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Joint Ventures (Details) (USD $) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 29, 2015 | Mar. 30, 2014 | Mar. 29, 2015 | Mar. 30, 2014 | Sep. 28, 2014
Aggregate revenue of consolidated joint ventures | $ 564,763,000 us-gaap_SalesRevenueServicesNet | $ 586,285,000 us-gaap_SalesRevenueServicesNet | $ 1,145,819,000 us-gaap_SalesRevenueServicesNet | $ 1,232,133,000 us-gaap_SalesRevenueServicesNet |
Unconsolidated Joint Ventures |  |  |  |  |
Equity in earnings from unconsolidated joint ventures | 1,200,000 us-gaap_IncomeLossFromEquityMethodInvestments | 800,000 us-gaap_IncomeLossFromEquityMethodInvestments | 1,842,000 us-gaap_IncomeLossFromEquityMethodInvestments | 1,492,000 us-gaap_IncomeLossFromEquityMethodInvestments |
Carrying value of assets of unconsolidated joint ventures | 17,600,000 us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets |  | 17,600,000 us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets |  | 20,100,000 us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets
Carrying value of liabilities of unconsolidated joint ventures | 15,400,000 us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountLiabilities |  | 15,400,000 us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountLiabilities |  | 18,000,000 us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountLiabilities
Consolidated Joint Ventures |  |  |  |  |
Aggregate revenue of consolidated joint ventures | 1,600,000 us-gaap_SalesRevenueServicesNet / dei_LegalEntityAxis = ttek_ConsolidatedJointVenturesMember | 3,500,000 us-gaap_SalesRevenueServicesNet / dei_LegalEntityAxis = ttek_ConsolidatedJointVenturesMember | 3,800,000 us-gaap_SalesRevenueServicesNet / dei_LegalEntityAxis = ttek_ConsolidatedJointVenturesMember | 6,200,000 us-gaap_SalesRevenueServicesNet / dei_LegalEntityAxis = ttek_ConsolidatedJointVenturesMember |
Cash and cash equivalents of consolidated joint ventures | $ 1,300,000 us-gaap_RestrictedCashAndCashEquivalents / dei_LegalEntityAxis = ttek_ConsolidatedJointVenturesMember |  | $ 1,300,000 us-gaap_RestrictedCashAndCashEquivalents / dei_LegalEntityAxis = ttek_ConsolidatedJointVenturesMember |  | $ 1,400,000 us-gaap_RestrictedCashAndCashEquivalents / dei_LegalEntityAxis = ttek_ConsolidatedJointVenturesMember

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- Definition This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee. + References Reference 1: 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=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 9 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35755396&loc=d3e33749-111570 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.12) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 7 + Details
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