Company-Sponsored Employee Benefit Plans (Investment Strategy) (Details) (Qualified pension plan [Member])	12 Months Ended
	Jun. 30, 2012
Actual investment allocation	100.00%
U.S. Equity [Member]
Target investment allocation range minimum	23.00%
Target investment allocation range maximum	31.00%
Actual investment allocation	31.00%
International equity [Member]
Target investment allocation range minimum	23.00%
Target investment allocation range maximum	31.00%
Actual investment allocation	30.00%
Core Fixed Income [Member]
Target investment allocation range minimum	11.00%
Target investment allocation range maximum	17.00%
Actual investment allocation	12.00%
Long duration fixed income [Member]
Target investment allocation range minimum	10.00%
Target investment allocation range maximum	18.00%
Actual investment allocation	15.00%
High yield fixed income [Member]
Target investment allocation range minimum	7.00%
Target investment allocation range maximum	11.00%
Actual investment allocation	9.00%
Alternative investments [Member]
Target investment allocation range minimum	5.00%
Target investment allocation range maximum	15.00%
Actual investment allocation	3.00%