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Goodwill and Other Intangibles - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	4 Months Ended
	Apr. 20, 2013	Apr. 21, 2012	Dec. 29, 2012
Goodwill and Intangible Assets Disclosure [Line Items]
Additional indefinite lived intangible assets separately identified from goodwill	$ 266.0		$ 186.5
Net amortization expense, Total	$ 3.4	$ 2.5

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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