Commitments and Contingencies - Summary of Contingent Consideration Charges Recorded to the Consolidated Statement of Operations (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 26, 2015	Sep. 27, 2014	Sep. 28, 2013
Other Contingencies And Commitments [Line Items]
Contingent consideration – compensation expense	$ 0.0	$ 0.0	$ 80.0
Contingent consideration – fair value adjustments	$ 0.0	$ 0.0	11.3
Contingent consideration expense			91.3
Interlace Medical, Inc [Member]
Other Contingencies And Commitments [Line Items]
Contingent consideration – compensation expense			0.0
Contingent consideration – fair value adjustments			11.3
Contingent consideration expense			11.3
TCT International Co., Ltd. [Member]
Other Contingencies And Commitments [Line Items]
Contingent consideration – compensation expense			80.0
Contingent consideration – fair value adjustments			0.0
Contingent consideration expense			$ 80.0