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Goodwill and Intangible Assets (Details) (USD $) | 0 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Sep. 29, 2014 | Jun. 30, 2014 | Mar. 29, 2015 | Sep. 28, 2014
Goodwill information |  |  |  |
Goodwill |  |  | $ 671,397,000 us-gaap_Goodwill |
Goodwill |  |  |  |
Balance at beginning of the period | 714,190,000 us-gaap_Goodwill |  | 714,190,000 us-gaap_Goodwill |
Foreign exchange translation |  |  | (42,793,000)us-gaap_GoodwillTranslationAdjustments |
Balance at end of the period |  |  | 671,397,000 us-gaap_Goodwill |
Impairment of goodwill | 0 us-gaap_GoodwillImpairmentLoss | 0 us-gaap_GoodwillImpairmentLoss |  |
WEI |  |  |  |
Goodwill information |  |  |  |
Goodwill |  |  | 222,558,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ttek_WaterEnvironmentAndInfrastructureMember |
Goodwill |  |  |  |
Balance at beginning of the period | 238,086,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ttek_WaterEnvironmentAndInfrastructureMember |  | 238,086,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ttek_WaterEnvironmentAndInfrastructureMember |
Foreign exchange translation |  |  | (15,528,000)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = ttek_WaterEnvironmentAndInfrastructureMember |
Balance at end of the period |  |  | 222,558,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ttek_WaterEnvironmentAndInfrastructureMember |
Gross amounts of goodwill |  |  | 253,700,000 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = ttek_WaterEnvironmentAndInfrastructureMember | 269,200,000 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = ttek_WaterEnvironmentAndInfrastructureMember
Accumulated impairment |  |  | 31,100,000 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = ttek_WaterEnvironmentAndInfrastructureMember | 31,100,000 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = ttek_WaterEnvironmentAndInfrastructureMember
RME |  |  |  |
Goodwill information |  |  |  |
Goodwill |  |  | 448,839,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ttek_ResourceManagementAndEnergyMember |
Goodwill |  |  |  |
Balance at beginning of the period | 476,104,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ttek_ResourceManagementAndEnergyMember |  | 476,104,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ttek_ResourceManagementAndEnergyMember |
Foreign exchange translation |  |  | (27,265,000)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = ttek_ResourceManagementAndEnergyMember |
Balance at end of the period |  |  | 448,839,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ttek_ResourceManagementAndEnergyMember |
Gross amounts of goodwill |  |  | 475,200,000 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = ttek_ResourceManagementAndEnergyMember | 502,500,000 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = ttek_ResourceManagementAndEnergyMember
Accumulated impairment |  |  | $ 26,400,000 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = ttek_ResourceManagementAndEnergyMember | $ 26,400,000 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = ttek_ResourceManagementAndEnergyMember

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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- Definition Amount before accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a,h) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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