Other Intangible Assets (Tables)

12 Months Ended

Sep. 30, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Finite-Lived Intangible Assets

Intangible assets consist of the following:

		September 30, 2020
	Estimated Life (years)	Carrying Amount		Accumulated Amortization			Net
Amortizing intangible assets
Customer related	5 ‑ 26	$	292,316	$	(83,486	)	$	208,830
Proprietary technology	7 - 10	61,990		(30,886		)	$	31,104
Trademark	5 - 15	27,114		(9,142		)	$	17,972
Backlog	1	82,181		(82,181		)	$	—
Other	3	39,010		(21,156		)	$	17,854
Total amortizing intangible assets		$	502,611	$	(226,851	)	$	275,760
Indefinite‑lived intangible assets		34,207		—			$	34,207
Total intangible assets		$	536,818	$	(226,851	)	$	309,967

		September 30, 2019
	Estimated Life (years)	Carrying Amount		Accumulated Amortization			Net
Amortizing intangible assets
Customer related	5 ‑ 26	$	290,407	$	(64,548	)	$	225,859
Proprietary technology	10	50,725		(24,187		)	$	26,538
Trademark	10 - 15	26,432		(6,245		)	$	20,187
Backlog	1	81,834		(81,834		)	$	—
Other	3	22,868		(14,892		)	$	7,976
Total amortizing intangible assets		$	472,266	$	(191,706	)	$	280,560
Indefinite‑lived intangible assets		34,207		—			$	34,207
Total intangible assets		$	506,473	$	(191,706	)	$	314,767

Schedule of Finite-lived Intangible Assets Amortization Expense

For the amortizing intangible assets, the remaining weighted-average amortization period at September 30, 2020 was as follows:

	Years
Customer-related intangibles	10
Proprietary technology	5
Trademarks	7
Other	3
Aggregate net intangible assets	7

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense

The estimated future amortization expense is as follows:

2021	$	34,469
2022	34,241
2023	30,728
2024	24,505
2025	19,940
Thereafter	131,877
Total	$	275,760