Debt - Narrative (Details) - USD ($)					3 Months Ended	9 Months Ended
	Sep. 05, 2025	Aug. 03, 2025	May 31, 2025	May 31, 2018	Jan. 03, 2026	Sep. 27, 2025	Sep. 28, 2024	Oct. 31, 2025	Dec. 28, 2024
Debt Instrument [Line Items]
Long-term debt obligations						$ 324,200,000			$ 344,600,000
Deferred debt issuance costs, current						400,000
Deferred debt issuance costs						300,000
Proceeds from debt						357,100,000	$ 262,400,000
Repayments of long-term debt						$ 100,000,000
Maximum ratio of interest coverage to earnings for the last four fiscal quarters						4.0
Maximum ratio of leverage to earnings for the last four fiscal quarters						3.5
Unsecured Debt
Debt Instrument [Line Items]
Proceeds from debt						$ 300,000,000
Interest rate						5.70%			5.90%
Bridge Loan
Debt Instrument [Line Items]
Deferred debt issuance costs, current		$ 1,400,000
Borrowings		$ 1,100,000,000
Note term (in years)		364 days
Revolving Credit Facility
Debt Instrument [Line Items]
Long-term line of credit outstanding						$ 75,000,000
Line of credit maximum borrowing capacity						425,000,000
Revolving Credit Facility | Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
Leverage ratio	425.00%
Revolving Credit Facility | Debt Instrument, Redemption, Period Two
Debt Instrument [Line Items]
Leverage ratio	400.00%
Revolving Credit Facility | Debt Instrument, Redemption, Period Three
Debt Instrument [Line Items]
Leverage ratio	350.00%
Revolving Credit Facility | Debt Instrument, Redemption, Period Four
Debt Instrument [Line Items]
Leverage ratio	350.00%
Notes Payable to Banks
Debt Instrument [Line Items]
Long-term debt obligations						275,000,000
Private Placement
Debt Instrument [Line Items]
Fair value of debt obligations						49,000,000
Borrowings						$ 50,000,000
Note term (in years)						10 years
Term Loan Agreement
Debt Instrument [Line Items]
Borrowings						$ 200,000,000
Deferred debt issuance costs						1,000,000.0
Fixed-rate notes due in 2028 with an interest rate of 4.4 %
Debt Instrument [Line Items]
Borrowings				$ 50,000,000
Deferred debt issuance costs						$ 100,000
Note term (in years)				10 years
Interest rate				4.40%
Fixed-rate notes due in 2025 with an interest rate of 4.2 %
Debt Instrument [Line Items]
Note term (in years)			7 years
Interest rate			4.20%
Repaid principal amount			$ 50,000,000
Revolving Facility | Revolving Credit Facility | Steelcase Inc
Debt Instrument [Line Items]
Long-term line of credit outstanding	$ 450,000,000
Revolving Facility | Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Line of credit maximum borrowing capacity	$ 425,000,000
Revolving Facility | Revolving Credit Facility | Line of Credit | Federal Funds Rate
Debt Instrument [Line Items]
Variable rate	0.50%
Revolving Facility | Revolving Credit Facility | Line of Credit | Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Variable rate floor	0.00%
Revolving Facility | Revolving Credit Facility | Line of Credit | Secured Overnight Financing Rate (SOFR) | Variable Rate Component One
Debt Instrument [Line Items]
Variable rate	1.00%
Revolving Facility | Revolving Credit Facility | Line of Credit | Secured Overnight Financing Rate (SOFR) | Minimum | Variable Rate Component One
Debt Instrument [Line Items]
Variable rate	0.25%
Revolving Facility | Revolving Credit Facility | Line of Credit | Secured Overnight Financing Rate (SOFR) | Minimum | Variable Rate Component Two
Debt Instrument [Line Items]
Variable rate	1.25%
Revolving Facility | Revolving Credit Facility | Line of Credit | Secured Overnight Financing Rate (SOFR) | Maximum | Variable Rate Component One
Debt Instrument [Line Items]
Variable rate	0.875%
