Income Taxes (Details 4)	12 Months Ended
	Sep. 29, 2012 USD ($)	Sep. 29, 2012 CAD	Sep. 24, 2011 USD ($)	Sep. 25, 2010 USD ($)	Sep. 26, 2009 USD ($)
Income Taxes
Net operating loss carryforwards	$ 11,500,000
Capital loss carryforwards	17,700,000
Unrecognized tax benefits	23,956,000		24,419,000	5,480,000	444,000
Unrecognized tax benefits that would impact effective tax rate	20,400,000
Maximum amount of indemnification receivable recognized	16,600,000	37,900,000
Accrued interest and penalties	600,000		500,000
Income tax expense	$ 200,000