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Restructuring charges and impairment charges - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jul. 01, 2018 | Jul. 02, 2017 | Jul. 01, 2018 | Jul. 02, 2017 | May 01, 2018
2018 Footprint realignment plan |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring costs expected cash payment | $ 1.0 |  | $ 1.0 |  |
Restructuring reserve | 51.4 |  | 51.4 |  |
2018 Footprint realignment plan | Minimum |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Expected restructuring charges |  |  |  |  | $ 102.0
2018 Footprint realignment plan | Minimum | Accelerated Depreciation And Other Costs |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Expected restructuring charges |  |  |  |  | 40.0
2018 Footprint realignment plan | Maximum |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Expected restructuring charges |  |  |  |  | 133.0
2018 Footprint realignment plan | Maximum | Accelerated Depreciation And Other Costs |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Expected restructuring charges |  |  |  |  | $ 59.0
2016 Footprint realignment plan |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Expected restructuring charges | 43.0 |  | 43.0 |  |
Aggregate restructuring charges incurred | 17.1 |  | 17.1 |  |
Restructuring reserve | 6.3 |  | 6.3 |  |
2016 Footprint realignment plan | Accelerated Depreciation And Other Costs |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring expenses | 2.0 | $ 2.0 | 3.3 | $ 4.1 |
Aggregate restructuring charges incurred | 18.0 |  | 18.0 |  |
2014 Footprint realignment plan |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring expenses | 27.9 |  |  |  |
Aggregate restructuring charges incurred | 12.2 |  | 12.2 |  |
Restructuring reserve | 3.9 |  | 3.9 |  |
2014 Footprint realignment plan | Accelerated Depreciation And Other Costs |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring expenses | 0.6 | $ 0.5 | 1.0 | $ 2.1 |
2014 Footprint realignment plan | Minimum |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Expected restructuring charges | 46.0 |  | 46.0 |  |
2014 Footprint realignment plan | Maximum |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Expected restructuring charges | $ 51.0 |  | $ 51.0 |  |

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