Accrued Expenses (Details) (USD $)	12 Months Ended		3 Months Ended
	Dec. 28, 2013	Dec. 29, 2012	Mar. 30, 2014 Subsequent event
Accrued Expenses
Compensation and related expenses	$ 51,960,000	$ 40,329,000
Income taxes payable	3,503,000	626,000
Other	10,194,000	4,350,000
Total	65,657,000	45,305,000
Accrued bonuses	40,000,000	28,000,000
Forgivable loans issuable to future employees for future service	5,000,000
Accrued Expenses
Forgivable loans issued to future employees for future service	$ 38,800,000	$ 20,700,000	$ 5,000,000