Business Segments and Geographic Information - Revenues by Geography (Detail)	3 Months Ended		6 Months Ended
	Mar. 29, 2014	Mar. 30, 2013	Mar. 29, 2014	Mar. 30, 2013
Schedule Of Geographical Segments [Line Items]
Revenues	100.00%	100.00%	100.00%	100.00%
United States [Member]
Schedule Of Geographical Segments [Line Items]
Revenues	74.00%	75.00%	74.00%	74.00%
Europe [Member]
Schedule Of Geographical Segments [Line Items]
Revenues	15.00%	12.00%	15.00%	14.00%
Asia-Pacific [Member]
Schedule Of Geographical Segments [Line Items]
Revenues	7.00%	9.00%	7.00%	8.00%
All Others [Member]
Schedule Of Geographical Segments [Line Items]
Revenues	4.00%	4.00%	4.00%	4.00%