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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 | 12 Months Ended
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Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Revenue Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 308,136 | $ 383,494 | $ 303,586 | $ 241,937 | $ 308,591 | $ 361,254 | $ 270,605 | $ 236,921 | $ 1,237,153 | $ 1,177,371 | $ 1,052,320
Cost of sales | 220,694 | 285,784 | 229,384 | 178,459 | 229,587 | 270,567 | 201,312 | 177,672 | 914,321 | 879,138 | 787,005
Income from operations | 12,578 | 28,742 | 10,226 | 8,986 | 16,948 | 26,598 | 10,634 | 9,003 | 60,532 | 63,183 | 45,289
Income before income tax provision | 9,484 | 25,806 | 7,193 | 6,470 | 14,926 | 24,099 | 7,794 | 6,461 | 48,953 | 53,280 | 37,808
Income tax provision | 2,799 | 6,719 | 1,890 | 1,560 | 3,386 | 6,723 | 1,610 | 2,249 | 12,968 | 13,968 | 14,261
Net income | $ 6,685 | $ 19,087 | $ 5,303 | $ 4,910 | $ 11,540 | $ 17,376 | $ 6,184 | $ 4,212 | 35,985 | $ 39,312 | $ 23,547
Balances without adoption of ASC Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 1,237,899 |  |
Cost of sales |  |  |  |  |  |  |  |  | 914,939 |  |
Income from operations |  |  |  |  |  |  |  |  | 60,660 |  |
Income before income tax provision |  |  |  |  |  |  |  |  | 49,081 |  |
Income tax provision |  |  |  |  |  |  |  |  | 13,002 |  |
Net income |  |  |  |  |  |  |  |  | 36,079 |  |
Impact of adoption Higher/(Lower) [Member] | Accounting Standards Update 2014-09 [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | (746) |  |
Cost of sales |  |  |  |  |  |  |  |  | (618) |  |
Income from operations |  |  |  |  |  |  |  |  | (128) |  |
Income before income tax provision |  |  |  |  |  |  |  |  | (128) |  |
Income tax provision |  |  |  |  |  |  |  |  | (34) |  |
Net income |  |  |  |  |  |  |  |  | $ (94) |  |

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