Pension and Postretirement Benefit Plans (Obligations and Funded Status) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Pension [Member]
Change in Benefit Obligation [Roll Forward]
Benefit obligation, beginning of year	$ 155,427	$ 152,608
Service cost	11,908	12,173	$ 10,196
Interest cost	5,874	5,582	5,604
Participant contributions	0	0
Actuarial loss (gain)	15,085	(1,996)
Benefits paid (including lump sums)	(26,402)	(12,940)
Benefit obligation, end of year	161,892	155,427	152,608
Change in Plan Assets [Roll Forward]
Fair value of plan assets, beginning of year	141,586	145,179
Actual return on plan assets	1,129	3,857
Employer contributions	6,270	5,490
Participant contributions	0	0
Benefits paid (including lump sums)	(26,402)	(12,940)
Fair value of plan assets, end of year	122,583	141,586	145,179
Under funded status, end of year	(39,309)	(13,841)
Postretirement [Member]
Change in Benefit Obligation [Roll Forward]
Benefit obligation, beginning of year	9,408	10,445
Service cost	101	117	170
Interest cost	385	407	480
Participant contributions	748	802
Actuarial loss (gain)	565	(1,007)
Benefits paid (including lump sums)	(1,541)	(1,356)
Benefit obligation, end of year	9,666	9,408	10,445
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	793	554
Participant contributions	748	802
Benefits paid (including lump sums)	(1,541)	(1,356)
Fair value of plan assets, end of year	0	0	$ 0
Under funded status, end of year	$ (9,666)	$ (9,408)