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Stockholders' Equity and Stock Compensation Plans (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 29, 2015 | Mar. 30, 2014 | Mar. 29, 2015 | Mar. 30, 2014
Stockholders' Equity and Stock Compensation Plans |  |  |  |
Stock-based compensation expense | $ 2.6 us-gaap_AllocatedShareBasedCompensationExpense | $ 3.2 us-gaap_AllocatedShareBasedCompensationExpense | $ 5.4 us-gaap_AllocatedShareBasedCompensationExpense | $ 5.5 us-gaap_AllocatedShareBasedCompensationExpense
Options granted (in shares) |  |  | 266,420 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod |
Restricted stock award |  |  |  |
Exercise price of stock options granted (in dollars per share) |  |  | $ 27.26 ttek_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePriceDuringThePeriod |
Weighted-average fair value of stock options granted (in dollars per share) |  |  | $ 8.20 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue |
Executive officers and employees |  |  |  |
Restricted stock award |  |  |  |
Vesting period |  |  | 4 years |
Non-employee director |  |  |  |
Restricted stock award |  |  |  |
Vesting period |  |  | 1 year |
Performance-based restricted stock |  |  |  |
Restricted stock award |  |  |  |
Percentage of shares that ultimately vest depending on fiscal year earnings per share growth rates |  |  | 50.00%ttek_ShareBasedCompensationArrangementPercentageOfAwardedSharesThatUltimatelyVests1 / us-gaap_AwardTypeAxis = ttek_RestrictedStockPerformanceBasedAwardMember |
Percentage of shares that ultimately vest depending on fiscal year shareholder vesting period |  |  | 50.00%ttek_ShareBasedCompensationArrangementPercentageOfAwardedSharesThatUltimatelyVests2 / us-gaap_AwardTypeAxis = ttek_RestrictedStockPerformanceBasedAwardMember |
Performance-based restricted stock | Non-employee directors and executive officers |  |  |  |
Restricted stock award |  |  |  |
Granted (in shares) |  |  | 155,265 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = ttek_RestrictedStockPerformanceBasedAwardMember / us-gaap_TitleOfIndividualAxis = ttek_DirectorAndExecutiveOfficerMember |
Granted, fair value (in dollars per share) |  |  | $ 27.26 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = ttek_RestrictedStockPerformanceBasedAwardMember / us-gaap_TitleOfIndividualAxis = ttek_DirectorAndExecutiveOfficerMember |
Vesting period |  |  | 3 years |
Time-based restricted stock | Non-employee directors, executive officers and employees |  |  |  |
Restricted stock award |  |  |  |
Granted (in shares) |  |  | 239,747 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = ttek_RestrictedStockTimeBasedAwardMember / us-gaap_TitleOfIndividualAxis = ttek_DirectorExecutiveOfficerAndEmployeesMember |
Granted, fair value (in dollars per share) |  |  | $ 27.26 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = ttek_RestrictedStockTimeBasedAwardMember / us-gaap_TitleOfIndividualAxis = ttek_DirectorExecutiveOfficerAndEmployeesMember |

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- Definition The weighted average price at which grantees could acquire the shares reserved for issuance on stock options awarded under the plan during the period. + References No definition available. + Details
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- Definition Represents the percentage of performance-based shares that ultimately vests, depending upon the fiscal year growth in the diluted earnings per share. + References No definition available. + Details
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- Definition Represents the percentage of performance-based shares that ultimately vests, depending upon the fiscal year shareholder return over the vesting period of the reporting entity. + References No definition available. + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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