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Acquisitions (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jul. 30, 2016 | Jan. 28, 2017 | Jan. 23, 2016 | Oct. 24, 2015 | Jan. 28, 2017 | Jan. 23, 2016
Business Acquisition [Line Items] |  |  |  |  |  |
Purchase price allocation adjustments |  |  |  |  | $ 2,501 |
Amortization of intangible assets |  | $ 6,100 | $ 4,700 |  | 12,300 | $ 9,500
TelCom Construction, Inc. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Payment to acquire business, net of cash acquired |  |  |  | $ 48,800 |  |
NextGen Telecom Services Group, Inc. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Payment to acquire business, net of cash acquired | $ 5,600 |  |  |  |  |
Goodman Networks, Inc. Wireline Operations |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Payment to acquire business, net of cash acquired | 107,500 |  |  |  |  |
Escrow Deposit |  | 20,000 |  |  | 20,000 |
Goodman Networks, Inc. Wireline Operations | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Purchase price allocation adjustments |  |  |  |  | 2,500 |
Working Capital Adjustment [Member] | Goodman Networks, Inc. Wireline Operations |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Consideration Transferred | $ 6,600 |  |  |  |  |
Indemnification Portion Subject to Certain Conditions, Not Less Than Twelve Months | Goodman Networks, Inc. Wireline Operations |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Escrow Deposit |  | 10,000 |  |  | 10,000 |
Indemnification Portion Subject to Seller Satisfaction of Certain Liabilities | Goodman Networks, Inc. Wireline Operations |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Escrow Deposit |  | 10,000 |  |  | 10,000 |
Seller Liability, Satisfaction Required for Contingent Consideration |  | $ 31,700 |  |  | $ 31,700 |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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