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Retirement Plans
 3 Months Ended
Dec. 26, 2014
Compensation and Retirement Disclosure [Abstract]  
Retirement Plans
12.
Retirement Plans
The net periodic benefit cost for the Company's defined benefit pension plans was as follows:
 
Three Months Ended
 
December 26,
2014
 
December 27,
2013
Service cost
$
1.2


$
1.3

Interest cost
4.5


4.9

Expected return on plan assets
(5.8
)

(6.1
)
Amortization of net actuarial loss
2.3


2.1

Amortization of prior service (credit) cost
(0.2
)

(0.1
)
Net periodic benefit cost
$
2.0


$
2.1



The net periodic benefit credit for the Company's postretirement benefit plans for the three months ended December 26, 2014 and December 27, 2013 was $0.5 million and $1.8 million, respectively. The components of the credit were not material.
Net periodic benefit cost (credit) for the Company's defined benefit pension plans and postretirement benefit plans is included within cost of sales and selling, general and administrative expenses on the unaudited condensed consolidated statements of income.
The Company does not anticipate making material involuntary contributions in fiscal 2015, but may elect to make voluntary contributions to its defined benefit pension plans or its postretirement benefit plans during fiscal 2015.