Stock-Based Compensation (Details Textual) (USD $)	12 Months Ended
Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2010
Stock Based Compensation (Textual) [Abstract]
Unrecognized stock-based compensation expense	$ 7,600,000
Unrecognized stock-based compensation expense related to nonvested deferred shares	6,600,000
Unrecognized stock-based compensation expense related to stock options	1,000,000
Weighted average period	2 years 1 month 6 days
Stock based compensation expense recognized tax	1,300,000	900,000	700,000
Share awards authorized	2,300,000
Share awards grant	522,000
Common stock grant expiration term	10 years
Number of options granted	282,450
Description of vesting period of director awards	After three year
Vesting period of director awards	3 years
Total intrinsic value of stock option	120,000	200,000	200,000
Exercise of stock options, shares	26,500	32,000	31,900
Weighted average fair value	$ 10.23	$ 9.52	$ 9.70
Minimum threshold shares scheduled to vest for performance based shares	43,000
Average grant date fair value		$ 10.57	$ 9.74
Expense originally reversed	$ 3,504,000	$ 2,395,000	$ 2,052,000
Deferred shares granted		405,500	516,675
Deferred shares vested and released	184,149	126,428	165,291
Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Employee Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period, equal annual installments	1 year
Employee Award [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	5 years
Employee Award [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	4 years
Performance Based Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pro-rate of original awards, minimum	0.00%
Pro-rate of original awards maximum	100.00%
Percentage of additional original awards	50.00%
Market Based Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pro-rate of original awards, minimum	0.00%
Pro-rate of original awards maximum	100.00%
Percentage of additional original awards	50.00%

Additional award as percentage of original awards in form of phantom shares.

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Share based compensation arrangement by share based payment award award description of vesting period of director award.

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Share based compensation arrangement by share based payment award award vesting period of director awards.

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Share based compensation arrangement by share based payment award deferred grants in period.

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Share based compensation arrangement by share based payment award deferred shares vested and released.

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Share based compensation arrangement by share based payment award installment period for vesting.

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As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Aggregate unrecognized cost of share-based awards, other than options, made to employees under an equity-based compensation plan, that have yet to vest.

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Aggregate unrecognized cost of option awards made to employees under a stock option plan or plans, that have yet to vest.

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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

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

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