Commitments (Details 2)	1 Months Ended	12 Months Ended
	Sep. 30, 2009	Dec. 29, 2012
401(k) plan disclosures
Maximum percentage of pre-tax earnings that the eligible employees may contribute to the plan		50.00%
Period of employment prior to change for making matching contributions as a specified percentage of employees' pre-tax contributions	1 year
Employer matching contribution as a percentage of participants first pre-tax contributions	18.00%
Participants first pre-tax contributions (as a percent)	15.00%
Vesting percentage of matching contributions	20.00%
Period of service for fully vesting of employer matching contribution	5 years