Income Taxes (Details 5) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Mar. 31, 2014
U.S. foreign tax credits
Tax credit carryforwards
Tax credits	$ 6,908
Fiscal Year of Expiration	2017
U.S. research credits
Tax credit carryforwards
Tax credits	533
Fiscal Year of Expiration	2023
Texas franchise tax credits
Tax credit carryforwards
Tax credits	$ 3,396
Fiscal Year of Expiration	2026

The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Carryforwards

-URI http://asc.fasb.org/extlink&oid=6506874

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant