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Acquisitions and divestitures (Details Textuals 2) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Sep. 28, 2013
Sep. 29, 2012
Jun. 29, 2013
Internix, inc [Member]
Business Acquisition [Line Items]      
Number of businesses acquired 2    
Aggregate consideration for acquisitions $ 25,509    
Gain on bargain purchase $ 0 $ 31,291 $ 32,679
Gain on bargain purchase per share on a diluted basis     $ 0.23