Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2420-110228

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

Significant Accounting Policies - Long-lived assets (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended	12 Months Ended
	Apr. 04, 2020	Apr. 04, 2020	Oct. 03, 2020
Long-lived assets [Abstract]
Asset impairment charges	$ 2.5
Finite-Lived Intangible Assets \| Industrial Lasers & Systems
Long-lived assets [Abstract]
Asset impairment charges			$ 33.9
Property and equipment \| Industrial Lasers & Systems
Long-lived assets [Abstract]
Asset impairment charges			85.6
Right-Of-Use Assets \| Industrial Lasers & Systems
Long-lived assets [Abstract]
Asset impairment charges		$ 1.8	$ 1.8