Earnings per Share - Tabular Disclosure (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Earnings Per Share [Abstract]
Income from continuing operations	$ 13,696	$ 921	$ 36,062	$ 4,359
Income (loss) from discontinued operations, net of tax		6,333	(182)	20,731
Net income	$ 13,696	$ 7,254	$ 35,880	$ 25,090
Weighted average common shares outstanding used in computing basic earnings per share (in shares)	73,759	72,188	73,473	71,903
Dilutive restricted stock units	101	282	293	410
Weighted average common shares outstanding used in computing diluted earnings per share (in shares)	73,860	72,470	73,766	72,313
Basic net income per share:
Income from continuing operations (in dollars per share)	$ 0.19	$ 0.01	$ 0.49	$ 0.06
Income (loss) from discontinued operations, net of tax (in dollars per share)		0.09	0.00	0.29
Basic net income per share (in dollars per share)	0.19	0.10	0.49	0.35
Diluted net income per share:
Income from continuing operations (in dollars per share)	0.19	0.01	0.49	0.06
Income (loss) from discontinued operations, net of tax (in dollars per share)		0.09	0.00	0.29
Diluted net income per share (in dollars per share)	0.19	0.10	0.49	0.35
Dividend declared per share (in dollars per share)	$ 0.10	$ 0.10	$ 0.30	$ 0.30