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v2.4.1.9

Reportable Segments (Details 2) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 29, 2015 | Mar. 30, 2014 | Mar. 29, 2015 | Mar. 30, 2014
Revenue by client sector |  |  |  |
Threshold percentage for disclosure of revenue from a single client |  |  | 10.00%ttek_ConcentrationOfRiskRevenuePercentageMinimum |
Revenue | $ 564,763 us-gaap_SalesRevenueServicesNet | $ 586,285 us-gaap_SalesRevenueServicesNet | $ 1,145,819 us-gaap_SalesRevenueServicesNet | $ 1,232,133 us-gaap_SalesRevenueServicesNet
Revenue |  |  |  |
Revenue by client sector |  |  |  |
Number of clients exceeding threshold |  |  | 0 ttek_ConcentrationRiskNumberOfClients / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueServicesNetMember |
International |  |  |  |
Revenue by client sector |  |  |  |
Revenue | 173,680 us-gaap_SalesRevenueServicesNet / us-gaap_MajorCustomersAxis = ttek_InternationalMember | 181,570 us-gaap_SalesRevenueServicesNet / us-gaap_MajorCustomersAxis = ttek_InternationalMember | 320,741 us-gaap_SalesRevenueServicesNet / us-gaap_MajorCustomersAxis = ttek_InternationalMember | 345,504 us-gaap_SalesRevenueServicesNet / us-gaap_MajorCustomersAxis = ttek_InternationalMember
U.S. commercial |  |  |  |
Revenue by client sector |  |  |  |
Revenue | 158,156 us-gaap_SalesRevenueServicesNet / us-gaap_MajorCustomersAxis = ttek_CommercialMember | 147,854 us-gaap_SalesRevenueServicesNet / us-gaap_MajorCustomersAxis = ttek_CommercialMember | 333,339 us-gaap_SalesRevenueServicesNet / us-gaap_MajorCustomersAxis = ttek_CommercialMember | 334,150 us-gaap_SalesRevenueServicesNet / us-gaap_MajorCustomersAxis = ttek_CommercialMember
U.S. federal government |  |  |  |
Revenue by client sector |  |  |  |
Revenue | 168,250 us-gaap_SalesRevenueServicesNet / us-gaap_MajorCustomersAxis = ttek_FederalGovernmentMember | 178,341 us-gaap_SalesRevenueServicesNet / us-gaap_MajorCustomersAxis = ttek_FederalGovernmentMember | 352,436 us-gaap_SalesRevenueServicesNet / us-gaap_MajorCustomersAxis = ttek_FederalGovernmentMember | 373,525 us-gaap_SalesRevenueServicesNet / us-gaap_MajorCustomersAxis = ttek_FederalGovernmentMember
U.S. state and local government |  |  |  |
Revenue by client sector |  |  |  |
Revenue | $ 64,677 us-gaap_SalesRevenueServicesNet / us-gaap_MajorCustomersAxis = ttek_StateAndLocalGovernmentMember | $ 78,520 us-gaap_SalesRevenueServicesNet / us-gaap_MajorCustomersAxis = ttek_StateAndLocalGovernmentMember | $ 139,303 us-gaap_SalesRevenueServicesNet / us-gaap_MajorCustomersAxis = ttek_StateAndLocalGovernmentMember | $ 178,954 us-gaap_SalesRevenueServicesNet / us-gaap_MajorCustomersAxis = ttek_StateAndLocalGovernmentMember

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- Definition Aggregate revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(d)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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