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. 31, 2016	Dec. 26, 2015	Dec. 31, 2016	Dec. 26, 2015
Numerator:
Net income attributable to MKHL	$ 271.3	$ 294.6	$ 579.3	$ 662.1
Denominator:
Basic weighted average shares (in shares)	163,148,597	182,176,452	168,000,933	189,336,957
Weighted average dilutive share equivalents:
Share options, restricted shares/units, and performance restricted share units (in shares)	2,065,448	2,675,164	2,221,655	2,806,465
Diluted weighted average shares (in shares)	165,214,045	184,851,616	170,222,588	192,143,422
Basic net income per share (in dollars per share)	$ 1.66	$ 1.62	$ 3.45	$ 3.50
Diluted net income per share (in dollars per share)	$ 1.64	$ 1.59	$ 3.40	$ 3.45