Condensed Consolidated Balance Sheets (Parenthetical) $ in Millions	Dec. 25, 2015 USD ($) $ / shares shares	Dec. 25, 2015 € / shares	Sep. 25, 2015 USD ($) $ / shares shares	Sep. 25, 2015 € / shares
Statement of Financial Position [Abstract]
Allowance for doubtful accounts | $	$ 6.0		$ 4.7
Preferred shares, par value (in usd per share) | $ / shares	$ 0.20		$ 0.20
Preferred shares, shares authorized (in shares)	500,000,000		500,000,000
Preferred shares, shares issued (in shares)	0		0
Preferred shares, shares outstanding (in shares)	0		0
Ordinary A shares, par value (in eur per share) | € / shares		€ 1.00		€ 1.00
Ordinary A shares, shares authorized (in shares)	40,000		40,000
Ordinary A shares, shares issued (in shares)	0		0
Ordinary A shares, shares outstanding (in shares)	0		0
Ordinary shares, par value (in usd per share) | $ / shares	$ 0.20		$ 0.20
Ordinary shares, shares authorized (in shares)	500,000,000		500,000,000
Ordinary shares, shares issued (in shares)	117,696,232		117,513,370
Ordinary shares, shares outstanding (in shares)	112,555,311		116,283,439
Ordinary shares held in treasury at cost (in shares)	5,140,921		1,230,221