Operating Segments (Reconciliation Of Reportable Segments Measure Of Profit Or Loss To Income) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating Income (Loss)	$ 32,183	$ 26,191	$ 24,779	$ 31,215	$ 32,613	$ 31,966	$ 30,815	$ 33,125	$ 114,368	$ 128,519	$ 101,798
Interest income									15,292	16,355	14,817
Interest expense									(3,423)	(4,456)	(7,473)
Income before income taxes									126,237	140,418	109,142
Reportable Segment [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating Income (Loss)									129,774	150,538	144,038
Corporate/Eliminations [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating Income (Loss)									$ (15,406)	$ (22,019)	$ (42,240)