Summary of Significant Accounting Policies - Additional Information (Detail)	12 Months Ended
	Dec. 28, 2012
Summary Of Significant Accounting Policies [Line Items]
Measurement period for cash and cash equivalents	Three months or less
Building | Minimum
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life in years	25 years
Building | Maximum
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life in years	40 years
Building Improvements
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life in years	7 years
Leasehold Improvements | Minimum
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life in years	3 years
Leasehold Improvements | Maximum
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life in years	10 years
Equipment | Minimum
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life in years	3 years
Equipment | Maximum
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life in years	10 years