Credit Arrangements (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Sep. 30, 2013
Credit agreement capacity	$ 10.0
Interest rate over LIBOR	1.00%
Interest rate under prime rate	1.00%
Letters Of Credit [Member]
Credit agreement capacity	4.0
Line of Credit Facility, Amount Outstanding	2.7
Line of Credit Facility, Remaining Borrowing Capacity	7.3
Unsecured [Member]
Credit agreement capacity	$ 8.0