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Revenues - Disaggregation of Revenues (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
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
Disaggregation of revenues |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 236,658 | $ 199,766 | $ 193,949 | $ 182,597 | $ 231,086 | $ 192,223 | $ 174,778 | $ 173,495 | $ 812,970 | $ 771,582 | $ 685,740
Point in time |  |  |  |  |  |  |  |  |  |  |
Disaggregation of revenues |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 365,137 |  |
Over time |  |  |  |  |  |  |  |  |  |  |
Disaggregation of revenues |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 447,833 |  |
United States |  |  |  |  |  |  |  |  |  |  |
Disaggregation of revenues |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 582,972 | 536,700 | 503,100
International |  |  |  |  |  |  |  |  |  |  |
Disaggregation of revenues |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 229,998 |  |
Commercial |  |  |  |  |  |  |  |  |  |  |
Disaggregation of revenues |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 642,822 |  |
Government |  |  |  |  |  |  |  |  |  |  |
Disaggregation of revenues |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 170,148 |  |
Filtration |  |  |  |  |  |  |  |  |  |  |
Disaggregation of revenues |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 325,735 | 286,800 | 279,500
Filtration | Point in time |  |  |  |  |  |  |  |  |  |  |
Disaggregation of revenues |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 164,224 |  |
Filtration | Over time |  |  |  |  |  |  |  |  |  |  |
Disaggregation of revenues |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 161,511 |  |
Filtration | United States |  |  |  |  |  |  |  |  |  |  |
Disaggregation of revenues |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 274,446 |  |
Filtration | International |  |  |  |  |  |  |  |  |  |  |
Disaggregation of revenues |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 51,289 |  |
Filtration | Commercial |  |  |  |  |  |  |  |  |  |  |
Disaggregation of revenues |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 180,356 |  |
Filtration | Government |  |  |  |  |  |  |  |  |  |  |
Disaggregation of revenues |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 145,379 |  |
USG |  |  |  |  |  |  |  |  |  |  |
Disaggregation of revenues |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 211,915 | 214,000 | 162,400
USG | Point in time |  |  |  |  |  |  |  |  |  |  |
Disaggregation of revenues |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 164,126 |  |
USG | Over time |  |  |  |  |  |  |  |  |  |  |
Disaggregation of revenues |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 47,789 |  |
USG | United States |  |  |  |  |  |  |  |  |  |  |
Disaggregation of revenues |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 150,381 |  |
USG | International |  |  |  |  |  |  |  |  |  |  |
Disaggregation of revenues |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 61,534 |  |
USG | Commercial |  |  |  |  |  |  |  |  |  |  |
Disaggregation of revenues |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 207,666 |  |
USG | Government |  |  |  |  |  |  |  |  |  |  |
Disaggregation of revenues |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 4,249 |  |
Test |  |  |  |  |  |  |  |  |  |  |
Disaggregation of revenues |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 188,394 | 182,900 | 160,900
Test | Point in time |  |  |  |  |  |  |  |  |  |  |
Disaggregation of revenues |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 36,787 |  |
Test | Over time |  |  |  |  |  |  |  |  |  |  |
Disaggregation of revenues |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 151,607 |  |
Test | United States |  |  |  |  |  |  |  |  |  |  |
Disaggregation of revenues |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 112,358 |  |
Test | International |  |  |  |  |  |  |  |  |  |  |
Disaggregation of revenues |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 76,036 |  |
Test | Commercial |  |  |  |  |  |  |  |  |  |  |
Disaggregation of revenues |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 168,201 |  |
Test | Government |  |  |  |  |  |  |  |  |  |  |
Disaggregation of revenues |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 20,193 |  |
Technical Packaging |  |  |  |  |  |  |  |  |  |  |
Disaggregation of revenues |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 86,926 | $ 87,900 | $ 82,900
Technical Packaging | Point in time |  |  |  |  |  |  |  |  |  |  |
Disaggregation of revenues |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 0 |  |
Technical Packaging | Over time |  |  |  |  |  |  |  |  |  |  |
Disaggregation of revenues |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 86,926 |  |
Technical Packaging | United States |  |  |  |  |  |  |  |  |  |  |
Disaggregation of revenues |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 45,787 |  |
Technical Packaging | International |  |  |  |  |  |  |  |  |  |  |
Disaggregation of revenues |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 41,139 |  |
Technical Packaging | Commercial |  |  |  |  |  |  |  |  |  |  |
Disaggregation of revenues |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 86,599 |  |
Technical Packaging | Government |  |  |  |  |  |  |  |  |  |  |
Disaggregation of revenues |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 327 |  |

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