Balance Sheet Details (Details) (USD $)	3 Months Ended					12 Months Ended																	3 Months Ended					12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Building	Dec. 31, 2012 Building	Dec. 31, 2013 Computer software	Dec. 31, 2012 Computer software	Dec. 31, 2013 Computer equipment	Dec. 31, 2012 Computer equipment	Dec. 31, 2013 Furniture and fixtures	Dec. 31, 2012 Furniture and fixtures	Dec. 31, 2013 Leasehold improvements	Dec. 31, 2012 Leasehold improvements	Dec. 31, 2013 Machinery	Dec. 31, 2012 Machinery	Dec. 31, 2013 Construction in progress	Dec. 31, 2012 Construction in progress	Dec. 31, 2013 LDT Building Improvements	Sep. 30, 2012 LDT Building Improvements	Dec. 31, 2013 LDT Machinery	Dec. 31, 2013 LDT Software	Sep. 30, 2012 LDT Software	Dec. 31, 2013 Facility Closing [Member]	Jan. 31, 2013 MTSPELLC Amended [Member] sqft	Nov. 04, 2011 MTSPELLC Amended [Member] sqft
Property, plant and equipment, net
Property, plant and equipment, gross	$ 123,456,000			$ 153,348,000		$ 123,456,000	$ 153,348,000		$ 40,320,000	$ 42,129,000	$ 22,068,000	$ 36,349,000	$ 29,869,000	$ 29,371,000	$ 12,360,000	$ 12,708,000	$ 7,024,000	$ 9,731,000	$ 11,533,000	$ 13,501,000	$ 282,000	$ 9,559,000
Less accumulated depreciation and amortization	(50,814,000)			(66,443,000)		(50,814,000)	(66,443,000)
Property, plant and equipment, net	72,642,000			86,905,000		72,642,000	86,905,000
Tangible asset impairment charges																							3,500,000	5,800,000	500,000	200,000	600,000
Total space under lease (in square feet)																													31,000	31,000
Restructuring costs	2,200,000	1,100,000	2,200,000	700,000	6,600,000	5,546,000	7,301,000	0																				2,000,000
Construction costs capitalized				6,700,000			6,700,000
Construction in progress, capitalized	40,300,000			48,800,000		40,300,000	48,800,000
Depreciation expense						$ 15,451,000	$ 13,190,000	$ 11,894,000