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Commitments and contingent liabilities (Detail) $ in Millions	9 Months Ended
	Sep. 29, 2019 USD ($)
Loss Contingencies [Line Items]
Estimated litigation liability	$ 0.2
Minimum
Loss Contingencies [Line Items]
Estimated time fram over which accrued amounts may be paid out	10 years
Maximum
Loss Contingencies [Line Items]
Estimated time fram over which accrued amounts may be paid out	15 years
Accrued Liabilities
Loss Contingencies [Line Items]
Accrual for environmental loss contingencies	$ 0.9
Other Liability
Loss Contingencies [Line Items]
Accrual for environmental loss contingencies	$ 6.3

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Total costs accrued as of the balance sheet date for environmental loss contingencies.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=118942415&loc=d3e14326-108349

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 25
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6395460&loc=d3e13647-108346

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 30
-Section 50
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Aggregate carrying amount of the estimated litigation liability for known or estimated probable loss from litigation, which may include attorneys' fees and other litigation costs.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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