Revolving Facility | Revolving Credit Facility | Line of Credit | Secured Overnight Financing Rate (SOFR) | Maximum | Variable Rate Component Two
Debt Instrument [Line Items]
Variable rate	1.875%
Revolving Facility | Revolving Credit Facility | Line of Credit | Base Rate
Debt Instrument [Line Items]
Variable rate floor	1.00%
Term Loan A | Bridge Loan
Debt Instrument [Line Items]
Debt instrument, retired	$ 300,000,000
Term Loan A | Senior Unsecured Debt | Line of Credit
Debt Instrument [Line Items]
Borrowings	500,000,000
Decrease in borrowings	$ 150,000,000
Term Loan A | Senior Unsecured Debt | Line of Credit | Forecast
Debt Instrument [Line Items]
Proceeds from debt					$ 350,000,000
Term Loan A | Senior Unsecured Debt | Line of Credit | Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
Periodic repayment percent	2.50%
Term Loan A | Senior Unsecured Debt | Line of Credit | Debt Instrument, Redemption, Period Two
Debt Instrument [Line Items]
Periodic repayment percent	5.00%
Term Loan A | Senior Unsecured Debt | Line of Credit | Debt Instrument, Redemption, Period Three
Debt Instrument [Line Items]
Periodic repayment percent	5.00%
Term Loan A | Senior Unsecured Debt | Line of Credit | Debt Instrument, Redemption, Period Four
Debt Instrument [Line Items]
Periodic repayment percent	7.50%
Term Loan A | Senior Unsecured Debt | Line of Credit | Debt Instrument, Redemption, Period Five
Debt Instrument [Line Items]
Periodic repayment percent	10.00%
Term Loan A | Senior Unsecured Debt | Line of Credit | Federal Funds Rate
Debt Instrument [Line Items]
Variable rate	0.50%
Term Loan A | Senior Unsecured Debt | Line of Credit | Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Variable rate floor	0.00%
Term Loan A | Senior Unsecured Debt | Line of Credit | Secured Overnight Financing Rate (SOFR) | Variable Rate Component One
Debt Instrument [Line Items]
Variable rate	1.00%
Term Loan A | Senior Unsecured Debt | Line of Credit | Secured Overnight Financing Rate (SOFR) | Minimum | Variable Rate Component One
Debt Instrument [Line Items]
Variable rate	0.25%
Term Loan A | Senior Unsecured Debt | Line of Credit | Secured Overnight Financing Rate (SOFR) | Minimum | Variable Rate Component Two
Debt Instrument [Line Items]
Variable rate	1.25%
Term Loan A | Senior Unsecured Debt | Line of Credit | Secured Overnight Financing Rate (SOFR) | Maximum | Variable Rate Component One
Debt Instrument [Line Items]
Variable rate	0.875%
Term Loan A | Senior Unsecured Debt | Line of Credit | Secured Overnight Financing Rate (SOFR) | Maximum | Variable Rate Component Two
Debt Instrument [Line Items]
Variable rate	1.875%
Term Loan A | Senior Unsecured Debt | Line of Credit | Base Rate
Debt Instrument [Line Items]
Variable rate floor	1.00%
Term Loan B | Bridge Loan | Subsequent Event
Debt Instrument [Line Items]
Debt instrument, retired								$ 300,000,000
Term Loan B | Senior Unsecured Debt | Line of Credit
Debt Instrument [Line Items]
Periodic repayment percent	0.25%
Prepayment fee	1.00%
Decrease in borrowings	$ 300,000,000
Term Loan B | Senior Unsecured Debt | Line of Credit | Subsequent Event
Debt Instrument [Line Items]
Borrowings								$ 500,000,000
Term Loan B | Senior Unsecured Debt | Line of Credit | Forecast
Debt Instrument [Line Items]
Proceeds from debt					$ 500,000,000
Term Loan B | Senior Unsecured Debt | Line of Credit | Minimum
Debt Instrument [Line Items]
Borrowings	0
Term Loan B | Senior Unsecured Debt | Line of Credit | Maximum
Debt Instrument [Line Items]
Borrowings	800,000,000
5.125% Notes Due 2029 | Steelcase Inc
Debt Instrument [Line Items]
Borrowings	$ 450,000,000
Interest rate	5.125%