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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. 30, 2012
item
Jul. 01, 2012
Apr. 01, 2012
Jan. 01, 2012
Oct. 02, 2011
Jul. 03, 2011
Apr. 03, 2011
Jan. 02, 2011
Sep. 30, 2012
Oct. 02, 2011
Oct. 03, 2010
Quarterly financial information                      
Reorganization costs $ 16,900,000                    
Operational income (losses) 48,470,000 46,261,000 35,543,000 36,093,000 43,433,000 39,408,000 29,256,000 34,325,000 166,367,000 146,422,000 124,474,000
Compensation-related expenses for severance and employee retention 6,400,000                    
Lease exit costs, fixed asset write-downs and other long-lived asset impairments 4,400,000                    
Number of small reporting operating units in which goodwill was impaired 1                    
Non-cash goodwill impairment charges 914,000               914,000    
Gain on estimated fair value adjustment for contingent earn-out liabilities 17,300,000               19,246,000 1,755,000 265,000
Quarterly Financial Information-Unaudited                      
Revenue 719,405,000 684,698,000 624,345,000 682,627,000 675,662,000 673,792,000 612,566,000 611,124,000 2,711,075,000 2,573,144,000 2,201,232,000
Net income attributable to Tetra Tech 30,432,000 29,054,000 22,284,000 22,610,000 26,399,000 23,839,000 17,500,000 22,301,000 104,380,000 90,039,000 76,819,000
Earnings per share attributable to Tetra Tech:                      
Basic (in dollars per share) $ 0.48 $ 0.46 $ 0.35 $ 0.36 $ 0.42 $ 0.38 $ 0.28 $ 0.36 $ 1.65 $ 1.45 $ 1.25
Diluted (in dollars per share) $ 0.47 $ 0.45 $ 0.35 $ 0.36 $ 0.42 $ 0.38 $ 0.28 $ 0.36 $ 1.63 $ 1.43 $ 1.24
Weighted-average common shares outstanding:                      
Basic (in shares) 63,623 63,387 63,072 62,433 62,310 62,203 62,121 61,665 63,217 62,053 61,430
Diluted (in shares) 64,396 64,179 63,817 63,068 62,864 62,934 62,945 62,443 63,934 62,775 62,087
India
                     
Quarterly financial information                      
Operational income (losses) $ (5,200,000)