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Summary of Significant Accounting Policies - Components of Calculation of Basic Net Income Per Ordinary Share and Diluted Net Income Per Ordinary Share (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Dec. 30, 2017
Dec. 31, 2016
Dec. 30, 2017
Dec. 31, 2016
Numerator:        
Net income attributable to MKHL $ 219.4 $ 271.3 $ 547.8 $ 579.3
Denominator:        
Basic weighted average shares (in shares) 152,047,963 163,148,597 152,772,067 168,000,933
Weighted average dilutive share equivalents:        
Share options, restricted shares/units, and performance restricted share units (in shares) 2,575,376 2,065,448 2,448,917 2,221,655
Diluted weighted average shares (in shares) 154,623,339 165,214,045 155,220,984 170,222,588
Basic net income per share (in dollars per share) $ 1.44 $ 1.66 $ 3.59 $ 3.45
Diluted net income per share (in dollars per share) $ 1.42 $ 1.64 $ 3.53 $ 3.40