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EMPLOYEE STOCK PLANS - Share-based Compensation Expense (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 29, 2023	Dec. 30, 2022
Share-based Payment Arrangement, Expensed and Capitalized, Amount
Total share-based compensation expense	$ 3.7	$ 3.3
Cost of revenues
Share-based Payment Arrangement, Expensed and Capitalized, Amount
Total share-based compensation expense	0.5	0.4
Research and development
Share-based Payment Arrangement, Expensed and Capitalized, Amount
Total share-based compensation expense	0.9	0.8
Selling, general, and administrative
Share-based Payment Arrangement, Expensed and Capitalized, Amount
Total share-based compensation expense	$ 2.3	$ 2.1

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479830/718-10-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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- Definition

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+ References

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