XML 74 R62.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Apr. 28, 2018 | Apr. 29, 2017 | Jan. 27, 2018
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |
Amortization of intangible assets | $ 5,700 | $ 6,200 |
Intangible Assets, Gross (Excluding Goodwill) | 327,517 |  | $ 315,217
Accumulated Amortization | 149,442 |  | 143,748
Intangible Assets, Net | 178,075 |  | 171,469
UtiliQuest |  |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |
Intangible Assets, Gross (Excluding Goodwill) | 4,700 |  | 4,700
Accumulated Amortization | 0 |  | 0
Intangible Assets, Net | $ 4,700 |  | 4,700
Customer relationships |  |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |
Usesul life | 11 years 8 months 6 days |  |
Intangible Assets, Gross (Excluding Goodwill) | $ 312,017 |  | 299,717
Accumulated Amortization | 141,096 |  | 135,544
Intangible Assets, Net | $ 170,921 |  | 164,173
Trade names |  |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |
Usesul life | 8 years 3 months 24 days |  |
Intangible Assets, Gross (Excluding Goodwill) | $ 10,350 |  | 10,350
Accumulated Amortization | 7,992 |  | 7,872
Intangible Assets, Net | $ 2,358 |  | 2,478
Non-compete agreements |  |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |
Usesul life | 2 years 2 months 12 days |  |
Intangible Assets, Gross (Excluding Goodwill) | $ 450 |  | 450
Accumulated Amortization | 354 |  | 332
Intangible Assets, Net | $ 96 |  | $ 118

X
- Definition Finite-Lived and Indefinite-Lived Intangible Assets + References No definition available. + Details
Name: | dy_FiniteLivedAndIndefiniteLivedIntangibleAssetsLineItems
Namespace Prefix: | dy_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_AmortizationOfIntangibleAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
Name: | us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Remaining amortization period of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_FiniteLivedIntangibleAssetsRemainingAmortizationPeriod1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount before accumulated amortization of intangible assets, excluding goodwill. + References No definition available. + Details
Name: | us-gaap_IntangibleAssetsGrossExcludingGoodwill
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
Name: | us-gaap_IntangibleAssetsNetExcludingGoodwill
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis=dy_UtiliquestMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_CustomerRelationshipsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_TradeNamesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_NoncompeteAgreementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |