Convertible Preferred Stock (Detail) (USD $) In Millions, except Share data, unless otherwise specified		0 Months Ended	12 Months Ended
	Mar. 31, 2014	Apr. 02, 2012 Common Stock	Mar. 31, 2012 Convertible Preferred Stock	Mar. 31, 2014 Convertible Preferred Stock	Mar. 31, 2013 Convertible Preferred Stock
Class of Stock [Line Items]
Common stock shares issued		15,221,571
Preferred Stock, Dividends, Per Share, Cash Paid			$ 1.07
Preferred stock, shares authorized	5,000,000			0	0
Preferred Stock, Shares Issued				0	0
Preferred Stock, Shares Outstanding				0	0
Payments of Ordinary Dividends, Preferred Stock and Preference Stock			$ 13.1