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Accounting Standards - Narratives (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jan. 27, 2018 | Jan. 26, 2019 | Jul. 29, 2017 | Jul. 30, 2016 | Jan. 27, 2019 | Jan. 28, 2018 | Jul. 25, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Restricted Cash | $ 6,200 |  | $ 5,400 | $ 5,000 |  |  | $ 4,500
Payment for Debt Extinguishment or Debt Prepayment Cost, financing | 0 | $ 0 | $ 0 | 14,243 |  |  |
Accounts Receivable, Net, Current | 318,684 | 625,258 |  |  |  | $ 630,400 |
Contract with Customer, Asset, Gross | $ 369,472 | 215,849 |  |  |  | 57,800 |
Calculated under Revenue Guidance in Effect before Topic 606 [Member] |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Accounts Receivable, Net, Current |  | 341,795 |  |  |  |  |
Contract with Customer, Asset, Gross |  | 499,312 |  |  |  |  |
Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Accounts Receivable, Net, Current |  | 283,463 |  |  |  | $ 311,700 |
Contract with Customer, Asset, Gross |  | $ (283,463) |  |  |  |  |
Scenario, Forecast | Subsequent Event | Minimum |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Operating Lease, Right-of-Use Asset |  |  |  |  | $ 70,000 |  |
Operating Lease, Liability |  |  |  |  | 70,000 |  |
Scenario, Forecast | Subsequent Event | Maximum [Member] |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Operating Lease, Right-of-Use Asset |  |  |  |  | 75,000 |  |
Operating Lease, Liability |  |  |  |  | $ 75,000 |  |
Restatement Adjustment |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Payment for Debt Extinguishment or Debt Prepayment Cost, financing |  |  |  | $ 14,200 |  |  |

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- Definition Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130549-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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