Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended			6 Months Ended		12 Months Ended
	Jun. 30, 2023	Sep. 30, 2022	Jul. 01, 2022	Jun. 30, 2023	Jul. 01, 2022	Dec. 30, 2022
Cash flows from operating activities:
Net income (loss)	$ (8.2)		$ (21.7)	$ (7.8)	$ 9.1
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization				18.2	20.0
Amortization of intangible assets				11.4	15.7
Stock-based compensation	1.0		4.5	4.7	10.1
Amortization of debt issuance costs				1.9	1.9
Gain on the disposal of assets				(0.4)	(0.1)
Deferred income taxes				(0.6)	1.1
Change in the fair value of financial instruments				(0.2)	(1.1)
Net losss on divestitures	0.0	$ 20.8	56.6	0.0	56.6	$ 77.4
Changes in assets and liabilities:
Accounts receivable				75.1	2.8
Inventories				45.1	(43.2)
Prepaid expenses and other current assets				5.2	(2.9)
Other non-current assets				(0.3)	(1.0)
Accounts payable				(62.6)	(55.8)
Accrued compensation and related benefits				(12.5)	4.6
Income taxes payable				(4.3)	(2.5)
Operating lease assets and liabilities				(2.9)	(2.3)
Other liabilities				(5.6)	1.3
Net cash provided by operating activities				64.4	14.3
Cash flows from investing activities:
Purchases of property, plant and equipment				(47.0)	(46.5)
Proceeds from sale of equipment, including insurance proceeds				0.5	0.4
Divestiture of subsidiaries				0.0	(0.3)
Net cash used in investing activities				(46.5)	(46.4)
Cash flows from financing activities:
Principal payments on bank borrowings				(30.9)	(10.5)
Repurchase of shares				(23.7)	0.0
Employees' taxes paid upon vesting of restricted stock units				(2.2)	(3.8)
Payments of dividends to a joint venture shareholder				(0.1)	(0.3)
Proceeds from bank borrowings				0.0	4.7
Proceeds from issuance of common stock				0.0	0.7
Net cash used in financing activities				(56.9)	(9.2)
Effect of exchange rate changes on cash and cash equivalents				1.0	(3.8)
Net decrease in cash and cash equivalents				(38.0)	(45.1)
Cash and cash equivalents at beginning of period		$ 421.4		358.8	466.5	466.5
Cash and cash equivalents at end of period	$ 320.8		$ 421.4	320.8	421.4	$ 358.8
Supplemental cash flow information:
Income taxes paid, net of income tax refunds				17.4	16.5
Interest paid				21.7	13.8
Non-cash investing and financing activities:
Property, plant and equipment purchased included in accounts payable and other liabilities				$ 9.2	$ 4.4