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Quarterly Financial Data (Unaudited) - Narratives (Details) - USD ($) $ in Thousands |  | 6 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 25, 2019 | Jan. 27, 2018 | Jan. 26, 2019 | Jan. 28, 2018 | Jul. 29, 2017 | Jul. 30, 2016 | Jul. 15, 2015
Interim Period, Costs Not Allocable [Line Items] |  |  |  |  |  |  |
Accounts Receivable, Net |  | $ 318,700 | $ 625,258 | $ 630,400 |  |  |
Accounts Receivable, Net, Current |  | 318,684 | 625,258 | $ 630,400 |  |  |
Bad debt expense, net |  | (38) | $ 27 |  |  |  |
Tax Cuts and Jobs Act of 2017, adjustment to income tax liability |  | 32,200 |  |  |  |  |
Tax benefit from exercise of stock options |  | $ 7,800 |  |  |  |  |
7.125% Senior Subordinated Notes |  |  |  |  |  |  |
Interim Period, Costs Not Allocable [Line Items] |  |  |  |  |  |  |
Debt, interest rate (in percent) |  | 7.125% | 7.125% |  | 7.125% | 7.125% | 7.125%
Windstream |  |  |  |  |  |  |
Interim Period, Costs Not Allocable [Line Items] |  |  |  |  |  |  |
Accounts Receivable, Net |  |  | $ 45,000 |  |  |  |
Subsequent Event | Windstream |  |  |  |  |  |  |
Interim Period, Costs Not Allocable [Line Items] |  |  |  |  |  |  |
Bad debt expense, net | $ 17,200 |  |  |  |  |  |

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