Interim Condensed Consolidated Balance Sheets (Parenthetical) $ in Thousands	Jul. 01, 2016 USD ($) vote / shares $ / shares shares	Sep. 25, 2015 USD ($) vote / shares $ / shares shares
Allowance for doubtful accounts | $	$ (2,534)	$ (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)	54,978,917	50,291,426
Common stock, shares outstanding (shares)	54,978,917	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)	45,888,962	50,743,311
Common stock, shares outstanding (shares)	45,888,962	50,743,311