Intangible Assets and Goodwill - Changes in Goodwill for Reportable Segments (Details) $ in Millions	12 Months Ended
	Mar. 31, 2018 USD ($)
Goodwill [Roll Forward]
Beginning balance	$ 119.7
Acquisition of Jimmy Choo	684.9
Foreign currency translation	43.1
Ending balance	847.7
MK Retail assets
Goodwill [Roll Forward]
Beginning balance	91.9
Acquisition of Jimmy Choo	0.0
Foreign currency translation	0.0
Ending balance	91.9
MK Wholesale
Goodwill [Roll Forward]
Beginning balance	25.9
Acquisition of Jimmy Choo	0.0
Foreign currency translation	0.0
Ending balance	25.9
MK Licensing
Goodwill [Roll Forward]
Beginning balance	1.9
Acquisition of Jimmy Choo	0.0
Foreign currency translation	0.0
Ending balance	1.9
Jimmy Choo
Goodwill [Roll Forward]
Beginning balance	0.0
Acquisition of Jimmy Choo	684.9
Foreign currency translation	43.1
Ending balance	$ 728.0