Condensed Consolidated Balance Sheets (Parenthetical) $ in Millions	Mar. 25, 2016 USD ($) $ / shares shares	Mar. 25, 2016 € / shares	Sep. 25, 2015 USD ($) $ / shares shares	Sep. 25, 2015 € / shares
Allowance for doubtful accounts | $	$ 6.5		$ 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 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)	117,875,515		117,513,370
Ordinary shares, shares outstanding (in shares)	109,297,161		116,283,149
Ordinary shares held in treasury at cost (in shares)	8,578,354		1,230,221
Ordinary A
Ordinary shares | $	$ 0.0		$ 0.0
Ordinary shares, par value (in usd per share) | € / shares		€ 1.00		€ 1.00
Ordinary shares, shares authorized (in shares)	40,000		40,000
Ordinary shares, shares issued (in shares)	0		0
Ordinary A shares, shares outstanding (in shares)	0		0