Summary of Operations and Significant Accounting Policies - Summary of Effect of New Accounting Pronouncement (Details) - USD ($) $ in Thousands		12 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cash provided by (used in) operating activities		$ 173	$ (13,768)	$ 34,051
Effect of Exchange Rate Changes on Cash, Cash Equivalents and Restricted Cash		(1,552)	(1,372)	1,677
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash		(3,362)	(13,265)	47,213
Cash, Cash Equivalents and Restricted Cash, Beginning of Year	[1]	62,496	75,761	28,548
Cash, Cash Equivalents and Restricted Cash, End of Year	[1]	59,134	62,496	75,761
As reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cash provided by (used in) operating activities			6,790	11,789
Effect of Exchange Rate Changes on Cash, Cash Equivalents and Restricted Cash			(1,455)	192
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash			7,210	23,466
Cash, Cash Equivalents and Restricted Cash, Beginning of Year		$ 58,331	51,121	27,655
Cash, Cash Equivalents and Restricted Cash, End of Year			$ 58,331	$ 51,121

[1] Includes Cash, Cash Equivalents and Restricted Cash that are included in Held-For-Sale Assets on the Consolidated Balance Sheets.