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Earnings Per Share - Additional Information (Detail) (Convertible Debt, USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Jun. 30, 2011	Jun. 30, 2010
Convertible Debt
Debt Instrument [Line Items]
Principal amount of outstanding long-term debt	$ 1,250	$ 1,250	$ 1,250

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer.

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