Sum of the carrying values as of the balance sheet date of obligations incurred through that date and due within one year (or the operating cycle, if longer), including liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received, taxes, interest, rent and utilities, accrued salaries and bonuses, payroll taxes and fringe benefits.

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Stock Based Compensation (Narrative) (Details) (USD $)	9 Months Ended
Stock Based Compensation (Narrative) (Details) (USD $)	Feb. 28, 2015	Mar. 01, 2014	May 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Accounts payable and accrued expenses	$ 76,916,000		$ 69,937,000
Stock based compensation expense (benefit)	1,700,000	1,000,000
Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Accounts payable and accrued expenses	1,100,000		1,100,000
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense	$ 6,100,000
Weighted average period of unrecognized compensation expense	2 years 3 months 18 days