Retirement Plans - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 27, 2013
Defined Benefit Plans
Retirement Plans [Line Items]
Contributions by employer	$ 1.5
Expected total contribution to the defined benefit plans for the fiscal year 2014	6.4
Post-Retirement Benefit Plans
Retirement Plans [Line Items]
Contributions by employer	0.1
Expected total contribution to the defined benefit plans for the fiscal year 2014	$ 0.5