Other Intangible Assets (Tables)

12 Months Ended

Sep. 30, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Finite-Lived Intangible Assets

Intangible assets consist of the following:

		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

		September 30, 2018
	Estimated Life (years)	Carrying Amount		Accumulated Amortization			Net
Amortizing intangible assets
Customer related	5 ‑ 26	$	292,115	$	(47,348	)	$	244,767
Proprietary technology	10	49,315		(19,685		)	29,630
Trademark	10-15	26,535		(3,563		)	22,972
Backlog	1	82,315		(81,764		)	551
Other	4	17,175		(8,894		)	8,281
Total amortizing intangible assets		467,455		(161,254		)	306,201
Indefinite‑lived intangible assets		34,207		—			34,207
Total intangible assets		$	501,662	$	(161,254	)	$	340,408

Schedule of Finite-lived Intangible Assets Amortization Expense

For the amortizing intangible assets, the remaining weighted-average amortization period at September 30, 2019 was as follows:

	Years
Customer-related intangibles	11
Proprietary technology	5
Trademarks	7
Other	2
Aggregate net intangible assets	8

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense

The estimated future amortization expense is as follows:

2020	$	29,403
2021	27,682
2022	27,473
2023	26,076
2024	22,591
Thereafter	147,335
Total	$	280,560