Goodwill and Other Intangible Assets - Schedule of Other Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Mar. 31, 2020	Sep. 30, 2019
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangibles, Accumulated Amortization		$ (629,203)	$ (593,221)
Intangible Assets
Gross Carrying Amount		2,564,651	2,888,057
Net Carrying Amount		1,935,448	2,294,836
Trade names
Indefinite-lived intangibles
Indefinite-lived intangibles		685,198	685,324
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Life (in years)	14 years
Finite-lived intangibles, Gross Carrying Amount		1,670,249	1,931,212
Finite-lived intangibles, Accumulated Amortization		(520,094)	(489,471)
Finite-lived intangibles, Net Carrying Amount		1,150,155	1,441,741
Trade names and other
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Life (in years)	14 years
Finite-lived intangibles, Gross Carrying Amount		209,204	271,521
Finite-lived intangibles, Accumulated Amortization		(109,109)	(103,750)
Finite-lived intangibles, Net Carrying Amount		$ 100,095	$ 167,771