Earnings per Share, Basic and diluted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Numerator:
Income (loss) from continuing operations	$ (23,125)	$ (21,193)	$ (106,152)	$ 19,879
Income (loss) from discontinued operations	1,326	(7)	472	(3,872)
NET INCOME (LOSS)	(21,799)	(21,200)	(105,680)	16,007
Adjustment for basic earnings per share:
Earnings allocated to unvested shareholders	(458)	(451)	(1,349)	(1,410)
Numerator for basic earnings per share:
From continuing operations	(23,583)	(21,644)	(107,501)	18,469
From discontinued operations	1,326	(7)	472	(3,872)
Net income (loss) attributable to parent, basic	(22,257)	(21,651)	(107,029)	14,597
Numerator for diluted earnings per share:
From continuing operations	(23,583)	(21,644)	(107,501)	18,469
From discontinued operations	1,326	(7)	472	(3,872)
Net income (loss) attributable to parent, diluted	$ (22,257)	$ (21,651)	$ (107,029)	$ 14,597
Denominator:
Denominator for basic earnings per share – weighted-average shares	108,572	108,047	108,470	107,970
Effect of dilutive shares from stock options and restricted stock (in shares)				553
Denominator for diluted earnings per share – adjusted weighted-average shares	108,572	108,047	108,470	108,523
Basic earnings per common share:
Income (loss) from continuing operations (in dollars per share)	$ (0.22)	$ (0.20)	$ (0.99)	$ 0.18
Income (loss) from discontinued operations (in dollars per share)	0.01			(0.04)
Net income (loss) (in dollars per share)	(0.21)	(0.20)	(0.99)	0.14
Diluted earnings per common share:
Income (loss) from continuing operations (in dollars per share)	(0.22)	(0.20)	(0.99)	0.17
Income (loss) from discontinued operations (in dollars per share)	0.01			(0.04)
Net income (loss) (in dollars per share)	$ (0.21)	$ (0.20)	$ (0.99)	$ 0.13
Outstanding equity awards
Shares excluded from calculation of diluted earnings per share (in shares)	1,332	3,409	1,034	1,861
Weighted-average price per share (in dollars per share)	$ 70.82	$ 51.94	$ 73.84	$ 63.70