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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