Number of shares issued for each share of convertible preferred stock that is converted.

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Investment in short-term money-market instruments (such as commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and so forth) which are highly liquid (that is, readily convertible to known amounts of cash) and so near their maturity that they present an insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify as cash equivalents by definition. Original maturity means an original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

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Fair Value of Financial Instruments - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	Sep. 30, 2012	Sep. 30, 2012 Maximum	Mar. 31, 2011 Common Stock
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Number of shares of common stock issued for each share of preferred stock (in shares)			1
Money market fund value	$ 51.5
Money market fund, original maturity date		3 months