Commitments and Contingencies - Schedule of Liabilities for Future Environmental Costs (Detail) $ in Millions	Sep. 29, 2017 USD ($)
Loss Contingencies [Line Items]
2018	$ 1.1
2019	0.9
2020	0.8
2021	0.6
2022	0.8
Thereafter	2.6
Total costs	6.8
Less imputed interest	0.8
Reserve amount	6.0
Recurring Costs
Loss Contingencies [Line Items]
2018	0.4
2019	0.4
2020	0.4
2021	0.4
2022	0.4
Thereafter	1.7
Total costs	3.7
Non-Recurring Costs
Loss Contingencies [Line Items]
2018	0.7
2019	0.5
2020	0.4
2021	0.2
2022	0.4
Thereafter	0.9
Total costs	$ 3.1