Significant Customer and Geographic Information - Revenue by Geographic Region (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended															12 Months Ended
	Mar. 31, 2015		Dec. 31, 2014	Sep. 30, 2014		Jun. 30, 2014		Mar. 31, 2014		Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues by geographic region	$ 37,047	[1]	$ 36,747	$ 40,945	[2]	$ 50,272	[3]	$ 51,771	[4]	$ 54,844	[5]	$ 55,387	[6]	$ 54,148	[7]	$ 165,011	$ 216,150	$ 195,642
United States of America
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues by geographic region																70,977	101,275	79,930
Taiwan
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues by geographic region																13,099	13,405	22,684
Hong Kong
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues by geographic region																21,808	21,477	22,044
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues by geographic region																982	6,085	2,053
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues by geographic region																24,728	33,625	35,216
Japan
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues by geographic region																22,974	23,125	13,237
Malaysia
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues by geographic region																4,666	5,788	4,733
Singapore
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues by geographic region																5,594	9,745	10,399
Other Asia
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues by geographic region																173	1,217	4,621
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues by geographic region																$ 10	$ 408	$ 725

[1] The consolidated operating results for the fourth quarter of fiscal 2015 included a charge of $2.1 million related to the Veloce consideration, a charge of $4.1 million related to restructuring and an impairment charge of $0.5 million related to a strategic investment.

[2] The consolidated operating results for the second quarter of fiscal 2015 included an impairment charge of $2.5 million related to a strategic investment.

[3] The consolidated operating results for the first quarter of fiscal 2015 included a charge of $7.1 million related to the Veloce consideration and a charge of $1.2 million related to restructuring.

[4] The consolidated operating results for the fourth quarter of fiscal 2014 included a gain on sale of building of $25.8 million.

[5] The consolidated operating results for the third quarter of fiscal 2014 included a charge of $2.9 million related to the Veloce consideration.

[6] The consolidated operating results for the second quarter of fiscal 2014 included a charge of $30.4 million related to the Veloce consideration and a charge of $1.0 million related to restructuring.

[7] The consolidated operating results for the first quarter of fiscal 2014 included a charge of $9.3 million related to the Veloce consideration and a gain on sale of TPack of $19.7 million.