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Mergers and Acquisitions - Components of Acquisition and Integration Expenses (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 26, 2016 | Mar. 27, 2016 | Jun. 26, 2016 | Oct. 02, 2016
Mergers and Acquisitions |  |  |  |
Severance including change in control payments | $ 1,005 |  | $ 8,285 |
Professional services |  |  | 5,685 |
Real estate-related |  |  | 2,946 |
Total | $ 1,005 |  | $ 16,916 |
Payments for acquisition and integration-related expenses |  |  |  | $ 16,900
Coffey | Interest expense |  |  |  |
Mergers and Acquisitions |  |  |  |
Pre-payment charges paid |  | $ 1,900 |  |

X
- Definition This element represents acquisition and integration -related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References No definition available. + Details
Name: | ttek_BusinessCombinationAcquisitionAndIntegrationRelatedCosts
Namespace Prefix: | ttek_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Professional service costs incurred for acquisition and integration of other business entity. + References No definition available. + Details
Name: | ttek_BusinessCombinationProfessionalServiceCost
Namespace Prefix: | ttek_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of real estate related costs incurred for acquisition of other business entity. + References No definition available. + Details
Name: | ttek_BusinessCombinationRealEstateRelatedCosts
Namespace Prefix: | ttek_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents severance including change in control payments as part of acquisition and integration expenses. + References No definition available. + Details
Name: | ttek_BusinessCombinationSeveranceIncludingChangeInControlPayments
Namespace Prefix: | ttek_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The cash outflow during the period associated with acquisition and integration-related costs resulting from a business combination. + References No definition available. + Details
Name: | ttek_CashPaidToAcquireBusinessesAcquisitionAndIntegrationCosts
Namespace Prefix: | ttek_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents pre-payment charges paid for early closure of debt. + References No definition available. + Details
Name: | ttek_DebtPrePaymentChargesPaid
Namespace Prefix: | ttek_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_InterestExpenseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |