XML 92 R81.htm IDEA: XBRL DOCUMENT
v3.20.2

Customer Concentration and Revenue Information - Customer Type (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Oct. 24, 2020 | Oct. 26, 2019 | Oct. 24, 2020 | Oct. 26, 2019
Concentration Risk |  |  |  |
Contract revenues | $ 810,256 | $ 884,115 | $ 2,448,500 | $ 2,602,079
% of Total | 100.00% | 100.00% | 100.00% | 100.00%
Customer Concentration Risk | Revenue Benchmark |  |  |  |
Concentration Risk |  |  |  |
% of Total |  |  | 10.00% |
Customer Concentration Risk | Revenue Benchmark | Telecommunications |  |  |  |
Concentration Risk |  |  |  |
Contract revenues | $ 721,200 | $ 798,100 | $ 2,193,900 | $ 2,363,900
% of Total | 89.00% | 90.30% | 89.60% | 90.80%
Customer Concentration Risk | Revenue Benchmark | Underground facility locating |  |  |  |
Concentration Risk |  |  |  |
Contract revenues | $ 59,000 | $ 56,000 | $ 171,300 | $ 158,000
% of Total | 7.30% | 6.30% | 7.00% | 6.10%
Customer Concentration Risk | Revenue Benchmark | Electrical and gas utilities and other |  |  |  |
Concentration Risk |  |  |  |
Contract revenues | $ 30,100 | $ 30,000 | $ 83,300 | $ 80,200
% of Total | 3.70% | 3.40% | 3.40% | 3.10%
Five Unnamed Customers | Customer Concentration Risk | Revenue Benchmark |  |  |  |
Concentration Risk |  |  |  |
% of Total |  |  | 75.60% | 78.70%

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13531-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13537-108611 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592 + Details
Name: | us-gaap_ConcentrationRiskPercentage1
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
Name: | us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_ConcentrationRiskByTypeAxis=us-gaap_CustomerConcentrationRiskMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_SalesRevenueNetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dy_CustomerTypeAxis=dy_TelecommunicationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dy_CustomerTypeAxis=dy_UndergroundFacilityLocatingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dy_CustomerTypeAxis=dy_ElectricalandGasUtilitiesandOtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_MajorCustomersAxis=dy_FiveUnnamedCustomersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |