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Description Of Business, Basis Of Presentation And Summary Of Significant Accounting Policies (Narrative) (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 28, 2020 USD ($) property store state | Mar. 28, 2020 USD ($) property store state segment item | Mar. 30, 2019 USD ($) | Mar. 31, 2018 USD ($)
Significant Accounting Policies [Line Items] |  |  |  |
Company operated stores | store | 1,283 | 1,283 |  |
Franchised locations | property | 98 | 98 |  |
Number of wholesale locations | property | 8 | 8 |  |
Number of retread facilities | property | 3 | 3 |  |
Dealer-operated automotive repair centers | property | 2 | 2 |  |
Number of States in which Entity Operates | state | 32 | 32 |  |
Number of operating segments | segment |  | 1 |  |
Total assets | $ 2,049,457,000 | $ 2,049,457,000 | $ 1,312,288,000 |
Total liabilities | 1,315,017,000 | 1,315,017,000 | 612,778,000 |
Operating lease right-of-use assets | 199,729,000 | 199,729,000 |  |
Operating lease obligations | 201,135,000 | 201,135,000 |  |
Finance lease asset | 196,575,000 | 196,575,000 | 128,029,000 |
Finance lease liability | $ 330,630,000 | 330,630,000 |  |
Barter credits |  | 7,700,000 | 5,400,000 |
Number of stores expected to close | store | 36 |  |  |
Impairment of long-lived assets |  | 6,579,000 | 0 | $ 0
Impairment of long-lived assets, related to store closures |  | $ 4,300,000 |  |
Number of reporting units | item |  | 1 |  |
Impairment of intangible assets |  | $ 0 | 0 | $ 0
Advertising expenses amortization period |  | 2 months |  |
Adoption of new accounting principle |  |  | (582,000) |
Operating Lease ROU Assets [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Impairment of long-lived assets |  | $ 4,400,000 |  |
Finance Lease ROU Assets [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Impairment of long-lived assets |  | 600,000 |  |
Leasehold Improvements And Equipment [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Impairment of long-lived assets |  | $ 1,600,000 |  |
Accounting Standards Update 2016-02 [Member] |  |  |  |
Significant Accounting Policies [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 |
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 |
Assets related to finance lease construction |  |  | 11,100,000 |
Lease financial obligations |  |  | 18,600,000 |
Adoption of new accounting principle |  |  | (600,000) |
Stock Options [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Options award vesting period |  | 4 years |  |
Senior Management [Member] | Restricted Stock [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Options award vesting period |  | 3 years |  |
Maximum [Member] | Stock Options [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Options award vesting period |  | 4 years |  |
Maximum [Member] | Restricted Stock [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Options award vesting period |  | 4 years |  |
Minimum [Member] | Stock Options [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Options award vesting period |  | 3 years |  |
Minimum [Member] | Restricted Stock [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Options award vesting period |  | 3 years |  |
Buildings and Improvements [Member] | Maximum [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Useful lives |  | 39 years |  |
Buildings and Improvements [Member] | Minimum [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Useful lives |  | 10 years |  |
Machinery, Fixtures And Equipment [Member] | Maximum [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Useful lives |  | 15 years |  |
Machinery, Fixtures And Equipment [Member] | Minimum [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Useful lives |  | 3 years |  |
Vehicles [Member] | Maximum [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Useful lives |  | 10 years |  |
Vehicles [Member] | Minimum [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Useful lives |  | 5 years |  |
Computer Hardware And Software [Member] | Maximum [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Useful lives |  | 7 years |  |
Computer Hardware And Software [Member] | Minimum [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Useful lives |  | 3 years |  |
Leased Stores [Member] | Accounting Standards Update 2016-02 [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Finance lease asset |  |  | 8,400,000 |
Finance lease liability |  |  | $ 16,600,000 |

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