Goodwill and Intangible Assets - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended			9 Months Ended
	Jun. 28, 2014	Mar. 29, 2014	Jun. 29, 2013	Jun. 28, 2014	Jun. 29, 2013
Finite-Lived Intangible Assets [Line Items]
Impairment charges		$ 27.1
Impairment of intangible assets	0		1.7	26.6	1.7
Developed Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment charges		26.6
Impairment of intangible assets					1.7
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment charges		$ 0.5