Employee Benefit Plans (Tables)

6 Months Ended

Sep. 08, 2018

Retirement Benefits [Abstract]

Schedule of Components of Net Pension and Post-retirement Expense

The following tables provide the components of net pension and post-retirement expense (in millions):

	12 weeks ended
	Pension						Other post-retirement benefits
	September 8, 2018			September 9, 2017			September 8, 2018		September 9, 2017
Estimated return on plan assets	$	(26.0	)	$	(27.6	)	$	—	$	—
Service cost	12.1			11.5			0.2		0.2
Interest cost	19.8			20.4			0.1		0.2
Amortization of prior service cost	—			—			0.9		0.9
Amortization of net actuarial (gain) loss	(1.5		)	0.1			—		—
Net expense	$	4.4		$	4.4		$	1.2	$	1.3

	28 weeks ended
	Pension						Other post-retirement benefits
	September 8, 2018			September 9, 2017			September 8, 2018			September 9, 2017
Estimated return on plan assets	$	(60.6	)	$	(64.4	)	$	—		$	—
Service cost	28.2			26.8			0.5			0.5
Interest cost	46.2			47.5			0.3			0.5
Amortization of prior service cost	—			0.1			2.0			2.0
Amortization of net actuarial (gain) loss	(3.4		)	0.2			(0.1		)	—
Net expense	$	10.4		$	10.2		$	2.7		$	3.0