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Commitments and Contingencies (Details)
3 Months Ended
Oct. 18, 2015
USD ($)
Oct. 24, 2014
USD ($)
Dec. 05, 2013
state
Jun. 30, 2012
USD ($)
Other Commitments [Line Items]        
Rent expense $ 912,000 $ 1,143,000    
Annual Minimum Royalty Payment [Member] | Patent License And Technology Transfer Arrangement [Member] | Imricor Medical Systems - MRI technology [Member]        
Other Commitments [Line Items]        
Other commitment       $ 50,000
Milestone Payment [Member] | Patent License And Technology Transfer Arrangement [Member] | Imricor Medical Systems - MRI technology [Member]        
Other Commitments [Line Items]        
Other commitment $ 1,000,000      
Federal False Claims Act [Member]        
Other Commitments [Line Items]        
False claim statues, number of states | state     28