Fair Value of Stock Option and SAR Award Weighted-Average Assumptions (Detail) (USD $)	12 Months Ended
Jun. 30, 2012 Y	Jun. 30, 2011 Y	Jun. 30, 2010 Y
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Risk-free interest rate	0.90%	1.50%	2.90%
Expected life of award (in years)	5.2	5.2	5.3
Expected dividend yield of stock	1.60%	1.50%	1.40%
Expected volatility of stock	37.30%	35.90%	34.50%
Weighted-average fair value	$ 20.30	$ 18.70	$ 15.77

The period of time an equity-based award is expected to be outstanding. An equity-based award's expected term is generally determined based on, among other factors, the instrument's contractual term and the effects of employees' expected exercise and post-vesting employment termination behavior.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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