Income Taxes-Effective Income Tax Rate Reconciliation (Details)	9 Months Ended	12 Months Ended
	Dec. 31, 2017	Mar. 29, 2020	Mar. 31, 2019	Apr. 01, 2018
Income Tax Disclosure [Abstract]
Statutory federal income tax (percent)	35.00%	21.00%	21.00%	31.50%
State income taxes, net of federal deduction (percent)		5.70%	5.80%	(8.30%)
ESOP dividend deduction on allocated shares (percent)		(0.30%)	(0.30%)	1.40%
Domestic production deduction (percent)		0.00%	0.00%	2.70%
Goodwill impairment (percent)		0.00%	0.00%	(81.70%)
Revaluation of net deferred tax liabilities (percent)		0.00%	0.00%	92.50%
Other — net (percent)		0.80%	0.60%	1.00%
Total (percent)		27.20%	27.10%	39.10%