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Share-based compensation and other benefit plans (Tables) | 12 Months Ended
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Jun. 30, 2012
Stock Option Activity | Stock option activity, under the Plans for the three years ended June 30, 2012, consists of the following (shares in thousands):
|  | Shares |  |  | Weighted Average Exercise Price |  |  | Weighted Avg. Contractual Life (Yrs.) |  |  | Aggregate Intrinsic Value |
Outstanding at June 30, 2009 |  |  | 398 |  |  | $ | 49.49 |  |  |  |  |  |  |  |  |
Granted |  |  | 115 |  |  |  | 64.71 |  |  |  |  |  |  |  |  |
Exercised |  |  | (73 | ) |  |  | 44.67 |  |  |  |  |  |  |  |  |
Outstanding at June 30, 2010 |  |  | 440 |  |  |  | 56.26 |  |  |  |  |  |  |  |  |
Granted |  |  | 188 |  |  |  | 71.71 |  |  |  |  |  |  |  |  |
Exercised |  |  | (129 | ) |  |  | 41.48 |  |  |  |  |  |  |  |  |
Outstanding at June 30, 2011 |  |  | 499 |  |  |  | 64.15 |  |  |  |  |  |  |  |  |
Granted |  |  | 95 |  |  |  | 71.94 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (2 | ) |  |  | 76.15 |  |  |  |  |  |  |  |  |
Exercised |  |  | (17 | ) |  |  | 50.98 |  |  |  |  |  |  |  |  |
Outstanding at June 30, 2012 |  |  | 575 |  |  | $ | 65.78 |  |  |  | 5.8 |  |  |  | $5.1 million |
Exercisable at June 30: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2010 |  |  | 367 |  |  | $ | 51.96 |  |  |  |  |  |  |  |  |
2011 |  |  | 309 |  |  |  | 58.80 |  |  |  |  |  |  |  |  |
2012 |  |  | 403 |  |  |  | 62.67 |  |  |  | 5.7 |  |  |  | $4.7 million |
Assumptions Used in Black-Scholes Option-Pricing Model | The fair values of options granted under the Plans were estimated on the date of grant using the Black-Scholes option-pricing model with the following assumptions used:
|  | Year Ended June 30, |
|  | 2012 |  |  | 2011 |  |  | 2010 |
Dividend yield |  |  | 1.5% |  |  |  | 1.5% |  |  |  | 1.6% |
Expected volatility |  |  | 22%-23% |  |  |  | 22%-27% |  |  |  | 22%-30% |
Risk-free interest rates |  |  | 0.9%-2.0% |  |  |  | 1.3%-2.3% |  |  |  | 1.7%-3.1% |
Expected lives |  |  | 6 years |  |  |  | 5 years |  |  |  | 6 years |

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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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