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Stockholders' Equity and Stock Compensation Plans (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended
Dec. 28, 2014
Dec. 29, 2013
Stockholders' Equity and Stock Compensation Plans    
Stock-based compensation expense $ 2.8us-gaap_AllocatedShareBasedCompensationExpense $ 2.3us-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  
Non-employee 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) 239,247us-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