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Derivatives (Narrative) (Details) € in Millions	3 Months Ended		9 Months Ended
Derivatives (Narrative) (Details) € in Millions	Jun. 28, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 28, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 28, 2020 EUR (€)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)
Derivative [Line Items]
Gain on derivative	$ (2,100,000)	$ (400,000)	$ (500,000)	$ 5,400,000
4.00% Notes, due October 1, 2026
Derivative [Line Items]
Aggregate principal amount	$ 476,800,000		$ 476,800,000			$ 465,000,000.0
Stated interest rate	4.00%		4.00%		4.00%	4.00%
Interest Rate Swaps \| Interest expense
Derivative [Line Items]
Gain on derivative				(600,000)
Interest Rate Swaps \| Discontinued Operations \| Interest expense
Derivative [Line Items]
Gain on derivative				$ 3,600,000
Cash Flow Hedge \| Commodity Swaps
Derivative [Line Items]
Derivative net gain estimated to be reclassified from AOCI into earnings over the next 12 months	$ 100,000		$ 100,000
Cash Flow Hedge \| Foreign Exchange Contracts
Derivative [Line Items]
Derivative net gain estimated to be reclassified from AOCI into earnings over the next 12 months	1,100,000		1,100,000
Notional value	196,500,000		196,500,000			$ 235,600,000
Cash Flow Hedge \| Interest Rate Swaps
Derivative [Line Items]
Notional value							$ 300,000,000.0
Derivative, fixed interest rate							1.76%
Interest rate swaps outstanding	0		0
Fair Value Hedge
Derivative [Line Items]
Posted cash collateral	0		0			0
Posted standby letters of credit	0		0			0
Net Investment Hedge
Derivative [Line Items]
Pre-tax gain (loss) related to translation of undesignated debt obligation recognized in earnings			(1,200,000)
Not Designated as Hedging \| Foreign Exchange Contracts
Derivative [Line Items]
Notional value	$ 585,000,000.0		$ 585,000,000.0			$ 977,500,000
SBI \| Net Investment Hedge \| 4.00% Notes, due October 1, 2026
Derivative [Line Items]
Aggregate principal amount \| €					€ 425.0
Stated interest rate	4.00%		4.00%		4.00%