Concentration of Credit Risk - (Tables)

12 Months Ended

Sep. 30, 2018

Risks and Uncertainties [Abstract]

Schedule of Revenue from External Customers by Geographic Areas

The following tables set forth external net revenue, net of intercompany eliminations, and net asset information by region:

	Year Ended September 30,
	2018		2017		2016
Sales to external customers
United States	$	1,067,636	$	1,033,404	$	950,229
Rest of World	271,905		214,020		186,967
Total	$	1,339,541	$	1,247,424	$	1,137,196

Schedule of Long-lived Assets by Geographic Areas

	September 30, 2018		September 30, 2017
Net Assets
United States	$	332,624	$	187,247
Rest of World	29,392		29,328
	362,016		216,575
Long Lived Assets
United States	286,193		240,528
Rest of World	33,830		39,515
	$	320,023	$	280,043

Schedule of Net Assets by Geographic Areas

	September 30, 2018		September 30, 2017
Net Assets
United States	$	332,624	$	187,247
Rest of World	29,392		29,328
	362,016		216,575
Long Lived Assets
United States	286,193		240,528
Rest of World	33,830		39,515
	$	320,023	$	280,043