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.

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Name:	us-gaap_GoodwillImpairmentLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Goodwill and Intangible Assets - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Apr. 04, 2020	Jul. 04, 2020	Jun. 29, 2019
Goodwill [Line Items]
Impairment charges		$ (327,203)	$ 0
Industrial Lasers & Systems
Goodwill [Line Items]
Impairment charges		$ (327,203)
Intangible Assets \| Industrial Lasers & Systems
Goodwill [Line Items]
Non-cash pre-tax charges	$ 33,900
Property, Plant and Equipment \| Industrial Lasers & Systems
Goodwill [Line Items]
Non-cash pre-tax charges	85,600
Right-Of-Use Assets \| Industrial Lasers & Systems
Goodwill [Line Items]
Non-cash pre-tax charges	$ 1,800