Short Term Investments - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
Dec. 31, 2014	Mar. 31, 2014
Investment [Line Items]
Short-term Investments	15,033us-gaap_ShortTermInvestments	$ 32,194us-gaap_ShortTermInvestments
Certificates of Deposit Maturing in January 30, 2015
Investment [Line Items]
Certificate of deposit, maturity period	Jan. 30, 2015
Certificates of Deposit Maturing in April 30, 2015
Investment [Line Items]
Short-term Investments	15,100
Certificate of deposit, maturity period	Apr. 30, 2015

Investments which are intended to be sold in the short term (usually less than one year or the normal operating cycle, whichever is longer) including trading securities, available-for-sale securities, held-to-maturity securities, and other short-term investments not otherwise listed in the existing taxonomy.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.2)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Subparagraph g

-Article 7

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