Goodwill and Intangible Assets - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	1 Months Ended		3 Months Ended	9 Months Ended
	Apr. 29, 2012	Oct. 17, 2011	Dec. 24, 2011	Jun. 23, 2012
Goodwill And Other Intangibles [Line Items]
Goodwill impairment test sensitivity disclosure threshold				10.00%
Damages awarded by jury	$ 18.8	$ 18.8	$ 18.8
Minimum [Member]
Goodwill And Other Intangibles [Line Items]
Estimated useful life of intangible assets, in years				2 years
Maximum [Member]
Goodwill And Other Intangibles [Line Items]
Estimated useful life of intangible assets, in years				30 years