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Commitments and Contingencies	6 Months Ended
Commitments and Contingencies	Apr. 01, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies We are subject to certain claims and lawsuits typically filed against the engineering, consulting and construction profession, alleging primarily professional errors or omissions. We carry professional liability insurance, subject to certain deductibles and policy limits, against such claims. However, in some actions, parties are seeking damages that exceed our insurance coverage or for which we are not insured. While management does not believe that the resolution of these claims will have a material adverse effect, individually or in aggregate, on our financial position, results of operations or cash flows, management acknowledges the uncertainty surrounding the ultimate resolution of these matters. The Civil Division of the United States Attorney's Office ("USAO") has informed us that it is currently evaluating claims for penalties and damages in connection with radiation remediation services provided by Tetra Tech EC, Inc., our subsidiary, at the former Navy base at Hunters Point in San Francisco. We have cooperated with the USAO and are engaged in ongoing discussions with the USAO concerning this matter. Based upon the discussions to date, we are currently unable to determine the probability of the outcome of this matter or the range of reasonably possible loss, if any.