Share Based Awards (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended	12 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Mar. 31, 2011
Summary of Stock Option Activity
Number of Shares Outstanding Beginning Balance	698,778
Weighted Average Exercise Price Outstanding Beginning Balance	$ 44.40
Weighted Average Remaining Contractual Life Outstanding Beginning Balance	5.0		3.9
Number of Share Granted	229,700
Weighted Average Exercise Price Granted	$ 86.08
Weighted Average Remaining Contractual Life Granted	7.9
Number of Shares Exercised	(86,952)
Weighted Average Exercise Price Exercised	$ 39.42
Weighted Average Remaining Contractual Life Exercised	1.8
Aggregate Intrinsic Value, Exercised	$ 4,163
Number of Shares Forfeited/Canceled	0
Weighted Average Exercise Price Forfeited/Canceled	$ 0.00
Weighted Average Remaining Contractual Life Forfeited/Canceled	0.0
Number of Shares Outstanding Ending Balance	841,526		698,778
Weighted Average Exercise Price Outstanding Ending Balance	$ 56.29		$ 44.40
Weighted Average Remaining Contractual Life Outstanding Ending Balance	5.0		3.9
Aggregate Intrinsic Value Outstanding Ending Balance	26,097
Number of Shares Vested and expected to vest	819,212
Weighted Average Exercise Price Vested and expected to vest	$ 56.14
Weighted Average Remaining Contractual Life Vested and expected to vest	5.0
Aggregate Intrinsic Value Vested and expected to vest	25,530
Number of Shares Exercisable	273,873
Weighted Average Exercise Price Exercisable	$ 36.23
Weighted Average Remaining Contractual Life Exercisable	2.2
Aggregate Intrinsic Value Exercisable	$ 13,986
Schedule of Share Based Compensation Valuation Assumption
Expected life	4.3	4.2
Expected volatility	41.2%	44.6% - 44.7%
Expected dividends	1.60%	2.10%
Risk-free rate	1.8%	2.0% - 2.1%

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Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Range Of Expected Dividend Rate.

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Share Based Compensation Arrangement By Share Based Payment Award Options Granted Weighted Average Remaining Contractual Term.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The period of time a share-based award is expected to be outstanding. A share-based award's expected term shall be determined based on, among other factors, the instrument's contractual term and the effects of employees' expected exercise and post-vesting employment termination behavior. An entity is required to aggregate individual awards into relatively homogeneous groups.

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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 decrease in the number of reserved shares that could potentially be issued attributable to the exercise or conversion during the reporting period of previously issued stock options under the option plan.

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The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan.

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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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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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The weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated during the reporting period due to noncompliance with plan terms during the reporting period.

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The quantity of shares issuable on stock options awarded under the plan during the reporting 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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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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The weighted average period between the balance-sheet date and expiration for all awards outstanding under the plan, which may be expressed in a decimal value for number of years.

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As of the balance sheet date, the total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices of fully vested and expected to vest options that are exercisable.

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As of the balance sheet date, the number of shares for which fully vested and expected to vest stock options can be exercised under the option plan.

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As of the balance sheet date, the weighted-average exercise price (at which grantees can acquire the shares reserved for issuance) for exercisable stock options that are fully vested or expected to vest.

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The weighted-average period between the balance-sheet date and expiration date for fully vested and expected to vest options that are exercisable (or convertible) under the plan, which may be expressed in a decimal value for number of years.

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As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan.

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As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest.

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The weighted-average period between the balance-sheet date and expiration date for fully vested and expected to vest options outstanding, which may be expressed in a decimal value for number of years.

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