Accrued Expenses and Other Long-Term Liabilities - Schedule of Other Long-Term Liabilities (Detail) - USD ($) $ in Millions	Sep. 24, 2016	Sep. 26, 2015
Other Long-Term Liabilities
Reserve for income tax uncertainties	$ 167.6	$ 145.1
Accrued lease obligation-long-term	34.8	34.0
Pension liabilities	11.2	10.1
Other	10.9	11.7
Total	$ 224.5	$ 200.9