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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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