XML 31 R43.htm IDEA: XBRL DOCUMENT v3.3.0.814

Acquisitions (Details) $ in Millions	3 Months Ended
	Jan. 23, 2016 USD ($)	Oct. 24, 2015 USD ($)	Jul. 25, 2015 USD ($)	Jan. 24, 2015 USD ($) business	Oct. 25, 2014 USD ($)
TelCom Construction, Inc.
Business Acquisition [Line Items]
Payment to acquire business, net of cash acquired		$ 48.6
TelCom Construction, Inc. | Scenario, Forecast
Business Acquisition [Line Items]
Payment to acquire business, net of cash acquired	$ 0.2
Hewitt Power & Communications, Inc
Business Acquisition [Line Items]
Payment to acquire business, net of cash acquired					$ 8.0
Cable Installation Contractors
Business Acquisition [Line Items]
Payment to acquire business, net of cash acquired				$ 1.5
Number of businesses acquired | business				2
Moll's Utility Services, LLC
Business Acquisition [Line Items]
Payment to acquire business, net of cash acquired			$ 6.5
Venture Communications Group, LLC
Business Acquisition [Line Items]
Payment to acquire business, net of cash acquired			$ 15.6

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_BusinessAcquisitionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The number of businesses acquired by the entity during the period.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfBusinessesAcquired
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Glossary Investing Activities



-URI http://asc.fasb.org/extlink&oid=6516133



Reference 2: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 230



-SubTopic 10



-Section 45



-Paragraph 13



-Subparagraph (b)



-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585

+ Details

Name:	us-gaap_PaymentsToAcquireBusinessesGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=dy_TelComConstructionInc.Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementScenarioAxis=us-gaap_ScenarioForecastMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=dy_HewittPowerCommunicationsIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=dy_ConnectCableContractorsInc.andSystemsCommunicationsServicesInc.Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=dy_MollsUtilityServicesLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=dy_VentureCommunicationsGroupLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: