Consolidated Statements of Shareholders' Equity - USD ($) shares in Millions, $ in Millions		Total	Interest Rate Swaps [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Accumulated Other Comprehensive Income (Loss) [Member] Interest Rate Swaps [Member]	Retained Earnings [Member]
Balance Beginning at Jun. 27, 2020		$ 2,010.6		$ 1.3	$ 1,703.0	$ (10.3)		$ 316.6
Balance Beginning, shares at Jun. 27, 2020				131.3
Net income		16.9						16.9
Interest rate swaps		1.3	$ 1.3				$ 1.3
Issuance of common stock under stock-based compensation plans		(1.0)			(1.0)
Issuance of common stock under stock-based compensation plans, shares				0.4
Issuance of common stock under employee stock purchase plan		7.8			7.8
Issuance of common stock under employee stock purchase plan, shares				0.3
Stock-based compensation expense		11.3			11.3
Balance Ending at Dec. 26, 2020		2,046.9		$ 1.3	1,721.1	(9.0)		333.5
Balance Ending, shares at Dec. 26, 2020				132.0
Balance Beginning at Sep. 26, 2020		2,020.7		$ 1.3	1,713.4	(9.9)		315.9
Balance Beginning, shares at Sep. 26, 2020				132.0
Net income		17.6						17.6
Interest rate swaps		0.9	0.9				0.9
Issuance of common stock under stock-based compensation plans		0.7			0.7
Stock-based compensation expense		7.0			7.0
Balance Ending at Dec. 26, 2020		2,046.9		$ 1.3	1,721.1	(9.0)		333.5
Balance Ending, shares at Dec. 26, 2020				132.0
Balance Beginning at Jul. 03, 2021		$ 2,106.1		$ 1.3	1,752.8	(5.3)		357.3
Balance Beginning, shares at Jul. 03, 2021		132.5		132.5
Net income		$ 13.1						13.1
Interest rate swaps		5.8	5.8				5.8
Issuance of common stock under stock-based compensation plans		(6.8)			(6.8)
Issuance of common stock under stock-based compensation plans, shares				0.6
Issuance of common stock under employee stock purchase plan		12.3			12.3
Issuance of common stock under employee stock purchase plan, shares				0.3
Conversion of Core-Mark shares of common stock		998.8		$ 0.2	998.6
Conversion of Core-Mark shares of common stock, shares				19.9
Conversion of Core-Mark stock-based compensation	[1]	9.2			9.2
Stock-based compensation expense		22.4			22.4
Balance Ending at Jan. 01, 2022		$ 3,160.9		$ 1.5	2,788.5	0.5		370.4
Balance Ending, shares at Jan. 01, 2022		153.3		153.3
Balance Beginning at Oct. 02, 2021		$ 3,123.5		$ 1.5	2,764.6	(4.6)		362.0
Balance Beginning, shares at Oct. 02, 2021				152.8
Net income		8.4						8.4
Interest rate swaps		5.1	$ 4.7				$ 4.7
Foreign currency translation adjustment		0.4				0.4
Issuance of common stock under stock-based compensation plans		(1.9)			(1.9)
Issuance of common stock under stock-based compensation plans, shares				0.2
Issuance of common stock under employee stock purchase plan		12.3			12.3
Issuance of common stock under employee stock purchase plan, shares				0.3
Stock-based compensation expense		13.5			13.5
Balance Ending at Jan. 01, 2022		$ 3,160.9		$ 1.5	$ 2,788.5	$ 0.5		$ 370.4
Balance Ending, shares at Jan. 01, 2022		153.3		153.3

[1] Represents the portion of replacement stock-based compensation awards that relates to pre-combination vesting.