| Component: (Network and Table) | |
|---|---|
| Network | 00500 - Statement - Consolidated Statements of Cash Flows (http://www.tetratech.com/role/StatementConsolidatedStatementsOfCashFlows)  | 
| Table | (Implied) | 
| Reporting Entity [Axis] | 0000831641 (http://www.sec.gov/CIK) | 
| Consolidated Statements of Cash Flows | Period [Axis] | ||
|---|---|---|---|
2015-09-28 - 2016-10-02  | 2014-09-29 - 2015-09-27  | 2013-09-30 - 2014-09-28  | |
Consolidated Statements of Cash Flows  | |||
Cash flows from operating activities:  | |||
Net income including noncontrolling interests  | 83,853,000    | 39,228,000    | 108,675,000    | 
Adjustments to reconcile net income to net cash from operating activities:  | |||
Depreciation and amortization  | |||
Equity in income of unconsolidated joint ventures  | (  | (  | (  | 
Distributions of earnings from unconsolidated joint ventures  | |||
Stock-based compensation  | |||
Excess tax benefits from stock-based compensation  | (  | (  | (  | 
Deferred income taxes  | (  | ||
Provision for doubtful accounts  | (  | ||
Impairment of goodwill and other intangible assets  | 60,763,000    | ||
Fair value adjustments to contingent consideration  | 2,823,000    | (3,113,000)   | (58,694,000)   | 
Lease termination costs and related asset impairment  | |||
(Gain) loss on disposal of property and equipment  | (  | (  | |
Changes in operating assets and liabilities, net of effects of business acquisitions:  | |||
Accounts receivable  | (  | ||
Prepaid expenses and other assets  | (  | ||
Accounts payable  | (  | (  | |
Accrued compensation  | (  | (  | |
Billings in excess of costs on uncompleted contracts  | (  | (  | |
Other liabilities  | (  | (  | (  | 
Income taxes receivable/payable  | (  | ||
Net cash provided by operating activities  | |||
Cash flows from investing activities:  | |||
Capital expenditures  | (  | (  | (  | 
Payments for business acquisitions, net of cash acquired  | (  | (  | (  | 
Changes in restricted cash  | (  | ||
Proceeds from sale of property and equipment  | |||
Payment received on note from sale of operation  | |||
Investments in unconsolidated joint ventures  | (  | ||
Net cash used in investing activities  | (  | (  | (  | 
Cash flows from financing activities:  | |||
Payments on long-term debt  | (  | (  | (  | 
Proceeds from borrowings  | |||
Payments of contingent earn-out liabilities  | (  | (  | (  | 
Debt pre-payment costs  | (  | (  | |
Distributions paid to noncontrolling interests  | (  | (  | (  | 
Excess tax benefits from stock-based compensation  | |||
Repurchases of common stock  | (  | (  | (  | 
Net proceeds from issuance of common stock  | |||
Dividends paid  | (  | (  | (  | 
Net cash used in financing activities  | (  | (  | (  | 
Effect of foreign exchange rate changes on cash  | (  | (  | |
Net increase (decrease) in cash and cash equivalents  | (  | ||
Cash and cash equivalents at beginning of year  | 135,326,000    | ||
Cash and cash equivalents at end of year  | 160,459,000    | 135,326,000    | 122,379,000    | 
Supplemental information:  | |||
Cash paid during the period for:  | |||
Interest  | |||
Income taxes, net of refunds of $3.2 million, $5.4 million and $14.7 million  | |||