Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Noncontrolling Interest
Beginning balance at Sep. 30, 2014	$ 812,346	$ 536	$ 332,264	$ 489,744	$ (10,198)	$ 0
Beginning balance (shares) at Sep. 30, 2014		53,585
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock compensation	(1,558)		(1,558)
Purchase of subsidiary shares from noncontrolling interest	(20,293)		(20,222)		(71)
Release of restricted stock	1	$ 1
Release of restricted stock (shares)		111
Excess tax deficiency from stock compensation	(236)		(236)
Taxes paid related to net share settlement of equity awards	(210)		(210)
Amounts reclassified from accumulated other comprehensive loss	428				428
Foreign currency translation adjustment	(45,255)				(45,255)
Net income (loss)	(89,192)			(89,192)
Ending balance at Sep. 30, 2015	656,031	$ 537	310,038	400,552	(55,096)	0
Ending balance (shares) at Sep. 30, 2015		53,696
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock compensation	9,152		9,152
Release of restricted stock	4	$ 4
Release of restricted stock (shares)		403
Excess tax deficiency from stock compensation	(295)		(295)
Taxes paid related to net share settlement of equity awards	(172)		(172)
Amounts reclassified from accumulated other comprehensive loss	21				21
Foreign currency translation adjustment	(14,187)				(14,187)
Foreign currency translation reclassification upon disposition of Grupo Finmart	25,173				25,173
Acquisition of noncontrolling interest	246					246
Net income (loss)	(81,768)			(80,744)		(1,024)
Ending balance at Sep. 30, 2016	594,205	$ 541	318,723	319,808	(44,089)	(778)
Ending balance (shares) at Sep. 30, 2016		54,099
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock compensation	5,831		5,831
Release of restricted stock	3	$ 3
Release of restricted stock (shares)		299
Taxes paid related to net share settlement of equity awards	(767)		(767)
Reclassification of 2019 Convertible Notes Warrants to liabilities	(523)		(523)
Foreign currency translation adjustment	5,701				5,722	(21)
Equity classified conversion feature of 2024 Convertible Notes, net of tax	25,268		25,268
Net income (loss)	30,208			31,858		(1,650)
Ending balance at Sep. 30, 2017	$ 659,926	$ 544	$ 348,532	$ 351,666	$ (38,367)	$ (2,449)
Ending balance (shares) at Sep. 30, 2017		54,398