Roll Forward of Activity for Company's Restructuring Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 23, 2013	Dec. 29, 2012
2010 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Charges incurred	$ 149
2010 Restructuring Plan | Accrued Liabilities
Restructuring Cost and Reserve [Line Items]
Beginning balance	2,739	3,800
Charges incurred		386
Cash payments	(640)	(1,322)
Non-cash	(2)	(125)
Ending balance	2,097	2,739
2011 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Charges incurred	1,182
2011 Restructuring Plan | Accrued Liabilities
Restructuring Cost and Reserve [Line Items]
Beginning balance	1,602	4,429
Charges incurred		2,926
Cash payments	(140)	(5,741)
Non-cash	(19)	(12)
Ending balance	1,443	1,602
Severance and other employee-related costs | 2010 Restructuring Plan | Accrued Liabilities
Restructuring Cost and Reserve [Line Items]
Beginning balance		85
Charges incurred		298
Cash payments		(258)
Non-cash		(125)
Severance and other employee-related costs | 2011 Restructuring Plan | Accrued Liabilities
Restructuring Cost and Reserve [Line Items]
Beginning balance		194
Charges incurred		389
Cash payments		(165)
Ending balance	418	418
Contract Termination and Other Costs | 2010 Restructuring Plan | Accrued Liabilities
Restructuring Cost and Reserve [Line Items]
Beginning balance	2,739	3,715
Charges incurred		88
Cash payments	(640)	(1,064)
Non-cash	(2)
Ending balance	2,097	2,739
Contract Termination and Other Costs | 2011 Restructuring Plan | Accrued Liabilities
Restructuring Cost and Reserve [Line Items]
Beginning balance	1,184	4,235
Charges incurred		2,537
Cash payments	(140)	(5,576)
Non-cash	(19)	(12)
Ending balance	$ 1,025	$ 1,184