Acquisition	12 Months Ended
Sep. 29, 2018
Acquisition [Abstract]
Acquisition	Acquisition On July 27, 2018, the Company purchased the assets of one of the business lines of Cascade Controls, Inc. ("Cascade"), a new product introduction company in Portland, Oregon, for $12.4 million in cash, subject to certain customary post-closing adjustments. Plexus acquired substantially all of the inventory, equipment and other assets of the business line, hired a majority of its employees and sub-leased one of Cascade's facilities. This transaction has been accounted for as a business combination. The acquisition resulted in a $12.4 million cash outflow included in "Business acquisition" in the accompanying Consolidated Statement of Cash Flows and $8.2 million of intangible assets related to customer relationships, which is included in "Intangible assets" in the accompanying Consolidated Balance Sheet. The intangible assets will be amortized on a straight-line basis and result in amortization expense for fiscal 2019, 2020, 2021, 2022 and 2023 of approximately $1.2 million per year. There were no other material impacts to the Company's Consolidated Financial Statements as a result of the acquisition.

Acquisition

On July 27, 2018, the Company purchased the assets of one of the business lines of Cascade Controls, Inc. ("Cascade"), a new product introduction company in Portland, Oregon, for $12.4 million in cash, subject to certain customary post-closing adjustments. Plexus acquired substantially all of the inventory, equipment and other assets of the business line, hired a majority of its employees and sub-leased one of Cascade's facilities. This transaction has been accounted for as a business combination.

The acquisition resulted in a $12.4 million cash outflow included in "Business acquisition" in the accompanying Consolidated Statement of Cash Flows and $8.2 million of intangible assets related to customer relationships, which is included in "Intangible assets" in the accompanying Consolidated Balance Sheet. The intangible assets will be amortized on a straight-line basis and result in amortization expense for fiscal 2019, 2020, 2021, 2022 and 2023 of approximately $1.2 million per year. There were no other material impacts to the Company's Consolidated Financial Statements as a result of the acquisition.