Derivative Instruments and Hedging Activities (Fair Value of Outstanding Designated and Undesignated Derivative Assets and Liabilities) (Details) - USD ($) $ in Thousands	Mar. 28, 2020	Sep. 28, 2019
Prepaid Expenses and Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative assets	$ 1,813	$ 907
Other Accrued Liabilities
Derivatives, Fair Value [Line Items]
Derivative liabilities	46	251
Cash flow derivatives
Derivatives, Fair Value [Line Items]
Derivative assets	542	907
Designated hedge derivatives | Prepaid Expenses and Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative assets	1,485	907
Designated hedge derivatives | Other Accrued Liabilities
Derivatives, Fair Value [Line Items]
Derivative liabilities	46	133
Designated hedge derivatives | Cash flow derivatives | Prepaid Expenses and Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative assets	542	907
Designated hedge derivatives | Cash flow derivatives | Other Accrued Liabilities
Derivatives, Fair Value [Line Items]
Derivative liabilities	46	133
Designated hedge derivatives | Cross currency swap | Prepaid Expenses and Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative assets	943
Designated hedge derivatives | Cross currency swap | Other Accrued Liabilities
Derivatives, Fair Value [Line Items]
Derivative liabilities	0
Hedge derivatives not designated | Prepaid Expenses and Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative assets	328	0
Hedge derivatives not designated | Other Accrued Liabilities
Derivatives, Fair Value [Line Items]
Derivative liabilities	$ 0	$ 118