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Summary of Significant Accounting Policies - Additional Information (Details) | 3 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2019 USD ($) | Sep. 30, 2019 USD ($) segment | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Oct. 01, 2018 USD ($) | Mar. 14, 2018 USD ($) | Aug. 30, 2017 USD ($) | May 25, 2017 USD ($) | May 08, 2017 USD ($) | Nov. 07, 2016 USD ($)
Number of reportable segments | segment |  | 4 |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | $ (43,974,000) | $ (43,974,000) | $ (31,528,000) |  |  |  |  |  |  |
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax | (37,000,000.0) | (37,000,000.0) | (30,900,000) |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax | (7,000,000.0) | (7,000,000.0) | (500,000) |  |  |  |  |  |  |
Research and Development Expense |  | 14,500,000 | 13,100,000 | $ 14,000,000.0 |  |  |  |  |  |
Retained earnings | 684,741,000 | 684,741,000 | 606,837,000 |  |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  | 6,300,000 | (6,261,000) |  |  |  |  |  |  |
Asset Impairment Charges | 0 | $ 0 |  |  |  |  |  |  |  |
Warranty period |  | 12 months |  |  |  |  |  |  |  |
Goodwill | 409,215,000 | $ 409,215,000 | 381,652,000 | 377,900,000 |  | $ 3,500,000 | $ 10,700,000 | $ 4,800,000 | $ 7,500,000 | $ 30,100,000
NRG led management [Member] |  |  |  |  |  |  |  |  |  |
Goodwill | 8,000,000 | 8,000,000 |  |  |  |  |  |  |  |
Tradename | 8,000,000 | 8,000,000 |  |  |  |  |  |  |  |
Maintenance [Member] |  |  |  |  |  |  |  |  |  |
Cost of Goods and Services Sold |  | 15,800,000 | 13,100,000 | $ 10,400,000 |  |  |  |  |  |
ASU 2014-09 |  |  |  |  |  |  |  |  |  |
Retained earnings |  |  |  |  | $ 5,200,000 |  |  |  |  |
ASU 2016-02 |  |  |  |  |  |  |  |  |  |
Right-of-use assets | 25,000,000 | 25,000,000 |  |  |  |  |  |  |  |
Lease liabilities | $ 25,000,000 | $ 25,000,000 |  |  |  |  |  |  |  |
Foreign Exchange Forward [Member] |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax |  |  | $ (100,000) |  |  |  |  |  |  |
Maximum | Building [Member] |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  | 40 years |  |  |  |  |  |  |  |
Maximum | Machinery and Equipment [Member] |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  | 10 years |  |  |  |  |  |  |  |
Maximum | Office Furniture And Equipment [Member] |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  | 10 years |  |  |  |  |  |  |  |
Minimum | Building [Member] |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  | 10 years |  |  |  |  |  |  |  |
Minimum | Machinery and Equipment [Member] |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  | 3 years |  |  |  |  |  |  |  |
Minimum | Office Furniture And Equipment [Member] |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  | 3 years |  |  |  |  |  |  |  |
USG |  |  |  |  |  |  |  |  |  |
Percentage of segment revenues recognized when services are performed or when products are delivered |  | 75.00% |  |  |  |  |  |  |  |
Percentage of consolidated revenues recognized when services are performed or when products are delivered |  | 19.00% |  |  |  |  |  |  |  |
Revenue recognized when products were delivered or services performed under ASC 605 (as a percent) |  |  | 75.00% | 78.00% |  |  |  |  |  |
Revenue recognized using percentage of completion method under ASC 605 (as a percent) |  |  | 25.00% | 22.00% |  |  |  |  |  |
Percentage Of Segment Revenues Recognized On Straight Line Basis |  | 25.00% |  |  |  |  |  |  |  |
Percentage Of Consolidated Revenues Recognized On Straight Line Basis |  | 7.00% |  |  |  |  |  |  |  |
Filtration |  |  |  |  |  |  |  |  |  |
Percentage of segment revenues recognized when services are performed or when products are delivered |  | 50.00% |  |  |  |  |  |  |  |
Percentage of consolidated revenues recognized when services are performed or when products are delivered |  | 20.00% |  |  |  |  |  |  |  |
Revenue recognized when products were delivered or services performed under ASC 605 (as a percent) |  |  | 85.00% | 86.00% |  |  |  |  |  |
Revenue recognized using percentage of completion method under ASC 605 (as a percent) |  |  | 15.00% | 14.00% |  |  |  |  |  |
Percentage Of Segment Revenues Recognized Over Time, Costs Incurred Plus Margin | 50.00% | 50.00% |  |  |  |  |  |  |  |
Percentage Of Consolidated Revenues Recognized Over Time, Costs Incurred Plus Margin | 20.00% | 20.00% |  |  |  |  |  |  |  |
Test |  |  |  |  |  |  |  |  |  |
Percentage of segment revenues recognized when services are performed or when products are delivered |  | 20.00% |  |  |  |  |  |  |  |
Percentage of consolidated revenues recognized when services are performed or when products are delivered |  | 4.00% |  |  |  |  |  |  |  |
Percentage of segment revenues recorded under percentage of completion method |  | 80.00% |  |  |  |  |  |  |  |
Percentage of consolidated revenues recorded under percentage of completion method |  | 19.00% |  |  |  |  |  |  |  |
Revenue recognized when products were delivered or services performed under ASC 605 (as a percent) |  |  | 25.00% | 30.00% |  |  |  |  |  |
Revenue recognized using percentage of completion method under ASC 605 (as a percent) |  |  | 75.00% | 70.00% |  |  |  |  |  |
Technical Packaging |  |  |  |  |  |  |  |  |  |
Percentage of segment revenues recognized when services are performed or when products are delivered |  | 100.00% |  |  |  |  |  |  |  |
Percentage of consolidated revenues recognized when services are performed or when products are delivered |  | 11.00% |  |  |  |  |  |  |  |
Revenue recognized when products were delivered or services performed under ASC 605 (as a percent) |  |  | 100.00% | 100.00% |  |  |  |  |  |
Goodwill | $ 18,900,000 | $ 18,900,000 | $ 19,800,000 | $ 19,900,000 |  |  |  |  |  |
Software Contract |  |  |  |  |  |  |  |  |  |
Percentage of segment revenues recognized when services are performed or when products are delivered |  | 10.00% |  |  |  |  |  |  |  |
Percentage of consolidated revenues recognized when services are performed or when products are delivered |  | 2.00% |  |  |  |  |  |  |  |
Software Development | Maximum |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  | 7 years |  |  |  |  |  |  |  |
Software Development | Minimum |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  | 3 years |  |  |  |  |  |  |  |

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