Derivative Instruments and Hedging Activities (Fair Value of Outstanding Designated and Undesignated Derivative Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 28, 2019	Sep. 28, 2019
Prepaid Expenses and Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative assets	$ 665	$ 907
Other Accrued Liabilities
Derivatives, Fair Value [Line Items]
Derivative liabilities	194	251
Cash flow derivatives
Derivatives, Fair Value [Line Items]
Derivative assets	665	907
Designated hedge derivatives | Prepaid Expenses and Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative assets	665	907
Designated hedge derivatives | Other Accrued Liabilities
Derivatives, Fair Value [Line Items]
Derivative liabilities	126	133
Designated hedge derivatives | Cash flow derivatives | Prepaid Expenses and Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative assets	665	907
Designated hedge derivatives | Cash flow derivatives | Other Accrued Liabilities
Derivatives, Fair Value [Line Items]
Derivative liabilities	126	133
Hedge derivatives not designated | Prepaid Expenses and Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative assets	0	0
Hedge derivatives not designated | Other Accrued Liabilities
Derivatives, Fair Value [Line Items]
Derivative liabilities	$ 68	$ 118