Long-Term Debt (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Maximum borrowing capacity	$ 160	$ 160
Maximum borrowing capacity on obtaining consent of the issuing bank	260	260
Line of credit facility, expiration date	October 2012
Line of credit facility, amount outstanding	0	0
Interest paid	0	0
Standby Letters of Credit [Member]
Letters of credit outstanding borrowings	$ 6.6
Maximum [Member]
Leverage ratio	3
Minimum [Member]
Interest coverage ratio	2.5