Employee Benefit Plans - Additional Information (Detail)
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12 Months Ended |
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Dec. 27, 2014
USD ($)
Pension_Plan
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Dec. 28, 2013
USD ($)
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Dec. 29, 2012
USD ($)
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| Defined Benefit Plan Disclosure [Line Items] |
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| Expense for defined contribution plans |
$ 3,800,000
|
$ 2,300,000
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$ 2,200,000
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| Number of noncontributory defined benefit pension plans | Pension_Plan |
2
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| Effective date of plan amended to eliminate |
Jan. 01, 2014
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| Level 3 [Member] |
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| Defined Benefit Plan Disclosure [Line Items] |
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| Defined benefit plan fair value of investments |
$ 0
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$ 0
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| Equity Securities [Member] |
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| Defined Benefit Plan Disclosure [Line Items] |
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| Target allocation |
30.00%
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| Fixed Income Securities [Member] |
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| Defined Benefit Plan Disclosure [Line Items] |
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| Target allocation |
63.00%
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| Cash [Member] |
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| Defined Benefit Plan Disclosure [Line Items] |
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| Target allocation |
5.00%
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| Precious Metals [Member] |
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| Defined Benefit Plan Disclosure [Line Items] |
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| Target allocation |
2.00%
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| Minimum [Member] |
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| Defined Benefit Plan Disclosure [Line Items] |
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| Assumed health care cost trend rates |
6.00%
|
7.00%
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| Maximum [Member] |
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| Defined Benefit Plan Disclosure [Line Items] |
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| Assumed health care cost trend rates |
8.00%
|
9.00%
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| Pension Benefits [Member] |
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| Defined Benefit Plan Disclosure [Line Items] |
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| Actuarial loss expected to be amortized from AOCI |
$ 300,000
|
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| Expected contribution to plans |
1,100,000
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| Healthcare & Life Ins [Member] |
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| Defined Benefit Plan Disclosure [Line Items] |
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| Actuarial loss expected to be amortized from AOCI |
100,000
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| Expected contribution to plans |
$ 1,000,000
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