Stock-Based Compensation (Narrative) (Details) (USD $)	12 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2009
Stock-based compensation expense	$ 2,316,000	$ 1,649,000	$ 963,000
Stock Options [Member]
Options outstanding	0
Grants of stock options	0	0	0
Stock-based compensation expense	0	0	0
Cash received from the exercise of stock options		4,000,000
Stock option exercises	0
Tax benefit realized from exercise of stock options		300,000
Aggregate intrinsic value of options exercised		900,000
Gross windfall tax benefits		44,000
Share Based Compensation Arrangement 1995 Key Employee Stock Option Plan [Member]
Common shares reserved for issuance to qualified key employees	3,000,000
Maximum term, in years, of stock awards granted	five years
Plan expiration date	August 2005
Share Based Compensation Arrangement 2005 Stock Plan [Member]
Common shares reserved for issuance to qualified key employees	2,000,000
Maximum term, in years, of stock awards granted	five years
Stock-Settled Stock Appreciation Rights [Member]
Stock-based compensation expense	1,120,000	684,000	353,000
Stock option exercises	70,000
Vesting schedule	The SSSARs from each of these grants vest one-third on the first anniversary of the grant date, one-third on the second anniversary of the grant date and one-third on the third anniversary of the grant date.
Expected forfeiture rate	4.00%	4.00%	4.00%
Aggregate intrinsic value of options exercised	922,000	926,000	19,000
Gross windfall tax benefits	334,000	324,000	7,000
Unrecognized compensation cost	2,000,000
Weighted-average period over which remaining compensation cost will be recognized	2.01
Grant date fair value per award	$ 10.12	$ 11.81	$ 6.89
Restricted Stock [Member]
Stock-based compensation expense	1,177,000	948,000	612,000
Gross windfall tax benefits	145,000	43,000	0
Unrecognized compensation cost	1,300,000
Weighted-average period over which remaining compensation cost will be recognized	1.72
Restricted stock granted	15,000
Additional shares of restricted stock vested	30,000
Grant date fair value per award	$ 54.35
Employee Restricted Stock [Member]
Vesting schedule	The restricted stock under each of these grants vests on the third anniversary of the grant date.
Expected forfeiture rate	4.00%	4.00%	4.00%
Restricted stock granted	7,000	25,000	6,000
Additional shares of restricted stock vested	21,500
Grant date fair value	390,000	1,470,000	231,000
Grant date fair value per award	$ 57.78	$ 58.79	$ 39.86
Director Restricted Stock [Member]
Vesting schedule	one
Restricted stock granted	8,155
Additional shares of restricted stock vested	8,435	14,000	3,000
Grant date fair value	$ 400,000
Grant date fair value per award	$ 51.52