Balance Sheet Components - Intangible Assets, Net (Detail) (USD $) In Thousands, unless otherwise specified							12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014 Product formulas	Mar. 31, 2013 Product formulas	Mar. 31, 2014 Other intangible assets	Mar. 31, 2013 Other intangible assets	Mar. 31, 2014 Minimum	Mar. 31, 2014 Minimum Product formulas	Mar. 31, 2014 Minimum Other intangible assets	Mar. 31, 2014 Maximum	Mar. 31, 2014 Maximum Product formulas	Mar. 31, 2014 Maximum Other intangible assets
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 1,212	$ 1,212	$ 1,023	$ 1,023	$ 189	$ 189
Accumulated amortization	(157)	(96)	(119)	(68)	(38)	(28)
Net carrying amount	$ 1,055	$ 1,116	$ 904	$ 955	$ 151	$ 161
Useful life of intangible assets							5 years	5 years	5 years	25 years	25 years	25 years