Stock Option Activity (Detail) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	3 Months Ended
Sep. 30, 2011 Year
Shares
Outstanding at June 30, 2011	499
Granted	25
Exercised	(1)
Outstanding at September 30, 2011	523
Exercisable at September 30, 2011	314
Weighted Average Exercise Price
Outstanding at June 30, 2011	$ 64.15
Granted	$ 76.15
Exercised	$ 39.93
Outstanding at September 30, 2011	$ 64.78
Exercisable at September 30, 2011	$ 59.16
Weighted Average Contractual Life (Yrs.)
Outstanding at September 30, 2011	6.0
Exercisable at September 30, 2011	5.8
Aggregate Intrinsic Value
Outstanding at September 30, 2011	$ 2.9
Exercisable at September 30, 2011	$ 2.8

Share-based Compensation Arrangement by Share-based Payment Award, Options, Aggregate Intrinsic Value [Abstract]

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Share-based Compensation Arrangement by Share-based Payment Award, Options, Weighted Average Remaining Contractual Term [Abstract]

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The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices of vested portions of options outstanding and currently exercisable under the option plan as of the balance sheet date.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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The weighted average period between the balance sheet date and expiration for all vested portions of options outstanding and currently exercisable (or convertible) under the plan, which may be expressed in a decimal value for number of years.

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The weighted average price at which option holders acquired shares when converting their stock options into shares under the plan during the reporting period.

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Net number of share options (or share units) granted during the period.

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The weighted average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on stock options awarded under the plan during the reporting period.

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The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices pertaining to options outstanding under the plan as of the balance sheet date.

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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The weighted average price as of the beginning of the year at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Number of share options (or share units) exercised during the current period.

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