Income Taxes - Reconciliation of Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Provision for income taxes attributable to continuing operations
Income tax expense at the federal statutory rate	$ 14,000	$ 15,134	$ 128
State taxes, net of federal benefit	1,265	(714)	2,476
Mexico inflation adjustment	(936)	(1,286)	(142)
Non-deductible items	2,214	1,114	1,860
Tax credits	(615)	(321)	2,788
Foreign rate differential	1,405	(172)	277
Change in net operating loss carryforward	0	1,180	0
Change in valuation allowance	3,986	(3,211)	1,511
Stock compensation	0	(386)	0
Uncertain tax positions	(4,808)	674	0
Change in tax rate resulting from enactment of the Act	2,060	0	0
Other	(422)	(806)	463
Total income tax expense	$ 18,149	$ 11,206	$ 9,361
Effective tax rate	32.00%	26.00%	2579.00%

Effective Income Tax Rate Reconciliation, Foreign Inflation Adjustment, Amount

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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