Retirement Plans - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Jun. 27, 2014
Defined Benefit Plans
Retirement Plans [Line Items]
Contributions by employer	$ 5.7
Expected total contribution to the defined benefit plans for the fiscal year 2014	7.3
Post-Retirement Benefit Plans
Retirement Plans [Line Items]
Contributions by employer	0.4
Expected total contribution to the defined benefit plans for the fiscal year 2014	$ 0.5