Earnings Per Share - Schedule of Earnings Per Share. Basic and Dilutive (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Numerator:
(Loss) income from continuing operations	$ 10,615	$ (100,832)	$ 13,419	$ (93,510)
Loss from discontinued operations, net of tax	(1)	(30)	(59)	(41)
Net income (loss)	$ 10,614	$ (100,862)	$ 13,360	$ (93,551)
Denominator:
Basic weighted-average shares (in shares)	29,868	30,714	29,808	31,263
Dilutive effect of restricted stock awards (in shares)	97	0	250	0
Dilutive effect of stock options (in shares)	10	0	20	0
Dilutive weighted-average shares (in shares)	29,975	30,714	30,078	31,263
Basic income (loss) per share:
Continuing Operations (in dollars per share)	$ 0.36	$ (3.28)	$ 0.45	$ (2.99)
Discontinued operations (in dollars per share)	0.00	0.00	0.00	0.00
Total (in dollars per share)	0.36	(3.28)	0.45	(2.99)
Diluted income (loss) per share:
Continuing operations (in dollars per share)	0.35	(3.28)	0.45	(2.99)
Discontinued operations (in dollars per share)	0.00	0.00	0.00	0.00
Total (in dollars per share)	$ 0.35	$ (3.28)	$ 0.45	$ (2.99)