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Revenue Recognition - Revenue by Product (Details) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2023 USD ($) productLine	Dec. 25, 2022 USD ($)	Dec. 31, 2023 USD ($) productLine	Dec. 25, 2022 USD ($)
Revenue from Contract with Customer [Abstract]
Number of product lines | productLine	2		2
Revenue from External Customer [Line Items]
Revenue	$ 208.4	$ 173.8	$ 405.8	$ 363.2
Power Products
Revenue from External Customer [Line Items]
Revenue	107.7	96.0	208.9	200.5
Materials Products
Revenue from External Customer [Line Items]
Revenue	$ 100.7	$ 77.8	$ 196.9	$ 162.7

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 11: http://www.xbrl.org/2003/role/disclosureRef
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Revenue From Contract With Customer, Number Of Product Lines

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