Earnings Per Share - Schedule of Earnings Per Share, Basic and Dilutive (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share [Abstract]
(Loss) income from continuing operations	$ 2,464	$ 11,625	$ (100,832)	$ 7,322	$ 60,484	$ 13,429	$ 11,616	$ (130,575)	$ (79,421)	$ (45,046)	$ 31,953
Loss from discontinued operations, net of tax									(99)	(329)	(140)
Net (loss) income									$ (79,520)	$ (45,375)	$ 31,813
Basic weighted-average shares (in shares)									30,617	32,141	31,952
Dilutive effect of restricted stock awards (in shares)									0	0	433
Dilutive effect of stock options (in shares)									0	0	41
Diluted weighted-average shares (in shares)									30,617	32,141	32,426
Basic (loss) income per share:
Continuing operations (in dollars per share)	$ 0.08	$ 0.38	$ (3.28)	$ 0.23	$ 1.88	$ 0.42	$ 0.36	$ (4.07)	$ (2.59)	$ (1.40)	$ 1.00
Discontinued operations (in dollars per share)									(0.01)	(0.01)	0.00
Total (in dollars per share)									(2.60)	(1.41)	1.00
Diluted (loss) income per share:
Continuing operations (in dollars per share)	$ 0.08	$ 0.38	$ (3.28)	$ 0.23	$ 1.83	$ 0.41	$ 0.36	$ (4.07)	(2.59)	(1.40)	0.99
Discontinued operations (in dollars per share)									(0.01)	(0.01)	0.00
Total (in dollars per share)									$ (2.60)	$ (1.41)	$ 0.99