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, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Numerator:
(Loss) income from continuing operations	$ (100,832)	$ 11,616	$ (93,510)	$ (118,959)
Loss from discontinued operations, net of tax	(30)	(58)	(41)	(430)
Net (loss) income	$ (100,862)	$ 11,558	$ (93,551)	$ (119,389)
Denominator:
Basic weighted-average shares (in shares)	30,714	32,140	31,263	32,097
Dilutive effect of restricted stock awards (in shares)	0	466	0	0
Dilutive effect of stock options (in shares)	0	115	0	0
Dilutive weighted-average shares (in shares)	30,714	32,721	31,263	32,097
Basic (loss) earnings per share:
Continuing Operations (in dollars per share)	$ (3.28)	$ 0.36	$ (2.99)	$ (3.71)
Discontinued Operations (in dollars per share)	0.00	0.00	0.00	(0.01)
Total (in dollars per share)	(3.28)	0.36	(2.99)	(3.72)
Diluted (loss) earnings per share:
Continuing operations (in dollars per share)	(3.28)	0.36	(2.99)	(3.71)
Discontinued operations (in dollars per share)	0.00	(0.01)	0.00	(0.01)
Total (in dollars per share)	$ (3.28)	$ 0.35	$ (2.99)	$ (3.72)