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Long-Term Debt (Details Textual) (USD $)	12 Months Ended			12 Months Ended			12 Months Ended				0 Months Ended
	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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Total initial amount borrowed under secured long term debt facility.

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Maximum contractual interest rate for funds borrowed, under the debt agreement.

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