Pension and Postretirement Benefit Plans (Narrative) (Details) - USD ($)	12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2013
401(k) Savings and Investment Plan [Abstract]
Maximum percentage of eligible compensation allowed for employee contributions	50.00%
Employer matching percentage of the first 3% of employee contributions	100.00%
Maximum percentage of employee eligible compensation with 100% matching contributions by employer	3.00%
Employer matching percentage of the next 2% of employee contributions	50.00%
Maximum percentage of employee eligible compensation with 50% matching contributions by employer	2.00%
Company contribution expense	$ 9,700,000	$ 9,300,000	$ 8,700,000
Defined Benefit Postretirement Life Insurance [Member] | Key Officers and Retirees [Member]
Deferred Compensation Arrangements [Abstract]
Net periodic pension cost	400,000	300,000	$ 300,000
Accrued liability	4,200,000	4,100,000
Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	143,400,000	138,300,000
Expected benefit payments in fiscal 2016	21,239,000
Amounts to be Recognized as Net Periodic Benefit Costs in Next Fiscal Year [Abstract]
Net actuarial gains (losses)	(600,000)
Prior service costs (credit)	200,000
Postretirement [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected benefit payments in fiscal 2016	700,000
Amounts to be Recognized as Net Periodic Benefit Costs in Next Fiscal Year [Abstract]
Net actuarial gains (losses)	700,000
Prior service costs (credit)	(400,000)
Common stock [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Company stock included in equity securities plan assets	0	0
Class B stock [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Company stock included in equity securities plan assets	$ 0	$ 0