Restatement of Condensed Consolidated Financial Statements (Details 5) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended		3 Months Ended	6 Months Ended
Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2013 Previously Reported	Mar. 31, 2013 Previously Reported	Sep. 30, 2013 Previously Reported	Mar. 31, 2013 Adjustments	Mar. 31, 2013 Adjustments
Operating Activities:
Net income	$ 16,120	$ 29,702	$ 24,549	$ 44,016	$ 27,210	$ 39,729		$ 2,492	$ 4,287
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	7,852	6,879	15,229	11,597	6,879	11,597
Share-based compensation expense	1,725	59	2,585	59	59	59
Changes in operating assets and liabilities, net of effects from acquisitions:
Changes in operating assets and liabilities net of effects from acquisitions:	(15,201)	(66,495)	(71,662)	(111,643)	(64,003)	(107,356)		(2,492)	(4,287)
NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES	10,496	(29,855)	(29,299)	(55,971)	(29,855)	(55,971)
Investing Activities:
Acquisition of businesses, net of cash acquired	(10,708)	(20,177)	(79,683)	(53,272)	(20,177)	(53,272)
Net additions of property, plant and equipment	(6,025)	(2,438)	(10,947)	(3,861)	(2,438)	(3,861)
NET CASH USED IN INVESTING ACTIVITIES	(12,678)	(22,615)	(86,575)	(57,133)	(22,615)	(57,133)
Financing Activities:
Proceeds from short-term borrowings	10,000	45,000	30,000	70,000	45,000	70,000
Principal payments on short-term borrowings		(45,000)		(45,000)	(45,000)	(45,000)
Proceeds from long-term borrowings		50,000		50,000	50,000	50,000
Principal payments on long-term debt	(144)	(4,133)	(284)	(8,273)	(4,133)	(8,273)
Dividends paid to shareholders	(3,215)	(3,208)	(3,215)	(3,208)	(3,208)	(3,208)
Change in restricted cash	457	(313)	397	(84)	(313)	(84)
NET CASH PROVIDED BY FINANCING ACTIVITIES	6,764	42,346	25,894	63,435	42,346	63,435
Effect of exchange rates on cash	(615)	(15,387)	11,431	(13,993)	(15,387)	(13,993)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	3,967	(25,511)	(78,549)	(63,662)	(25,511)	(63,662)
Cash and cash equivalents at the beginning of the period	121,376	174,116	203,892	212,267	174,116	212,267	203,892
CASH AND CASH EQUIVALENTS AT THE END OF THE PERIOD	$ 125,343	$ 148,605	$ 125,343	$ 148,605	$ 148,605	$ 148,605	$ 203,892

Name:	us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.