Basis Of Presentation And Consolidation (Consolidated Statement Of Cash Flows) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities:
Net (loss) income	$ 8,206	$ 8,505	[1],[2]
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	6,092	7,487	[1],[2]
Gain on investments	(189)	(338)	[1],[2]
Equity in income of joint ventures	(1,376)	(1,816)	[1],[2]
Dividends from joint ventures	1,144	1,340	[1],[2]
Stock-based compensation and related net tax benefits	873	453	[1],[2]
Current and long-term deferred taxes, net	(1,792)	847	[1],[2]
Changes in operating assets and liabilities:
Decrease in accounts receivable, net	2,923	3,205	[1],[2]
(Increase) decrease in prepaid taxes	(385)	1,027	[1],[2]
Decrease in other operating assets, net	347	761	[1],[2]
Decrease in accounts payable and other accrued liabilities	(1,002)	(2,021)	[1],[2]
(Decrease) increase in other operating liabilities, net	(108)	430	[1],[2]
Net cash provided by operating activities	14,857	19,880	[1],[2]
Cash flows used by investing activities:
Acquisition of property, plant and equipment	(3,063)	(2,415)	[1],[2]
Acquisition of joint ventures and businesses, net of cash acquired		(1,800)	[1],[2]
Other investing activities, net	147	(114)	[1],[2]
Net cash used by investing activities	(2,916)	(4,329)	[1],[2]
Cash flows (used) provided by financing activities:
Net borrowings on revolving credit facility		(43)	[1],[2]
Long-term borrowings - loan	16,300	20,000	[1],[2]
Long-term borrowings - repayment	(15,300)	(24,500)	[1],[2]
Dividends paid to stockholders	(10,599)	(10,520)	[1],[2]
Other financing activities, net	(321)	(347)	[1],[2]
Net cash used by financing activities	(9,920)	(15,410)	[1],[2]
Effects of foreign currency translation	(358)	109	[1],[2]
Net increase in cash and cash equivalents	1,663	250	[1],[2]
Opening balance - cash and cash equivalents	6,761	8,672	[1],[2]
Ending balance - cash and cash equivalents	8,424	8,922	[1],[2]
As Previously Reported [Member]
Cash flows from operating activities:
Net (loss) income		8,210	[1]
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization		7,662	[1]
Gain on investments		(203)	[1]
Equity in income of joint ventures		(1,108)	[1]
Dividends from joint ventures		1,340	[1]
Stock-based compensation and related net tax benefits		453	[1]
Current and long-term deferred taxes, net		791	[1]
Changes in operating assets and liabilities:
Decrease in accounts receivable, net		3,119	[1]
(Increase) decrease in prepaid taxes		721	[1]
Decrease in other operating assets, net		571	[1]
Decrease in accounts payable and other accrued liabilities		(2,025)	[1]
(Decrease) increase in other operating liabilities, net		430	[1]
Net cash provided by operating activities		19,961	[1]
Cash flows used by investing activities:
Acquisition of property, plant and equipment		(2,415)	[1]
Acquisition of joint ventures and businesses, net of cash acquired		(1,800)	[1]
Other investing activities, net		(637)	[1]
Net cash used by investing activities		(4,852)	[1]
Cash flows (used) provided by financing activities:
Net borrowings on revolving credit facility		(43)	[1]
Long-term borrowings - loan		20,000	[1]
Long-term borrowings - repayment		(24,500)	[1]
Dividends paid to stockholders		(10,520)	[1]
Other financing activities, net		(347)	[1]
Net cash used by financing activities		(15,410)	[1]
Effects of foreign currency translation		108	[1]
Net increase in cash and cash equivalents		(193)	[1]
Opening balance - cash and cash equivalents		11,184	[1]
Ending balance - cash and cash equivalents		$ 10,991	[1]

[1] As reported in the Company's 2014 third fiscal quarter Form 10-Q (filed on August 11, 2014), certain errors were identified in the Consolidated Statement of Cash Flows that impacted prior periods.  The errors related to the following:   treatment of accrued additions for property, plant and equipment, classification of debt financing fees and classification of unrealized gains or losses on investments in the Consolidated Statements of Cash Flows.   The prior period consolidated statements of cash flows were revised in the 2014 third fiscal quarter Form 10-Q to correct for these errors and the impacts of the corrections are reflected within the 'Previously Reported' columns above.

[2] As Restated