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Interim Condensed Consolidated Balance Sheets (Parenthetical)
$ in Thousands
Apr. 01, 2016
USD ($)
vote / shares
$ / shares
shares
Sep. 25, 2015
USD ($)
vote / shares
$ / shares
shares
Allowance for doubtful accounts | $ $ (2,665) $ (1,542)
Class A Common Stock [Member]    
Common stock, par value (usd per share) | $ / shares $ 0.001 $ 0.001
Common stock voting right per share (votes per share) | vote / shares 1 1
Common stock, shares authorized (shares) 500,000,000 500,000,000
Common stock, shares issued (shares) 53,265,096 50,291,426
Common stock, shares outstanding (shares) 53,265,096 50,291,426
Class B Common Stock [Member]    
Common stock, par value (usd per share) | $ / shares $ 0.001 $ 0.001
Common stock voting right per share (votes per share) | vote / shares 10 10
Common stock, shares authorized (shares) 500,000,000 500,000,000
Common stock, shares issued (shares) 46,790,462 50,743,311
Common stock, shares outstanding (shares) 46,790,462 50,743,311