Pension and Postretirement Benefit Plans (Obligations and Funded Status) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2013
Pension [Member]
Change in Benefit Obligation [Roll Forward]
Benefit obligation, beginning of year	$ 152,608	$ 140,549
Service cost	12,173	10,196	$ 10,100
Interest cost	5,582	5,604	4,911
Participant contributions	0	0
Actuarial loss (gain)	(1,996)	4,083
Plan amendments	0	915
Benefits paid (including lump sums)	(12,940)	(8,739)
Benefit obligation, end of year	155,427	152,608	140,549
Change in Plan Assets [Roll Forward]
Fair value of plan assets, beginning of year	145,179	128,267
Actual return on plan assets	3,857	25,117
Employer contributions	5,490	534
Participant contributions	0	0
Benefits paid (including lump sums)	(12,940)	(8,739)
Fair value of plan assets, end of year	141,586	145,179	128,267
Under funded status, end of year	(13,841)	(7,429)
Postretirement [Member]
Change in Benefit Obligation [Roll Forward]
Benefit obligation, beginning of year	10,445	12,302
Service cost	117	170	377
Interest cost	407	480	611
Participant contributions	802	842
Actuarial loss (gain)	(1,007)	(114)
Plan amendments	0	(1,732)
Benefits paid (including lump sums)	(1,356)	(1,503)
Benefit obligation, end of year	9,408	10,445	12,302
Change in Plan Assets [Roll Forward]
Fair value of plan assets, beginning of year	0	0
Actual return on plan assets	0	0
Employer contributions	554	661
Participant contributions	802	842
Benefits paid (including lump sums)	(1,356)	(1,503)
Fair value of plan assets, end of year	0	0	$ 0
Under funded status, end of year	$ (9,408)	$ (10,445)