XML 61 R39.htm IDEA: XBRL DOCUMENT
v3.25.3

Acquisitions and Divestitures (Tables) | 12 Months Ended
--- | ---
Sep. 28, 2025
Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract] |
Summary of preliminary purchase price allocation | The table below represents the purchase price allocation for RPS based on estimates, assumptions, valuations and other analyses as of January 23, 2023. The all cash purchase consideration, excluding the aforementioned forward contract gain, was allocated to the tangible and intangible assets, and liabilities of RPS based on their estimated fair values, with any excess purchase consideration allocated to goodwill as follows (in thousands):
| Amount
Cash and cash equivalents | $ | 32,093 |
Accounts receivable and contract assets | 202,303 |
Prepaid expenses and other current assets | 45,999 |
Income taxes receivables | 1,999 |
Property and equipment | 38,435 |
Right-of-use assets, operating leases | 40,179 |
Intangible assets | 174,094 |
Deferred income taxes | 35,084 |
Other long-term assets | 1,061 |
Total assets acquired | 571,247 |
Account payable | $ | (44,376) |
Accrued compensation | (19,073) |
Contract liabilities | (46,287) |
Income tax payable | (7,083) |
Short-term lease liabilities, operating leases | (13,477) |
Other current liabilities | (135,474) |
Current portion of long-term debt | (91,973) |
Long-term lease liabilities, operating leases | (26,702) |
Other long-term liabilities | (13,742) |
Deferred tax liabilities | (41,613) |
Total liabilities assumed | (439,800) |
Fair value of net assets acquired | 131,447 |
Goodwill | 652,762 |
Total purchase consideration | $ | 784,209 |
Summary of fair value assigned to acquired intangible assets | The following table summarizes the estimated fair values that were assigned to intangible assets at the acquisition date:
| Fair Value | Weighted-Average Estimated Useful Life
| (in thousands) | (in years)
Backlog | $ | 27,880 |  | 1.6
Trade names | 27,260 |  | 3.0
Client relations | 118,954 |  | 11.1
Total intangible assets acquired | $ | 174,094 |  | 8.3
Summary of supplemental consolidated financial results | Following are the supplemental consolidated financial results of Tetra Tech and RPS on an unaudited pro forma basis, as if the RPS acquisition had been consummated as of the beginning of fiscal 2023 (in tho usands):
| Fiscal Year Ended
| October 1, 2023
Revenue | $ | 4,780,404 |
Net income including noncontrolling interests | 223,857 |
Summary of estimated contingent earn out liabilities | The following table summarizes the changes in the fair value of estimated contingent consideration (in thousands):
| Fiscal Year Ended
| September 28, 2025 |  | September 29, 2024 |  | October 1, 2023
Beginning balance | $ | 48,746 |  |  | $ | 73,422 |  |  | $ | 65,566 |
Estimated earn-out liabilities for acquisitions | 43,493 |  |  | 23,038 |  |  | 12,248 |
Payments of contingent consideration | (26,225) |  |  | (54,050) |  |  | (21,328) |
Adjustments to fair value reported in earnings | (12,228) |  |  | 2,541 |  |  | 12,255 |
Interest accretion expense | 2,661 |  |  | 2,639 |  |  | 2,480 |
Effect of foreign currency exchange rate changes | 514 |  |  | 1,156 |  |  | 2,201 |
Ending balance | $ | 56,961 |  |  | $ | 48,746 |  |  | $ | 73,422 |
Maximum potential payout at end of period | $ | 120,182 |  |  | $ | 102,006 |  |  | $ | 113,820 |

X
- Definition Tabular information of changes in contingent earn-out liabilities. + References No definition available. + Details
Name: | ttek_ScheduleOfEstimatedContingentEarnOutLiabilitiesTableTextBlock
Namespace Prefix: | ttek_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of pro forma revenue and earnings for business combination or aggregate of series of individually immaterial business combinations. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 805 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479328/805-10-50-8 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 805 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 49 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479303/805-10-55-49 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 805 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479328/805-10-50-3 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h)(2) -SubTopic 10 -Topic 805 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479328/805-10-50-2 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h)(3) -SubTopic 10 -Topic 805 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479328/805-10-50-2 + Details
Name: | us-gaap_BusinessAcquisitionProFormaInformationTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_BusinessCombinationAndAssetAcquisitionAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the characteristics, including initial carrying value, residual amount, weighted average useful life, of finite-lived intangible assets acquired during the period by major class. A major class is composed of intangible assets that can be grouped together because they are similar, either by nature or by their use in the operations of the company. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482665/350-30-50-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482665/350-30-50-1 + Details
Name: | us-gaap_ScheduleOfAcquiredFiniteLivedIntangibleAssetsByMajorClassTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of asset acquired and liability assumed in business combination and recognized at acquisition date. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 805 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479907/805-20-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 805 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479907/805-20-50-1 + Details
Name: | us-gaap_ScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration