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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 $ 2.6us-gaap_AllocatedShareBasedCompensationExpense $ 3.2us-gaap_AllocatedShareBasedCompensationExpense $ 5.4us-gaap_AllocatedShareBasedCompensationExpense $ 5.5us-gaap_AllocatedShareBasedCompensationExpense
Options granted (in shares)     266,420us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod  
Restricted stock award        
Exercise price of stock options granted (in dollars per share)     $ 27.26ttek_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePriceDuringThePeriod  
Weighted-average fair value of stock options granted (in dollars per share)     $ 8.20us-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)     155,265us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= ttek_RestrictedStockPerformanceBasedAwardMember
/ us-gaap_TitleOfIndividualAxis
= ttek_DirectorAndExecutiveOfficerMember
 
Granted, fair value (in dollars per share)     $ 27.26us-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)     239,747us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= ttek_RestrictedStockTimeBasedAwardMember
/ us-gaap_TitleOfIndividualAxis
= ttek_DirectorExecutiveOfficerAndEmployeesMember
 
Granted, fair value (in dollars per share)     $ 27.26us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= ttek_RestrictedStockTimeBasedAwardMember
/ us-gaap_TitleOfIndividualAxis
= ttek_DirectorExecutiveOfficerAndEmployeesMember