CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016
Operating Activities:
Net income (loss)	$ 461	$ 10,144	$ (2,407)	$ 4,730
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	12,292	10,029	25,736	18,977
Share-based compensation expense	1,043	1,970	3,357	4,088
Change in fair value of contingent consideration	(880)	(897)	(2,194)	(1,706)
Changes in operating assets and liabilities net of effects from acquisitions	(9,016)	(9,354)	(13,494)	(63,784)
NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES	3,900	11,892	10,998	(37,695)
Investing Activities:
Acquisition of businesses, net of cash acquired		(213,765)	(12,924)	(243,483)
Purchases of property, plant and equipment	(8,495)	(11,015)	(15,169)	(21,375)
Purchases of marketable securities	(12,509)	(7,145)	(18,755)	(14,686)
Proceeds from sales or maturities of marketable securities	6,257	15,694	12,503	29,870
Proceeds from sale of fixed assets			1,233
NET CASH USED IN INVESTING ACTIVITIES	(14,747)	(216,231)	(33,112)	(249,674)
Financing Activities:
Proceeds from short-term borrowings	32,480	180,700	69,280	253,300
Principal payments on short-term borrowings	(24,280)	(50,700)	(59,280)	(73,300)
Proceeds from long-term borrowings		75,000		75,000
Principal payments on long-term debt	(109)	(123)	(216)	(254)
Purchase of common stock			(2,314)	(1,658)
Dividends paid	(3,659)	(3,641)	(3,679)	(3,641)
Contingent consideration payments related to acquisitions of businesses			(1,988)	(1,679)
Net change in restricted cash	2,713	(1,102)	(1,513)	(3,514)
NET CASH PROVIDED BY FINANCING ACTIVITIES	7,145	200,134	290	244,254
Effect of exchange rates on cash	5,180	(8,350)	(7,486)	(16,553)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	1,478	(12,555)	(29,310)	(59,668)
Cash and cash equivalents at the beginning of the period	166,339	171,363	197,127	218,476
CASH AND CASH EQUIVALENTS AT THE END OF THE PERIOD	167,817	158,808	167,817	158,808
Vocality
Operating Activities:
Net income (loss)	(600)		(1,500)
Supplemental disclosure of non-cash investing and financing activities:
Liability incurred to acquire, net			1,035
GATR
Operating Activities:
Net income (loss)	(2,900)	(18,300)	(3,200)	(18,300)
Supplemental disclosure of non-cash investing and financing activities:
Liability incurred to acquire, net		7,651		7,651
TeraLogics
Operating Activities:
Net income (loss)	$ (100)	$ (200)	(100)	(1,200)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Change in fair value of contingent consideration			3,200
Supplemental disclosure of non-cash investing and financing activities:
Liability incurred to acquire, net				4,998
H4 Global
Operating Activities:
Net income (loss)			$ (200)
Supplemental disclosure of non-cash investing and financing activities:
Liability incurred to acquire, net				$ 952