Segment Information - Impairment Charges by Asset Type (Details) - USD ($) $ in Millions	3 Months Ended						12 Months Ended
	Mar. 31, 2018	Dec. 30, 2017	Sep. 30, 2017	Apr. 01, 2017	Dec. 31, 2016	Oct. 01, 2016	Mar. 31, 2018	Apr. 01, 2017	Apr. 02, 2016
Segment Reporting Information [Line Items]
Impairment of long-lived assets	$ 13.8	$ 2.6	$ 16.3	$ 193.8	$ 0.5	$ 4.9	$ 32.7	$ 199.2	$ 10.9
Operating segments | MK Retail assets
Segment Reporting Information [Line Items]
Impairment of long-lived assets							31.3	198.7	8.6
Operating segments | MK Wholesale assets
Segment Reporting Information [Line Items]
Impairment of long-lived assets							1.4	0.5	0.4
Corporate
Segment Reporting Information [Line Items]
Impairment of long-lived assets							$ 0.0	$ 0.0	$ 1.9