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Earnings Per Share (Details) (USD $)
In Thousands, except Share data
3 Months Ended12 Months Ended
Oct. 02, 2011
Jul. 03, 2011
Apr. 03, 2011
Jan. 02, 2011
Oct. 03, 2010
Jun. 27, 2010
Mar. 28, 2010
Dec. 27, 2009
Oct. 02, 2011
Oct. 03, 2010
Sep. 27, 2009
Number of weighted-average shares used to compute basic and diluted EPS:           
Net income attributable to Tetra Tech$ 26,399$ 23,839$ 17,500$ 22,301$ 23,142$ 20,639$ 14,329$ 18,709$ 90,039$ 76,819$ 87,028
Weighted-average common shares outstanding - basic62,310,00062,203,00062,121,00061,665,00061,580,00061,560,00061,511,00061,161,00062,053,00061,430,00060,135,000
Effect of diluted stock options and unvested restricted stock (in shares)        722,000657,000859,000
Weighted-average common stock outstanding - diluted (in shares)62,864,00062,934,00062,945,00062,443,00061,999,00062,181,00062,168,00062,089,00062,775,00062,087,00060,994,000
Earnings per share attributable to Tetra Tech           
Basic (in dollars per share)$ 0.42$ 0.38$ 0.28$ 0.36$ 0.38$ 0.34$ 0.23$ 0.31$ 1.45$ 1.25$ 1.45
Diluted (in dollars per share)$ 0.42$ 0.38$ 0.28$ 0.36$ 0.37$ 0.33$ 0.23$ 0.30$ 1.43$ 1.24$ 1.43
Options excluded from the calculation of dilutive potential common shares (in shares)        2,600,0003,100,0001,300,000
Unvested restricted stock, excluded from the calculation of basic EPS (in shares)174,175   166,375   174,175166,375