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Commitments and contingent liabilities (Detail) - USD ($) |  | 9 Months Ended
--- | --- | ---
Dec. 05, 2014 | Sep. 25, 2016
Loss Contingencies [Line Items] |  |
Estimated litigation liability |  | $ 2,500,000
Parish of Calcasieu | Judicial Ruling | Compensatory Damages |  |
Loss Contingencies [Line Items] |  |
Damages awarded | $ 100,000 |
Parish of Calcasieu | Judicial Ruling | Punitive Damages |  |
Loss Contingencies [Line Items] |  |
Damages awarded | $ 23,000,000 |
Parish of Calcasieu | Judicial Ruling | Unfavorable Regulatory Action |  |
Loss Contingencies [Line Items] |  |
Possible loss |  | 10,000,000.0
Discontinued Operations |  |
Loss Contingencies [Line Items] |  |
Estimated litigation liability |  | $ 1,500,000
Minimum |  |
Loss Contingencies [Line Items] |  |
Time-frame over which the accrued amounts may be paid out, in years |  | 15 years
Maximum |  |
Loss Contingencies [Line Items] |  |
Time-frame over which the accrued amounts may be paid out, in years |  | 20 years
Accrued Liabilities |  |
Loss Contingencies [Line Items] |  |
Waste disposed accrued liability |  | $ 1,000,000
Other Liability |  |
Loss Contingencies [Line Items] |  |
Waste disposed accrued liability |  | 5,300,000
Construction In Progress | European Headquarters |  |
Loss Contingencies [Line Items] |  |
Property, plant and equipment |  | $ 14,600,000

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