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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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Debt instrument increase in interest rate in case of default.

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Contractual interest rate for funds borrowed, under the debt agreement.

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