Condensed Consolidated Financial Statements (Details)	9 Months Ended	12 Months Ended
	Dec. 28, 2019 USD ($) entity segment	Mar. 30, 2019 USD ($)
Financial Statement [Line Items]
Number of operating segments | segment	1
Total assets	$ 1,712,213,000	$ 1,312,288,000
Total liabilities	965,621,000	612,778,000
Operating lease right-of-use assets	211,573,000
Operating lease obligations	207,117,000
Finance lease asset	193,900,000	128,029,000
Finance lease liability	$ 329,972,000
Accounting change - cumulative effect		(582,000)
Revolving Credit Facility [Member]
Financial Statement [Line Items]
Credit facility term	5 years
Revolving credit facility agreement	$ 600,000,000
Number of banks involved in credit facility | entity	8
Credit facility, Potential increased availability	$ 250,000,000
Standby Letters of Credit [Member]
Financial Statement [Line Items]
Revolving credit facility agreement	$ 80,000,000
Accounting Standards Update 2016-02 [Member]
Financial Statement [Line Items]
Total assets		165,300,000
Total liabilities		165,900,000
Operating lease right-of-use assets		186,900,000
Operating lease obligations		174,400,000
Finance lease asset		700,000
Finance lease liability		700,000
Operating lease, asset (liability), difference in assets resulting from favorable leases		19,600,000
Operating lease, asset (liability), difference in assets resulting from unfavorable lease intangibles and deferred rent		7,200,000
Lease financial obligations		18,600,000
Assets related to finance lease construction		11,100,000
Minimum [Member] | Revolving Credit Facility [Member]
Financial Statement [Line Items]
Percentage of face amount of standby letter of credit payable as fees	0.125%
Minimum [Member] | Revolving Credit Facility [Member] | LIBOR [Member]
Financial Statement [Line Items]
Interest rate over LIBOR on the facility	0.75%
Minimum [Member] | Standby Letters of Credit [Member] | LIBOR [Member]
Financial Statement [Line Items]
Interest rate over LIBOR on the facility	0.875%
Maximum [Member] | Revolving Credit Facility [Member]
Financial Statement [Line Items]
Percentage of face amount of standby letter of credit payable as fees	0.35%
Maximum [Member] | Revolving Credit Facility [Member] | LIBOR [Member]
Financial Statement [Line Items]
Interest rate over LIBOR on the facility	2.00%
Maximum [Member] | Standby Letters of Credit [Member] | LIBOR [Member]
Financial Statement [Line Items]
Interest rate over LIBOR on the facility	2.125%
Leased Stores [Member] | Accounting Standards Update 2016-02 [Member]
Financial Statement [Line Items]
Finance lease asset		8,400,000
Finance lease liability		$ 16,600,000