Income Taxes - Net Operating Loss Carryforwards Expire (Detail) $ in Millions	Dec. 30, 2017 USD ($)
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforward State	$ 86
2018-2022 [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforward State	25
2023-2027 [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforward State	42
2028-2032 [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforward State	14
2033-2037 [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforward State	$ 5