Basis of Presentation (Details) - USD ($) $ in Thousands	9 Months Ended
Jul. 04, 2020	Jun. 29, 2019
Goodwill [Line Items]
Impairment of goodwill	$ 327,203	$ 0
Industrial Lasers & Systems
Goodwill [Line Items]
Impairment of goodwill	$ 327,203

Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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