Summary of Significant Accounting Policies - Activity and Balances of Sales Reserves (Details) - Allowance for sales returns - USD ($) $ in Millions	12 Months Ended
Mar. 31, 2018	Apr. 01, 2017	Apr. 02, 2016
MK Retail assets
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance Beginning of Year	$ 7.3	$ 4.7	$ 2.5
Amounts Charged to Revenue	160.7	102.4	71.7
Write-offs Against Reserves	(155.9)	(99.8)	(69.5)
Balance at Year End	12.1	7.3	4.7
MK Wholesale
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance Beginning of Year	96.7	110.9	87.5
Amounts Charged to Revenue	257.7	271.1	348.4
Write-offs Against Reserves	(245.8)	(285.3)	(325.0)
Balance at Year End	$ 108.6	$ 96.7	$ 110.9

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

No definition available.

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- Definition

Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SX 210.12-09)
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690

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- Definition

Amount of increase in the allowances and reserves, which consist of the valuation and qualifying accounts that are either netted against the cost of an asset or that reflect a liability established to represent expected future costs, from charges to accounts other than costs and expenses.

+ References

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- Definition

Total of the deductions in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, representing receivables written off as uncollectible and portions of the reserves utilized, respectively.

+ References

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