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Quarterly Financial Information-Unaudited (Details) (USD $)
Share data in Thousands, except Per Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Sep. 29, 2013
Jun. 30, 2013
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Mar. 31, 2013
Dec. 30, 2012
Sep. 30, 2012
Jul. 01, 2012
Apr. 01, 2012
Jan. 01, 2012
Sep. 29, 2013
Sep. 30, 2012
Oct. 02, 2011
Quarterly financial information                      
Number of programs for which project charges recorded   4                  
Reduction in operating income due to project charge   $ 35,500,000                  
Reduction in operating income due to charge related to Eastern Canada and global mining operations   28,200,000                  
Operating Income (loss) 40,626,000 (99,884,000) 37,667,000 41,809,000 48,470,000 46,261,000 35,543,000 36,093,000 20,218,000 166,367,000 146,422,000
Non-cash goodwill impairment charges   56,600,000             56,600,000 914,000  
Revenue 698,376,000 614,835,000 641,999,000 658,545,000 719,405,000 684,698,000 624,345,000 682,627,000 2,613,755,000 2,711,075,000 2,573,144,000
Net income (loss) attributable to Tetra Tech 25,200,000 (78,385,000) 24,820,000 26,224,000 30,432,000 29,054,000 22,284,000 22,610,000 (2,141,000) 104,380,000 90,039,000
Net income (loss) attributable to Tetra Tech per share:                      
Basic (in dollars per share) $ 0.39 $ (1.21) $ 0.38 $ 0.41 $ 0.48 $ 0.46 $ 0.35 $ 0.36 $ (0.03) $ 1.65 $ 1.45
Diluted (in dollars per share) $ 0.39 $ (1.21) $ 0.38 $ 0.41 $ 0.47 $ 0.45 $ 0.35 $ 0.36 $ (0.03) $ 1.63 $ 1.43
Weighted-average common shares outstanding:                      
Basic (in shares) 64,272 64,832 64,551 63,864 63,623 63,387 63,072 62,433 64,544 63,217 62,053
Diluted (in shares) 64,853 64,832 65,472 64,608 64,396 64,179 63,817 63,068 64,544 63,934 62,775
RCM
                     
Quarterly financial information                      
Number of programs for which project charges recorded   3                  
Operating Income (loss)                 (6,706,000) 22,374,000 13,183,000
Revenue                 $ 725,689,000 $ 621,957,000 $ 604,651,000