Equity Stock Repurchase Program (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended	12 Months Ended
	Dec. 30, 2016	Dec. 29, 2017	Sep. 30, 2016	Sep. 25, 2015	Mar. 01, 2017	Mar. 16, 2016	Nov. 19, 2015	Jan. 23, 2015
Class of Stock [Line Items]
Employee Service Share-based Compensation, Cash Flow Effect, Cash Used to Settle Awards	$ 0.4	$ 5.1	$ 2.3	$ 17.2
March 2016 Repurchase Program [Member]
Class of Stock [Line Items]
Stock Repurchase Program, Authorized Amount						$ 350.0
Repurchase of ordinary shares, shares	1,501,676	5,366,741	0	0
Repurchase of ordinary shares, value	$ 84.0	$ 266.0	$ 0.0	$ 0.0
Stock Repurchase Program, Remaining Authorized Repurchase Amount			$ 0.0
November 2015 Share Repurchase Program [Member]
Class of Stock [Line Items]
Stock Repurchase Program, Authorized Amount							$ 500.0
Repurchase of ordinary shares, shares	1,063,337	0	6,510,824	0
Repurchase of ordinary shares, value	$ 74.4	$ 0.0	$ 425.6	$ 0.0
Stock Repurchase Program, Remaining Authorized Repurchase Amount			$ 0.0
January 2015 Repurchase Program [Member]
Class of Stock [Line Items]
Stock Repurchase Program, Authorized Amount								$ 300.0
Repurchase of ordinary shares, shares	0	0	3,199,279	823,592
Repurchase of ordinary shares, value	$ 0.0	$ 0.0	$ 225.0	$ 75.0
Stock Repurchase Program, Remaining Authorized Repurchase Amount			$ 0.0
March 2017 Repurchase Program [Member]
Class of Stock [Line Items]
Stock Repurchase Program, Authorized Amount					$ 1,000.0
Repurchase of ordinary shares, shares	0	13,490,448	0	0
Repurchase of ordinary shares, value	$ 0.0	$ 380.6	$ 0.0	$ 0.0
Stock Repurchase Program, Remaining Authorized Repurchase Amount		$ 619.4