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Capital Lease Obligation (Details Textual) (USD $)
3 Months Ended
Aug. 30, 2012
Aug. 30, 2012
Furniture and Fixtures [Member]
Aug. 30, 2012
Digital Systems [Member]
May 31, 2012
Digital Systems [Member]
Capital Leased Assets, Number of Units 632      
Capital Leases, Balance Sheet, Assets by Major Class, Net   $ 44,830,000   $ 43,878,000
Finite-Lived Intangible Assets, Accumulated Amortization     4,044,000 2,933,000
Commitment Minimum Lease Payments 6,067,000      
Payments Obligation Reduced Amount $ 4,287,000      
Expect Period Of Payments Obligation 12 months