Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 27, 2013	Sep. 27, 2013
Allowance for doubtful accounts	$ (901)	$ (514)
Class A Common Stock [Member]
Common stock, par value (usd per share)	$ 0.001	$ 0.001
Common stock voting right per share (votes per share)	1	1
Common stock, shares authorized (shares)	500,000,000	500,000,000
Common stock, shares issued (shares)	48,060,689	46,862,893
Common stock, shares outstanding (shares)	48,060,689	46,862,893
Class B Common Stock [Member]
Common stock, par value (usd per share)	$ 0.001	$ 0.001
Common stock voting right per share (votes per share)	10	10
Common stock, shares authorized (shares)	500,000,000	500,000,000
Common stock, shares issued (shares)	53,969,786	54,876,494
Common stock, shares outstanding (shares)	53,969,786	54,876,494