Income Taxes - Schedule of Difference Between US Federal Statutory Income Tax Rate and Effective Income Tax Rate (Details)	3 Months Ended	9 Months Ended
	Jun. 30, 2018	Jun. 30, 2018
Income Tax Disclosure [Abstract]
U.S. federal statutory income tax rate	24.50%	24.50%
State income taxes, net of federal tax benefit	2.90%	3.10%
Effect of foreign operations	1.00%	1.00%
Deferred tax revaluation, including adoption of income tax method changes	(3.50%)	(14.60%)
Deemed repatriation tax		4.60%
Other, net	0.20%	0.20%
Effective tax rate	25.10%	18.80%