Summary of Significant Accounting policies - Schedule of Estimated Useful Life (Detail)	12 Months Ended
	Sep. 29, 2017
Minimum | Buildings and improvements
Property Plant And Equipment Estimated Useful Lives [Line Items]
Estimated Useful Life In Years	20 years
Minimum | Machinery and equipment
Property Plant And Equipment Estimated Useful Lives [Line Items]
Estimated Useful Life In Years	2 years
Minimum | Computer equipment and software
Property Plant And Equipment Estimated Useful Lives [Line Items]
Estimated Useful Life In Years	2 years
Minimum | Furniture and fixtures
Property Plant And Equipment Estimated Useful Lives [Line Items]
Estimated Useful Life In Years	7 years
Maximum | Buildings and improvements
Property Plant And Equipment Estimated Useful Lives [Line Items]
Estimated Useful Life In Years	40 years
Maximum | Machinery and equipment
Property Plant And Equipment Estimated Useful Lives [Line Items]
Estimated Useful Life In Years	7 years
Maximum | Computer equipment and software
Property Plant And Equipment Estimated Useful Lives [Line Items]
Estimated Useful Life In Years	5 years
Maximum | Furniture and fixtures
Property Plant And Equipment Estimated Useful Lives [Line Items]
Estimated Useful Life In Years	10 years