Pension Plans And Other Postretirement Benefit Plan (Schedule Of Net Periodic Benefit Cost) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011	Dec. 31, 2010
Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1,640	$ 1,519	$ 3,279	$ 3,350
Interest cost	1,724	1,587	3,448	3,095
Expected return on plan assets	(652)	(404)	(1,303)	(955)
Recognized actuarial loss (gain)	511	562	1,023	1,188
Amortization of unrecognized prior service cost (credit)	7	7	13	11
Net periodic benefit cost	3,230	3,271	6,460	6,689
Postretirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	45	50	107	90
Interest cost	76	85	180	162
Recognized actuarial loss (gain)	(11)	(19)	(11)	(48)
Amortization of unrecognized prior service cost (credit)	(55)	(33)	(88)	(66)
Net periodic benefit cost	$ 55	$ 83	$ 188	$ 138