Credit Arrangements (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jun. 30, 2013
Credit agreement capacity	$ 10.0
Interest rate over LIBOR	1.00%
Interest rate under prime rate	1.00%
Assets Held-in-trust	5.8
Letters Of Credit [Member]
Credit agreement capacity	4.0
Line of Credit Facility, Amount Outstanding	2.3
Line of Credit Facility, Remaining Borrowing Capacity	7.7
Unsecured [Member]
Credit agreement capacity	$ 8.0