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Long-Term Debt (Details Textual) - USD ($) |  | 12 Months Ended |
--- | --- | --- | ---
Nov. 07, 2016 | May 31, 2018 | May 31, 2017 | May 31, 2016 | May 24, 2018
Debt Instrument [Line Items] |  |  |  |  |
Proceeds from issuance of and borrowings on long-term debt |  | $ 0 | $ 116,471,000 | $ 0 |
Repayment of long-term debt |  | $ (5,000,000) | $ (140,381,000) | $ (16,250,000) |
JPMorgan Chase Bank, N.A., Bank of America, N.A., Keybank National Association | Line of Credit |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, term | 5 years |  |  |  |
State interest rate |  | 3.41% |  |  |
Percentage of increase in interest | 2.00% |  |  |  |
Debt instrument, maximum leverage ratio of total indebtedness to adjusted EBITDA | 3.5 |  |  |  |
Debt instrument, maximum leverage ratio of total indebtedness to adjusted EBITDA, following material acquisitions | 3.75 |  |  |  |
Ratio for debt service coverage | 1.25 |  |  |  |
Maximum cash amount that can be utilized to calculate net debt | $ 10,000,000.0 |  |  |  | $ 20,000,000.0
JPMorgan Chase Bank, N.A., Bank of America, N.A., Keybank National Association | Line of Credit | Maximum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Commitment fee percentage | 0.35% |  |  |  |
JPMorgan Chase Bank, N.A., Bank of America, N.A., Keybank National Association | Line of Credit | Minimum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Commitment fee percentage | 0.20% |  |  |  |
JPMorgan Chase Bank, N.A., Bank of America, N.A., Keybank National Association | Line of Credit | Base Rate | Maximum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
State interest rate | 1.25% |  |  |  |
JPMorgan Chase Bank, N.A., Bank of America, N.A., Keybank National Association | Line of Credit | Base Rate | Minimum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
State interest rate | 0.50% |  |  |  |
JPMorgan Chase Bank, N.A., Bank of America, N.A., Keybank National Association | Line of Credit | Eurodollar | Maximum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
State interest rate | 2.25% |  |  |  |
JPMorgan Chase Bank, N.A., Bank of America, N.A., Keybank National Association | Line of Credit | Eurodollar | Minimum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
State interest rate | 1.50% |  |  |  |
JPMorgan Chase Bank, N.A., Bank of America, N.A., Keybank National Association | Line of Credit | Former Credit Agreement |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Repayment of long-term debt | $ (116,500,000) |  |  |  |
JPMorgan Chase Bank, N.A., Bank of America, N.A., Keybank National Association | Line of Credit | Secured Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Credit facility borrowing capacity | 100,000,000 |  |  |  |
Proceeds from issuance of and borrowings on long-term debt | 100,000,000 |  |  |  |
JPMorgan Chase Bank, N.A., Bank of America, N.A., Keybank National Association | Line of Credit | Revolving Credit Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Credit facility borrowing capacity | 150,000,000 |  |  |  |
Proceeds from issuance of and borrowings on long-term debt | 16,500,000 |  |  |  |
JPMorgan Chase Bank, N.A., Bank of America, N.A., Keybank National Association | Line of Credit | Letter of Credit |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Credit facility borrowing capacity | 20,000,000 |  |  |  |
JPMorgan Chase Bank, N.A., Bank of America, N.A., Keybank National Association | Line of Credit | Bridge Loan |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Credit facility borrowing capacity | $ 5,000,000 |  |  |  |

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