Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 26, 2015	Sep. 26, 2015	Dec. 27, 2014
Accounts receivable allowance for doubtful accounts	$ 21,213	$ 19,296	$ 24,184
Common Stock [Member]
Common stock, par value	$ 0.01	$ 0.01	$ 0.01
Common stock, shares outstanding	11,908,317	11,908,317	12,220,627
Class A Common Stock [Member]
Common stock, par value	$ 0.01	$ 0.01	$ 0.01
Common stock, shares outstanding	36,591,487	36,462,299	36,445,726
Class B Stock [Member]
Common stock, par value	$ 0.01	$ 0.01	$ 0.01
Common stock, shares outstanding	1,652,262	1,652,262	1,652,262