Unaudited Consolidated Statements of Changes in Equity - USD ($) $ in Thousands	Total	Common Stock	Treasury Stock	Additional Paid‑in Capital	Retained Deficit	Retained Deficit Accounting Standards Update 2016-02 Cumulative Effect, Period of Adoption [Member]	Accumulated Other Comprehensive Loss	Non‑controlling Interest
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption					$ (1,401)
Common stock issued at the beginning of the period (shares) at Sep. 30, 2018		115,016,000
Stockholders' equity, balance at the beginning of the period at Sep. 30, 2018	$ 362,016	$ 1,145	$ (2,837)	$ 533,435	(163,871)		$ (9,017)	$ 3,161
Treasury stock, balance at the beginning of the period (in shares) at Sep. 30, 2018			1,087,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity based compensation expense	14,248			14,248
Issuance of common stock (in shares)		108,000
Issuance of common stock, cost		$ 0		341
Proceeds from issuance of common stock	341
Shares withheld related to net share settlement (including tax withholdings) (shares)		844,000	569,000
Shares withheld related to net share settlement (including tax withholdings)	(1,248)	$ 9		(1,257)
Dividends paid to non-controlling interest	(750)							(750)
Net income (loss)	(10,425)				(11,211)			786
Other comprehensive income (loss)	810
Common stock issued at the end of the period (shares) at Jun. 30, 2019		115,968,000
Stockholders' equity, balance at the end of the period at Jun. 30, 2019	363,591	$ 1,154	$ (2,837)	546,767	(176,483)		(8,207)	3,197
Treasury stock, balance at the end of the period (in shares) at Jun. 30, 2019			1,656,000
Common stock issued at the beginning of the period (shares) at Mar. 31, 2019		115,691,000
Stockholders' equity, balance at the beginning of the period at Mar. 31, 2019	355,377	$ 1,151	$ (2,837)	542,104	(180,618)		(7,615)	3,192
Treasury stock, balance at the beginning of the period (in shares) at Mar. 31, 2019			1,518,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity based compensation expense	4,978			4,978
Issuance of common stock (in shares)		46,000
Issuance of common stock, cost		$ 0		0
Proceeds from issuance of common stock	0
Shares withheld related to net share settlement (including tax withholdings) (shares)		231,000	138,000
Shares withheld related to net share settlement (including tax withholdings)	(312)	$ 3		(315)
Net income (loss)	4,290				4,135			155
Other comprehensive income (loss)	(592)
Common stock issued at the end of the period (shares) at Jun. 30, 2019		115,968,000
Stockholders' equity, balance at the end of the period at Jun. 30, 2019	$ 363,591	$ 1,154	$ (2,837)	546,767	(176,483)		(8,207)	3,197
Treasury stock, balance at the end of the period (in shares) at Jun. 30, 2019			1,656,000
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption						$ (1,337)
Common stock issued at the beginning of the period (shares) at Sep. 30, 2019	116,008,000	116,008,000
Stockholders' equity, balance at the beginning of the period at Sep. 30, 2019	$ 365,822	$ 1,154	$ (2,837)	552,422	(174,976)		(13,004)	3,063
Treasury stock, balance at the beginning of the period (in shares) at Sep. 30, 2019	1,664,000		1,664,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity based compensation expense	$ 8,504			8,504
Issuance of common stock (in shares)		150,000
Issuance of common stock, cost		$ 33		17,916
Proceeds from issuance of common stock	17,949
Shares withheld related to net share settlement (including tax withholdings) (shares)		3,234,000	531,000
Shares withheld related to net share settlement (including tax withholdings)	0	$ 0		0
Dividends paid to non-controlling interest	(1,850)							(1,850)
Net income (loss)	83,257				82,341			916
Other comprehensive income (loss)	$ (25,015)
Common stock issued at the end of the period (shares) at Jun. 30, 2020	119,392,000	119,392,000
Stockholders' equity, balance at the end of the period at Jun. 30, 2020	$ 447,330	$ 1,187	$ (2,837)	578,842	(93,972)		(38,019)	2,129
Treasury stock, balance at the end of the period (in shares) at Jun. 30, 2020	2,195,000		2,195,000
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption						$ 0
Common stock issued at the beginning of the period (shares) at Mar. 31, 2020		119,070,000
Stockholders' equity, balance at the beginning of the period at Mar. 31, 2020	$ 422,503	$ 1,185	$ (2,837)	573,745	(115,356)		(36,306)	2,072
Treasury stock, balance at the beginning of the period (in shares) at Mar. 31, 2020			2,194,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity based compensation expense	2,520			2,520
Issuance of common stock (in shares)		0
Issuance of common stock, cost		$ 2		2,577
Proceeds from issuance of common stock	2,579
Shares withheld related to net share settlement (including tax withholdings) (shares)		322,000	1,000
Shares withheld related to net share settlement (including tax withholdings)	0	$ 0		0
Dividends paid to non-controlling interest	(400)							(400)
Net income (loss)	21,841				21,384			457
Other comprehensive income (loss)	$ (1,713)
Common stock issued at the end of the period (shares) at Jun. 30, 2020	119,392,000	119,392,000
Stockholders' equity, balance at the end of the period at Jun. 30, 2020	$ 447,330	$ 1,187	$ (2,837)	$ 578,842	$ (93,972)		$ (38,019)	$ 2,129
Treasury stock, balance at the end of the period (in shares) at Jun. 30, 2020	2,195,000		2,195,000