Commitments and Contingencies - Additional Information (Detail) $ in Millions			1 Months Ended	3 Months Ended				12 Months Ended
	Oct. 29, 2013 USD ($)	Oct. 29, 2013 USD ($)	Jun. 30, 2011	Mar. 28, 2015 USD ($)	Dec. 28, 2013 USD ($)	Sep. 28, 2013 USD ($)	Mar. 30, 2013 USD ($)	Sep. 26, 2015 USD ($) Lease term	Sep. 27, 2014 USD ($)	Sep. 28, 2013 USD ($)	Sep. 29, 2012 USD ($)
Contingent Consideration Earn-Out Payments [Line Items]
Payment of contingent consideration								$ 0.0	$ 0.0	$ 43.0
Loss Contingency Damages Sought Related To Additional Contingent Consideration Under Merger And Acquisition Agreement	$ 14.7
Contingent consideration – compensation expense								0.0	0.0	80.0
Property, Plant, and Equipment, Fair Value Disclosure						$ 1.4				1.4
Accrued expenses								272.1	262.1
Accrued lease obligation-long-term								$ 33.8
Operating Lease Expiration Year								2035
Rent Expense Net Of Sublease Income								$ 19.2	21.1	19.9
Operating Leases, Rent Expense, Sublease Rentals								$ 2.0	$ 1.8	1.9
Minimum [Member]
Contingent Consideration Earn-Out Payments [Line Items]
Royalty Based On Revenue Lower Range Percentage								1.00%
Maximum [Member]
Contingent Consideration Earn-Out Payments [Line Items]
Royalty Based On Revenue Upper Range Percentage								35.00%
Interlace [Member]
Contingent Consideration Earn-Out Payments [Line Items]
Payment of contingent consideration							$ 86.9			$ 39.0	$ 47.6
Loss Contingency Damages Sought Related To Additional Contingent Consideration Under Merger And Acquisition Agreement		$ 14.7
Contingent payments period								2 years
Contingent consideration – fair value adjustments							$ 93.8
Interlace [Member] | Minimum [Member]
Contingent Consideration Earn-Out Payments [Line Items]
Business Acquisition Contingent Consideration At Fair Value At Point In Time											51.8
Interlace [Member] | Maximum [Member]
Contingent Consideration Earn-Out Payments [Line Items]
Business Acquisition Contingent Consideration At Fair Value At Point In Time											$ 93.8
TCT International Co., Ltd. [Member]
Contingent Consideration Earn-Out Payments [Line Items]
Payment of contingent consideration					$ 31.1	$ 87.4
Contingent payments period			2 years
Beijing Healthcome Technology [Member]
Contingent Consideration Earn-Out Payments [Line Items]
Payment of contingent consideration				$ 0.7
Finance Leases [Member]
Contingent Consideration Earn-Out Payments [Line Items]
Number Of Finance Leases | Lease								2
Property, Plant, and Equipment, Fair Value Disclosure								$ 28.3
Accrued expenses								$ 3.1
Number Of Optional Lease Extensions | term								2
Lease Extension Period								5 years
Finance Leases [Member] | Minimum [Member]
Contingent Consideration Earn-Out Payments [Line Items]
Optional Lease Extension Period								10 years
Finance Leases [Member] | Maximum [Member]
Contingent Consideration Earn-Out Payments [Line Items]
Optional Lease Extension Period								12 years
Finance Leases [Member] | Leasehold Improvements [Member]
Contingent Consideration Earn-Out Payments [Line Items]
Property, Plant and Equipment, Useful Life								35 years