XML 28 R61.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Concentration of Credit Risk (Details) (USD $) In Millions, unless otherwise specified |  | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 25, 2014 Customers | Oct. 25, 2014 Customer Concentration Risk Five Unnamed Customers | Oct. 26, 2013 Customer Concentration Risk Five Unnamed Customers | Oct. 25, 2014 Sales Revenue, Services, Net Customer Concentration Risk AT&T | Oct. 26, 2013 Sales Revenue, Services, Net Customer Concentration Risk AT&T | Oct. 25, 2014 Sales Revenue, Services, Net Customer Concentration Risk CenturyLink | Oct. 26, 2013 Sales Revenue, Services, Net Customer Concentration Risk CenturyLink | Oct. 25, 2014 Sales Revenue, Services, Net Customer Concentration Risk Comcast | Oct. 26, 2013 Sales Revenue, Services, Net Customer Concentration Risk Comcast | Oct. 25, 2014 Trade Accounts Receivable and Costs and Estimated Earnings Customer Concentration Risk AT&T | Jul. 26, 2014 Trade Accounts Receivable and Costs and Estimated Earnings Customer Concentration Risk AT&T | Oct. 25, 2014 Trade Accounts Receivable and Costs and Estimated Earnings Customer Concentration Risk CenturyLink | Jul. 26, 2014 Trade Accounts Receivable and Costs and Estimated Earnings Customer Concentration Risk CenturyLink | Oct. 25, 2014 Trade Accounts Receivable and Costs and Estimated Earnings Customer Concentration Risk Comcast | Jul. 26, 2014 Trade Accounts Receivable and Costs and Estimated Earnings Customer Concentration Risk Comcast
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of customers classified as highly concentrated | 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk percentage |  | 59.40% | 57.20% | 21.20% | 17.50% | 13.10% | 15.50% | 12.80% | 10.50% | 18.50% | 17.90% | 10.80% | 9.80% | 10.60% | 9.90%
Accounts receivable, costs, and estimated earnings in excess of billings |  |  |  |  |  |  |  |  |  | $ 100.3 | $ 87.6 | $ 58.2 | $ 48.2 | $ 57.1 | $ 48.9

X
- 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. This also includes the amount included in cost of uncompleted contracts in excess of related billings, or unbilled accounts receivable. + References No definition available. + Details
Name: | dy_ConcentrationRiskAmount
Namespace Prefix: | dy_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The number of customers classified as highly concentrated in comparison to total revenue. + References No definition available. + Details
Name: | dy_NumberOfCustomersClassifiedAsHighlyConcentrated
Namespace Prefix: | dy_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_ConcentrationRiskLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13537-108611 Reference 2: 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=6927468&loc=d3e6404-108592 Reference 3: 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=35750535&loc=d3e13531-108611 Reference 4: 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=6927468&loc=d3e6351-108592 + Details
Name: | us-gaap_ConcentrationRiskPercentage1
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration