Business Segments and Geographic Information - Revenues by Geography (Detail)	3 Months Ended		6 Months Ended
	Mar. 26, 2022	Mar. 27, 2021	Mar. 26, 2022	Mar. 27, 2021
Schedule Of Geographical Segments [Line Items]
Revenues	100.00%	100.00%	100.00%	100.00%
United States
Schedule Of Geographical Segments [Line Items]
Revenues	69.10%	69.20%	69.00%	70.00%
Europe
Schedule Of Geographical Segments [Line Items]
Revenues	20.30%	21.90%	20.10%	21.40%
Asia-Pacific
Schedule Of Geographical Segments [Line Items]
Revenues	7.60%	5.90%	7.90%	5.70%
Rest of World
Schedule Of Geographical Segments [Line Items]
Revenues	3.00%	3.00%	3.00%	2.90%