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Accounting Standards (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2019 | Jun. 30, 2018 | Sep. 30, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |
Costs and estimated earnings in excess of billings on uncompleted contracts | $ 14,043 |  |  |  |  |  | $ 14,043 |  | $ 9,334
Inventories | 37,069 |  |  |  |  |  | 37,069 |  | 24,556
Accrued expenses and other liabilities | 19,028 |  |  |  |  |  | 19,028 |  | 17,520
Billings in excess of costs and estimated earnings on uncompleted contracts | 32,344 |  |  |  |  |  | 32,344 |  | $ 38,738
Revenues | 227,290 |  |  | $ 195,075 |  |  | 545,921 | $ 464,395 |
Cost of revenues | 189,198 |  |  | 165,606 |  |  | 466,900 | 398,379 |
Provision (benefit) for income taxes | 4,941 |  |  | 1,409 |  |  | 8,080 | 5,382 |
Net income | 17,202 | $ 4,212 | $ 5,154 | $ 13,403 | $ 11,248 | $ 10,996 | 26,568 | $ 35,647 |
Impact of ASC 606 | Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |
Costs and estimated earnings in excess of billings on uncompleted contracts | (982) |  |  |  |  |  | (982) |  |
Inventories | 1,205 |  |  |  |  |  | 1,205 |  |
Accrued expenses and other liabilities | (29) |  |  |  |  |  | (29) |  |
Billings in excess of costs and estimated earnings on uncompleted contracts | 338 |  |  |  |  |  | 338 |  |
Revenues | (343) |  |  |  |  |  | (1,321) |  |
Cost of revenues | 311 |  |  |  |  |  | (1,205) |  |
Provision (benefit) for income taxes | 9 |  |  |  |  |  | (29) |  |
Net income | (23) |  |  |  |  |  | (87) |  |
Without Application of ASC 606 |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |
Costs and estimated earnings in excess of billings on uncompleted contracts | 15,025 |  |  |  |  |  | 15,025 |  |
Inventories | 35,864 |  |  |  |  |  | 35,864 |  |
Accrued expenses and other liabilities | 19,057 |  |  |  |  |  | 19,057 |  |
Billings in excess of costs and estimated earnings on uncompleted contracts | 32,006 |  |  |  |  |  | 32,006 |  |
Revenues | 227,633 |  |  |  |  |  | 547,242 |  |
Cost of revenues | 188,887 |  |  |  |  |  | 468,105 |  |
Provision (benefit) for income taxes | 4,932 |  |  |  |  |  | 8,109 |  |
Net income | $ 17,225 |  |  |  |  |  | $ 26,655 |  |

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