Other Intangible Assets (Tables)

12 Months Ended

Sep. 30, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Finite-Lived Intangible Assets

Intangible assets consist of the following:

		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

		September 30, 2017
	Estimated Life (years)	Carrying Amount		Accumulated Amortization			Net
Amortizing intangible assets
Customer related	5 ‑ 26	$	265,095	$	(31,265	)	$	233,830
Proprietary technology	10	45,175		(11,390		)	33,785
Trademark	10-15	26,149		(4,293		)	21,856
Backlog	1	82,277		(80,947		)	1,330
Other	4	13,953		(5,215		)	8,738
Total amortizing intangible assets		432,649		(133,110		)	299,539
Indefinite‑lived intangible assets		34,207		—			34,207
Total intangible assets		$	466,856	$	(133,110	)	$	333,746

Schedule of Indefinite-Lived Intangible Assets

Intangible assets consist of the following:

		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

		September 30, 2017
	Estimated Life (years)	Carrying Amount		Accumulated Amortization			Net
Amortizing intangible assets
Customer related	5 ‑ 26	$	265,095	$	(31,265	)	$	233,830
Proprietary technology	10	45,175		(11,390		)	33,785
Trademark	10-15	26,149		(4,293		)	21,856
Backlog	1	82,277		(80,947		)	1,330
Other	4	13,953		(5,215		)	8,738
Total amortizing intangible assets		432,649		(133,110		)	299,539
Indefinite‑lived intangible assets		34,207		—			34,207
Total intangible assets		$	466,856	$	(133,110	)	$	333,746

Schedule of Finite-lived Intangible Assets Amortization Expense

For the amortizing intangible assets, the remaining weighted-average amortization period at September 30, 2018 was as follows:

	Years
Customer-related intangibles	13
Proprietary technology	6
Trademarks	9
Other	1
Aggregate net intangible assets	9

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense

The estimated future amortization expense is as follows:

2019	$	31,487
2020	28,045
2021	26,518
2022	25,983
2023	25,501
Thereafter	168,667
Total	$	306,201