Restructuring Restructuring reserves and related costs (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			6 Months Ended		3 Months Ended			3 Months Ended			3 Months Ended			3 Months Ended			6 Months Ended										3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended				3 Months Ended		6 Months Ended														3 Months Ended			6 Months Ended
	Sep. 30, 2012		Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012 Severance and termination benefits		Mar. 31, 2012 Severance and termination benefits	Sep. 30, 2012 Impairment in Value of Asset [Member]		Mar. 31, 2012 Impairment in Value of Asset [Member]	Sep. 30, 2012 Lease termination obligations		Mar. 31, 2012 Lease termination obligations	Sep. 30, 2012 Other Restructuring Costs [Member]		Mar. 31, 2012 Other Restructuring Costs [Member]	Sep. 30, 2012 Operating Expense [Member]	Sep. 30, 2011 Operating Expense [Member]	Sep. 30, 2012 Operating Expense [Member] Severance and termination benefits	Sep. 30, 2011 Operating Expense [Member] Severance and termination benefits	Sep. 30, 2012 Operating Expense [Member] Product [Member]	Sep. 30, 2011 Operating Expense [Member] Product [Member]	Sep. 30, 2012 Operating Expense [Member] Impairment in Value of Asset [Member]	Sep. 30, 2011 Operating Expense [Member] Impairment in Value of Asset [Member]	Sep. 30, 2012 Operating Expense [Member] Lease termination obligations	Sep. 30, 2011 Operating Expense [Member] Lease termination obligations	Sep. 30, 2012 Operating Expense [Member] 2010 Plan	Sep. 30, 2011 Operating Expense [Member] 2010 Plan	Sep. 30, 2012 Operating Expense [Member] 2010 Plan	Sep. 30, 2011 Operating Expense [Member] 2010 Plan	Sep. 30, 2012 Operating Expense [Member] 2010 Plan Severance and termination benefits	Sep. 30, 2011 Operating Expense [Member] 2010 Plan Severance and termination benefits	Sep. 30, 2012 Operating Expense [Member] 2010 Plan Severance and termination benefits	Sep. 30, 2011 Operating Expense [Member] 2010 Plan Severance and termination benefits	Sep. 30, 2012 Operating Expense [Member] 2010 Plan Product [Member]	Sep. 30, 2011 Operating Expense [Member] 2010 Plan Product [Member]	Sep. 30, 2012 Operating Expense [Member] 2010 Plan Impairment in Value of Asset [Member]	Sep. 30, 2011 Operating Expense [Member] 2010 Plan Impairment in Value of Asset [Member]	Sep. 30, 2012 Operating Expense [Member] 2010 Plan Impairment in Value of Asset [Member]	Sep. 30, 2011 Operating Expense [Member] 2010 Plan Impairment in Value of Asset [Member]	Sep. 30, 2012 Operating Expense [Member] 2010 Plan Lease termination obligations	Sep. 30, 2011 Operating Expense [Member] 2010 Plan Lease termination obligations	Sep. 30, 2012 Operating Expense [Member] 2008 Plan	Sep. 30, 2011 Operating Expense [Member] 2008 Plan	Sep. 30, 2012 Operating Expense [Member] 2008 Plan Severance and termination benefits	Sep. 30, 2011 Operating Expense [Member] 2008 Plan Severance and termination benefits	Sep. 30, 2012 Operating Expense [Member] 2008 Plan Product [Member]	Sep. 30, 2011 Operating Expense [Member] 2008 Plan Product [Member]	Sep. 30, 2012 Operating Expense [Member] 2008 Plan Impairment in Value of Asset [Member]	Sep. 30, 2011 Operating Expense [Member] 2008 Plan Impairment in Value of Asset [Member]	Sep. 30, 2012 Operating Expense [Member] 2008 Plan Lease termination obligations	Sep. 30, 2011 Operating Expense [Member] 2008 Plan Lease termination obligations	Sep. 30, 2012 Restructuring expenses	Sep. 30, 2012 Cost of revenues	Sep. 30, 2012 Cost of revenues 2010 Plan	Sep. 30, 2012 Cost of revenues 2010 Plan
Restructuring Cost and Reserve [Line Items]
Defined Benefit Plan, Effect of Settlements and Curtailments on Accumulated Benefit Obligation	$ 125			$ 125
Restructuring and Related Cost, Cost Incurred to Date	8,557																																																					7,451	1,106
Restructuring expenses	(48)		99	(184)	357													(184)	286	(167)	(80)	0	335	(17)	183	0	(152)	(48)	66	(184)	438	(48)	(26)	(167)	(80)	0	335	0	92	(17)	183	0	0	0	(152)	0	0	0	0	0	0	0	(152)			(33)	(71)
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning of Period				1,682				659			0			947			76
Restructuring Reserve, Provision	(184)	[1]				(167)	[1]		(17)	[1]		0	[1]		0	[1]
Restructuring Reserve, Payments and Impairments	(711)					(58)			17			(670)			0
Restructuring Reserve, End of Period	$ 787			$ 787		$ 434		$ 659	$ 0		$ 0	$ 277		$ 947	$ 76		$ 76

[1] (1) Includes curtailment benefit of $125 related to International defined benefit plan. Additional information is included in note 9, "Benefit Plans."