Fair Value - Additional Information (Detail) - USD ($)	12 Months Ended
	Sep. 29, 2017	Sep. 30, 2016	Oct. 02, 2015
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Impairment charges	$ 51,400,000	$ 0	$ 0
Fair value of current maturities of long-term debt	0	49,400,000
Long-term debt	0	286,900,000
Notes Receivable
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Long-term (1)	$ 86,700,000	59,200,000
Minimum
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Minimum remaining maturity of foreign currency derivatives (in months)	1 month
Maximum
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Minimum remaining maturity of foreign currency derivatives (in months)	13 months
Original CPTC Loans
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Impairment charges	$ 51,400,000
Other loan related impairment charges	$ 200,000
Approximate Carrying Value
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of current maturities of long-term debt		50,000,000
Long-term debt		$ 287,500,000