Income Taxes - Schedule of Income Tax Benefit Differs from Amount Computed at Federal Statutory Corporate Tax Rate (Parenthetical) (Details) $ in Thousands	12 Months Ended
	Sep. 30, 2018 USD ($)
Income Tax Disclosure [Abstract]
Decrease in tax provision due to refund claims related to domestic production activities deduction	$ (1,741)	[1]
Decrease in tax provision due to revaluation of net deferred tax liability	$ (43,429)	[2]

[1] In 2018, the Company calculated refund claims related to the domestic production activities deduction. The refund claims reduced the tax provision by $1,741.

[2] In 2018, the inclusion of the revaluation of the net deferred tax liability attributable to the 2017 Tax Act reduced the tax provision by $43,429.