Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 29, 2017	Sep. 30, 2016
Intangible Assets By Major Class [Line Items]
Amortized Intangible Assets, Gross Carrying Amount	$ 731,132	$ 709,488
Accumulated Amortization	413,378	356,251
Trademarks
Intangible Assets By Major Class [Line Items]
Indefinite-lived Intangible Assets, Gross Carrying Amount	$ 41,412	39,798
Programs
Intangible Assets By Major Class [Line Items]
Amortized Intangible Assets, Weighted Average Years Useful Life	16 years
Amortized Intangible Assets, Gross Carrying Amount	$ 625,470	607,276
Accumulated Amortization	$ 339,920	293,223
Core Technology
Intangible Assets By Major Class [Line Items]
Amortized Intangible Assets, Weighted Average Years Useful Life	12 years
Amortized Intangible Assets, Gross Carrying Amount	$ 15,926	15,926
Accumulated Amortization	$ 13,123	11,778
Patents and Other
Intangible Assets By Major Class [Line Items]
Amortized Intangible Assets, Weighted Average Years Useful Life	12 years
Amortized Intangible Assets, Gross Carrying Amount	$ 89,736	86,286
Accumulated Amortization	$ 60,335	$ 51,250