XML 166 R79.htm IDEA: XBRL DOCUMENT
v3.20.4

Debt - Senior Credit Agreement (Details) |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 15, 2015 USD ($) | Jan. 25, 2020 USD ($) | Jan. 30, 2021 USD ($) | Oct. 19, 2018 USD ($)
Line of Credit Facility [Line Items] |  |  |  |
Letters of credit outstanding amount |  | $ 52,300,000 | $ 52,200,000 |
Line of Credit Facility, Remaining Borrowing Capacity |  | 287,000,000.0 | 558,700,000 |
Incremental Facility, Minimum |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Debt instrument, face amount | $ 350,000,000.0 |  |  |
Standby Letters of Credit |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  | $ 200,000,000.0
0.75% Convertible Senior Notes Due 2021 |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Debt instrument, face amount | $ 485,000,000.0 | $ 460,000,000 | $ 58,264,000 |
Debt, interest rate (in percent) | 0.75% |  | 0.75% |
Outstanding Debt Credit Agreement Threshold |  |  | $ 250,000,000.0 |
Minimum |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Debt Instrument, Covenant Compliance, Consolidated Leverage Ratio |  | 3.50 |  |
Debt Instrument, Covenant Compliance, Consolidated Interest Coverage Ratio |  | 3.00 |  |
Maximum |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Debt Instrument, Covenant Compliance, Consolidated Leverage Ratio |  | 1.00 |  |
Debt Instrument, Covenant Compliance, Consolidated Interest Coverage Ratio |  | 1.00 |  |
Credit Agreement - Term Loan (matures April 2020) |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  | 450,000,000.0
Unrestricted Cash and Cash Equivalents Credit Agreement Threshold |  |  | $ 50,000,000.0 |
Debt Instrument, Covenant Compliance, Consolidated Leverage Ratio | 2.25 |  |  |
Credit Agreement - Revolving facility (matures April 2020) |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 450,000,000.0 |  |  | $ 750,000,000.0

X
- Definition Debt Instrument, Covenant Compliance, Consolidated Interest Coverage Ratio + References No definition available. + Details
Name: | dy_DebtInstrumentCovenantComplianceConsolidatedInterestCoverageRatio
Namespace Prefix: | dy_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition Debt Instrument, Covenant Compliance, Consolidated Leverage Ratio + References No definition available. + Details
Name: | dy_DebtInstrumentCovenantComplianceConsolidatedLeverageRatio
Namespace Prefix: | dy_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition Outstanding Debt Credit Agreement Threshold + References No definition available. + Details
Name: | dy_OutstandingDebtCreditAgreementThreshold
Namespace Prefix: | dy_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Unrestricted Cash and Cash Equivalents Credit Agreement Threshold + References No definition available. + Details
Name: | dy_UnrestrictedCashandCashEquivalentsCreditAgreementThreshold
Namespace Prefix: | dy_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
Name: | us-gaap_DebtInstrumentFaceAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_CreditFacilityAxis=dy_IncrementalFacilityMinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CreditFacilityAxis=us-gaap_StandbyLettersOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=dy_A0.75ConvertibleSeniorNotesDue2021Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_SeniorLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |