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Total intrinsic value of options (Details) (USD $)
Jun. 30, 2013
Jun. 24, 2012
Total intrinsic value of options    
Weighted-average fair value of options granted during the year $ 1.29 $ 1.90
Total intrinsic value of options exercised   $ 38,320
Total intrinsic value of options outstanding in millions 2.7  
Total intrinsic value of options exercisable in millions 1.5