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Accounting Policies - Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands | 3 Months Ended |
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Jul. 28, 2018 | Apr. 27, 2019
Recent Accounting Pronouncements |  |
Lease liability |  | $ 392,220
Retained Earnings | ASU 2016-01 - Investments |  |
Recent Accounting Pronouncements |  |
Reclassification of net unrealized gains, before tax | $ 2,100 |
Reclassification of tax expense | 500 |
Accumulated Other Comprehensive Income (Loss) | ASU 2016-01 - Investments |  |
Recent Accounting Pronouncements |  |
Reclassification of net unrealized gains, before tax | (2,100) |
Reclassification of tax expense | $ (500) |
Restatement Adjustment | Minimum | ASU 2016-02 |  |
Recent Accounting Pronouncements |  |
Right of use asset |  | 300,000
Lease liability |  | 0
Restatement Adjustment | Maximum | ASU 2016-02 |  |
Recent Accounting Pronouncements |  |
Right of use asset |  | (325,000)
Lease liability |  | $ 0

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