Other (Income) Expense, Net (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016
Other (Income) Expense, Net
Equity interest in earnings of the JV (Note 4)	$ (382)	$ (2,158)	$ (1,066)	$ (2,158)
Net (gain) loss on sales of assets	37	1	(3,662)	(1,601)
Rent income	(70)	(83)	(143)	(184)
Net (gain) loss on investments in deferred compensation program	(705)	(130)	(729)	(434)
Other	(195)	(57)	(303)	(59)
Other (income) expense, net	$ (1,315)	$ (2,427)	$ (5,903)	$ (4,436)