Condensed Consolidated Balance Sheets (Parenthetical) In Millions, except Share data, unless otherwise specified	Dec. 26, 2014 USD ($)	Dec. 26, 2014 EUR (€)	Sep. 26, 2014 USD ($)	Sep. 26, 2014 EUR (€)
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 9.1		$ 6.6
Preferred shares, par value (in usd per share)	$ 0.20		$ 0.20
Preferred shares, shares authorized (in shares)	500,000,000	500,000,000	500,000,000	500,000,000
Preferred shares, shares issued (in shares)	0	0	0	0
Preferred shares, shares outstanding (in shares)	0	0	0	0
Ordinary A shares, par value (in eur per share)		€ 1		€ 1
Ordinary A shares, shares authorized (in shares)	40,000	40,000	40,000	40,000
Ordinary A shares, shares issued (in shares)	0	0	0	0
Ordinary A shares, shares outstanding (in shares)	0	0	0	0
Ordinary shares, par value (in usd per share)	$ 0.20		$ 0.20
Ordinary shares, shares authorized (in shares)	500,000,000	500,000,000	500,000,000	500,000,000
Ordinary shares, shares issued (in shares)	116,574,458	116,574,458	116,160,353	116,160,353
Ordinary shares, shares outstanding (in shares)	116,223,321	116,223,321	115,929,588	115,929,588
Ordinary shares held in treasury at cost (in shares)	351,137	351,137	230,765	230,765