Segment Information (Revenue And Operating Income) (Details) - USD ($) $ in Thousands		12 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Revenue		$ 1,164,039	$ 1,140,533	$ 1,255,242
Cost of Revenue		329,019	325,665	334,734
Gross Profit		835,020	814,868	920,508
Unallocated Operating Expennses	[1]	689,413	666,028	723,780
Operating income		40,898	(37,014)	41,616
Other income (expense), net		42,304	30,178	15,091
Restructuring charges		7,942	76,273	43,409
Income before income taxes		(1,406)	(67,192)	26,525
Depreciation and amortization		86,742	86,554	84,433
Solutions Group [Member]
Revenue		893,606	871,225	980,274
Cost of Revenue		184,160	186,174	224,042
Gross Profit		709,446	685,051	756,232
Depreciation and amortization		5,400	5,400	5,600
Technology Platform Group [Member]
Revenue		93,710	72,371	49,249
Cost of Revenue		96,535	83,747	28,998
Gross Profit		(2,825)	(11,376)	20,251
Depreciation and amortization		1,500	1,600	1,000
Professional Services [Member]
Revenue		176,723	196,937	225,719
Cost of Revenue		145,091	165,325	193,397
Gross Profit		31,632	31,612	32,322
Depreciation and amortization		1,800	2,000	2,200
Total Segments [Member]
Revenue		1,164,039	1,140,533	1,255,242
Cost of Revenue		425,786	435,246	446,437
Gross Profit		738,253	705,287	808,805
Unallocated [Member]
Depreciation and amortization		$ 19,300	$ 19,700	$ 20,100

[1] The Solutions Group segment includes depreciation of $5.4 million, $5.4 million and $5.6 million in 2017, 2016 and 2015, respectively. The IoT Group segment includes depreciation of $1.5 million, $1.6 million and $1.0 million in 2017, 2016 and 2015, respectively. The Professional Services segment includes depreciation of $1.8 million, $2.0 million and $2.2 million in 2017, 2016 and 2015, respectively. Unallocated departments include depreciation of $19.3 million, $19.7 million and $20.1 million in 2017, 2016 and 2015, respectively.