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Summary of Significant Accounting Policies - Additional Information (Details)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 30, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
shares
Dec. 30, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
shares
Mar. 31, 2018
Jul. 25, 2017
GBP (£)
Apr. 01, 2017
USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Restructuring and other charges [1] $ 28.0 $ 0.0 $ 51.3 $ 11.3      
Reclassification of transaction and transition costs out of SG&A into Restructuring $ 485.9 $ 407.6 $ 1,267.4 $ 1,130.0      
Increase in effective tax rate due to change in enacted tax rate 3.70%   1.60%        
Excess tax deficit recognized in provision of income taxes $ 0.1   $ 0.2        
Provisional income tax expense as a result of U.S. Tax reform 12.4            
Estimated provisional expense related to deemed repatriation tax charges 0.3            
Provisional expense due to re-measurement of deferred tax assets 12.1            
Provisional income tax benefit due to corporate tax reduction $ 2.0   $ 2.0        
Anti-dilutive securities excluded from calculation of basic and diluted net income per ordinary share (in shares) | shares 2,243,436 1,906,941 2,503,782 2,002,300      
Maximum              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Forward contracts term, maximum (no more than)     12 months        
Forward foreign currency exchange contracts              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Derivative notional amount $ 189.5   $ 189.5       $ 167.5
Forward foreign currency exchange contracts | Not Designated as Hedging Instrument              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Derivative notional amount 20.6   20.6     £ 1,115,000,000.000 $ 0.0
ASU 2016-09              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Net cash provided by (used in) financing activities       $ (6.4)      
Net cash provided by (used in) operating activities       6.4      
Scenario forecast              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Estimated statutory tax rate for the year         32.00%    
Jimmy Cho PLC | Reclassification adjustment              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Restructuring and other charges [1]     17.4        
Reclassification of transaction and transition costs out of SG&A into Restructuring     (17.4)        
Michael Kors (HK) Limited | Reclassification adjustment              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Restructuring and other charges [1]       11.3      
Reclassification of transaction and transition costs out of SG&A into Restructuring       (11.3)      
Foreign Currency Gain (Loss) | Forward foreign currency exchange contracts | Not Designated as Hedging Instrument              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Net gains (losses) on undesignated derivative contracts (31.8) $ 1.8 3.4 $ 2.1      
Foreign Currency Gain (Loss) | Jimmy Cho PLC | Forward foreign currency exchange contracts | Not Designated as Hedging Instrument              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Net gains (losses) on undesignated derivative contracts $ (32.0)   $ 4.7        
[1] Restructuring and other charges includes store closure costs recorded in connection with the Retail Fleet Optimization Plan, as well as transaction and transition costs recorded in connection with the acquisitions of Jimmy Choo Group Limited (formerly known as Jimmy Choo PLC) and Michael Kors (HK) Limited and Subsidiaries (see Note 3 and Note 8).