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Pension and Postretirement Benefit Plans (Narrative) (Details) - USD ($)
12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2015
Jan. 01, 2017
Dec. 31, 2016
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       4.00% 3.00%
Defined Contribution Plan, Employer Matching Percentage of Employee Contributions from Four to Five Percent of Eligible Compensation       50.00%  
Employer matching percentage of the next 2% of employee contributions         50.00%
Maximum percentage of employee eligible compensation with 50% matching contributions by employer       1.00% 2.00%
Defined Contribution Plan, Employer Matching Percentage of Employee Contributions up to First Four Percent of Eligible Compensation       100.00%  
Company contribution expense $ 10,900,000 $ 9,600,000 $ 9,700,000    
Postretirement Life Insurance [Member] | Key Officers and Retirees [Member]          
Deferred Compensation Arrangements [Abstract]          
Net periodic pension cost 500,000 400,000 $ 400,000    
Accrued liability 4,300,000 4,600,000      
Pension [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Accumulated benefit obligation 154,000,000 144,800,000      
Expected benefit payments in fiscal 2017 22,207,000        
Amounts to be Recognized as Net Periodic Benefit Costs in Next Fiscal Year [Abstract]          
Net actuarial gains (losses) (2,100,000)        
Prior service costs (credit) 300,000        
Postretirement [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Expected benefit payments in fiscal 2017 657,000        
Amounts to be Recognized as Net Periodic Benefit Costs in Next Fiscal Year [Abstract]          
Net actuarial gains (losses) 300,000        
Prior service costs (credit) (300,000)        
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