility |  |  |
Debt Instrument [Line Items] |  |  |
Loans payable, noncurrent |  |  | $ 36,400,000
Term Loan |  |  |
Debt Instrument [Line Items] |  |  |
Loans payable |  | $ 85,000,000 |
Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Commitment fee percentage | 0.35% |  |
Maximum | Line of Credit |  |  |
Debt Instrument [Line Items] |  |  |
State interest rate | 2.25% |  |
Maximum | Term Loan |  |  |
Debt Instrument [Line Items] |  |  |
State interest rate | 1.25% |  |
Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Commitment fee percentage | 0.20% |  |
Minimum | Line of Credit |  |  |
Debt Instrument [Line Items] |  |  |
State interest rate | 1.50% |  |
Minimum | Term Loan |  |  |
Debt Instrument [Line Items] |  |  |
State interest rate | 0.50% |  |
Interest rate swap agreements |  |  |
Debt Instrument [Line Items] |  |  |
Fixed interest rate payments |  | 3.26% |
Letter of Credit |  |  |
Debt Instrument [Line Items] |  |  |
Credit facility borrowing capacity | $ 20,000,000 |  |
Swingline Loans |  |  |
Debt Instrument [Line Items] |  |  |
Credit facility borrowing capacity | 5,000,000 |  |
Revolving Credit Facility |  |  |
Debt Instrument [Line Items] |  |  |
Borrowing under revolving facility | $ 41,400,000 |  |

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