| Assets | — | — |
| Current assets | — | — |
| Cash and cash equivalents | 232.69a | 168.83a |
| Accounts receivable, net | 1,051.46a | 974.54a |
| Contract assets | 129.68a | 113.94a |
| Prepaid expenses and other current assets | 91.59a | 89.1a |
| Income taxes receivable | 21.97a | 9.62a |
| Total current assets | 1,527.38a | 1,356.02a |
| Property and equipment, net | 73.07a | 74.83a |
| Right-of-use assets, operating leases | 177.95a | 175.93a |
| Goodwill | 2,046.57a | 1,880.24a |
| Intangible assets, net | 160.59a | 173.94a |
| Deferred tax assets | 105.53a | 89a |
| Other non-current assets | 101.6a | 70.51a |
| Total assets | 4,192.68a | 3,820.48a |
| Liabilities and equity | — | — |
| Current liabilities | — | — |
| Accounts payable | 197.44a | 173.27a |
| Accrued compensation | 332.1a | 302.76a |
| Contract liabilities | 351.74a | 335.04a |
| Short-term lease liabilities, operating leases | 63.42a | 65.01a |
| Current contingent earn-out liabilities | 26.93a | 51.11a |
| Other current liabilities | 247.9a | 280.96a |
| Total current liabilities | 1,219.53a | 1,208.14a |
| Deferred tax liabilities | 30.16a | 14.26a |
| Long-term debt | 812.63a | 879.53a |
| Long-term lease liabilities, operating leases | 140.1a | 144.69a |
| Non-current contingent earn-out liabilities | 21.81a | 22.31a |
| Other non-current liabilities | 138.03a | 148.05a |
| Equity | — | — |
| Preferred stock | 0a | 0a |
| Common stock | 2.68a | 2.66a |
| Additional paid-in capital | 35.9a | 0a |
| Accumulated other comprehensive loss | -78.88a | -195.3a |
| Retained earnings | 1,870.62a | 1,596.07a |
| Tetra Tech stockholders' equity | 1,830.32a | 1,403.43a |
| Noncontrolling interests | 0.09a | 0.07a |
| Total stockholders' equity | 1,830.41a | 1,403.51a |
| Total liabilities and stockholders' equity | 4,192.68a | 3,820.48a |