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New Accounting Pronouncements - Schedule of Impact of Adoption of New Revenue Standard on Consolidated Statements of Operations Line Items (Detail) - 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
Revenue Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |
Revenue | $ 383,494 |  |  | $ 361,254 |  |  | $ 929,017 | $ 868,780
Cost of sales | 285,784 |  |  | 270,567 |  |  | 693,627 | 649,551
Income from operations | 28,742 |  |  | 26,598 |  |  | 47,954 | 46,235
Income before income tax provision | 25,806 |  |  | 24,099 |  |  | 39,469 | 38,354
Income tax provision | 6,719 |  |  | 6,723 |  |  | 10,169 | 10,582
Net income | 19,087 | $ 5,303 | $ 4,910 | $ 17,376 | $ 6,184 | $ 4,212 | 29,300 | $ 27,772
Balances without adoption of ASC Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] |  |  |  |  |  |  |  |
Revenue Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |
Revenue | 383,040 |  |  |  |  |  | 929,069 |
Cost of sales | 285,530 |  |  |  |  |  | 693,879 |
Income from operations | 28,542 |  |  |  |  |  | 47,754 |
Income before income tax provision | 25,606 |  |  |  |  |  | 39,269 |
Income tax provision | 6,673 |  |  |  |  |  | 10,123 |
Net income | 18,933 |  |  |  |  |  | 29,146 |
Impact of adoption Higher/(Lower) [Member] | Accounting Standards Update 2014-09 [Member] |  |  |  |  |  |  |  |
Revenue Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |
Revenue | 454 |  |  |  |  |  | (52) |
Cost of sales | 254 |  |  |  |  |  | (252) |
Income from operations | 200 |  |  |  |  |  | 200 |
Income before income tax provision | 200 |  |  |  |  |  | 200 |
Income tax provision | 46 |  |  |  |  |  | 46 |
Net income | $ 154 |  |  |  |  |  | $ 154 |

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