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Concentration of Credit Risk - Trade Receivable Risk (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 29, 2017 | Jul. 29, 2017 | Jul. 30, 2016
Concentration Risk [Line Items] |  |  |
Accounts receivable, net | $ 369,800 | $ 369,800 | $ 328,030
Customer Concentration Risk | Trade Accounts Receivable and Costs and Estimated Earnings |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk percentage | 10.00% |  |
Customer Concentration Risk | Trade Accounts Receivable and Costs and Estimated Earnings | Comcast Corporation |  |  |
Concentration Risk [Line Items] |  |  |
Accounts receivable, net | $ 159,700 | $ 159,700 | $ 95,300
Concentration risk percentage |  | 21.30% | 13.90%
Customer Concentration Risk | Trade Accounts Receivable and Costs and Estimated Earnings | CenturyLink, Inc. |  |  |
Concentration Risk [Line Items] |  |  |
Accounts receivable, net | 136,100 | $ 136,100 | $ 79,000
Concentration risk percentage |  | 18.10% | 11.50%
Customer Concentration Risk | Trade Accounts Receivable and Costs and Estimated Earnings | AT&T Inc. |  |  |
Concentration Risk [Line Items] |  |  |
Accounts receivable, net | 87,100 | $ 87,100 | $ 138,800
Concentration risk percentage |  | 11.60% | 20.30%
Customer Concentration Risk | Trade Accounts Receivable and Costs and Estimated Earnings | Windstream Corporation |  |  |
Concentration Risk [Line Items] |  |  |
Accounts receivable, net | 84,700 | $ 84,700 | $ 79,000
Concentration risk percentage |  | 11.30% | 11.50%
Customer Concentration Risk | Trade Accounts Receivable and Costs and Estimated Earnings | Verizon Communications Inc |  |  |
Concentration Risk [Line Items] |  |  |
Accounts receivable, net | $ 73,700 | $ 73,700 | $ 70,200
Concentration risk percentage |  | 9.80% | 10.20%

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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/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(4)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6351-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13531-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6404-108592 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13537-108611 + Details
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