Employee Benefit Plans - Narrative (Details) - USD ($) $ in Millions	4 Months Ended
	Jun. 16, 2018	Jun. 17, 2017
Defined Benefit Plan Disclosure [Line Items]
Expected future employer contributions for remainder of the fiscal year	$ 49.8
Defined contribution plan costs	14.0	$ 13.6
Pension
Defined Benefit Plan Disclosure [Line Items]
Contribution made to defined benefit plan	5.5
Other post-retirement benefits
Defined Benefit Plan Disclosure [Line Items]
Contribution made to defined benefit plan	$ 2.1