Restructuring (Narrative) (Details) $ in Thousands		1 Months Ended	3 Months Ended		6 Months Ended
	Nov. 17, 2015 position	Dec. 31, 2015 USD ($) position	Mar. 31, 2016 USD ($) position	Mar. 31, 2015 USD ($)	Jun. 30, 2015 position
Restructuring Cost and Reserve [Line Items]
Restructuring			$ 46,065	$ 33,951
Restructuring Reserve		$ 40,396	46,436
Employee Severance and Related Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring			36,452
Consolidation of Leased Facilities [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring			$ 9,692
2015 Other Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Number of full-time positions eliminated | position	700	350	350
Restructuring			$ 39,091
Restructuring costs incurred since inception			68,800
Restructuring Reserve		$ 16,581	18,971
2015 Other Restructuring Program [Member] | Employee Severance and Related Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring			36,379
2015 Other Restructuring Program [Member] | Consolidation of Leased Facilities [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring			$ 2,712
2014 Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Number of full-time positions eliminated | position			325
Restructuring costs incurred since inception			$ 22,200
Restructuring Reserve		1,121	1,121
2014 Restructuring Program [Member] | Employee Severance and Related Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring			0
2014 Restructuring Program [Member] | Consolidation of Leased Facilities [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring			0
2015 Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Number of full-time positions eliminated | position					700
Restructuring			6,974
Restructuring costs incurred since inception			75,875
Restructuring Reserve		$ 22,694	26,344
2015 Restructuring Program [Member] | Employee Severance and Related Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring			73
2015 Restructuring Program [Member] | Consolidation of Leased Facilities [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring			6,980
Enterprise and Service Provider Division [Member] | 2015 Other Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring			38,503	0
Enterprise and Service Provider Division [Member] | 2014 Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring			0	834
Enterprise and Service Provider Division [Member] | 2015 Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring			$ 7,053	$ 32,755