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Benefit Plans (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2012
Defined Benefit Plan Disclosure [Line Items]      
Defined Contribution Plan Profit Sharing Percentage Of Income Before Income Taxes 5.00%    
Change in plan assets:      
Fair value of plan assets at beginning of year $ 6,697    
Fair value of plan assets at end of year 7,245    
Amounts recognized in the consolidated balance sheets:      
Postemployment benefits 23,611 30,919  
Pension Benefits [Member]
      
Change in benefit obligation:      
Benefit obligation at beginning of the year 40,664 47,151  
Service cost 77 78 289
Interest cost 1,180 1,260 2,047
Plan participants' contributions 0 0  
Benefits paid (7,251) (6,183)  
Amendments 188 (17)  
Actuarial (gain) loss during year (300) (1,625)  
Benefit obligation at end of year 34,558 40,664 47,151
Change in plan assets:      
Fair value of plan assets at beginning of year 6,697 6,439  
Actual gain (loss) on plan assets 763 424  
Employer contributions 7,036 6,017  
Fair value of plan assets at end of year 7,245 6,697 6,439
Funded status at end of year (27,313) (33,967)  
Amounts recognized in the consolidated balance sheets:      
Other current liabilities 6,390 6,666  
Postemployment benefits 20,923 27,301  
Net amount recognized 27,313 33,967  
Amounts recognized in accumulated other comprehensive income (loss):      
Net actuarial (loss) gain (6,474) (7,732)  
Prior service cost (293) (196)  
Total amounts recognized in accumulated other comprehensive (loss) income (6,767) (7,928)  
Retiree Health Care Benefits [Member]
      
Change in benefit obligation:      
Benefit obligation at beginning of the year 3,719 5,148  
Service cost 48 80 30
Interest cost 139 188 237
Plan participants' contributions 63 65  
Benefits paid (246) (254)  
Amendments 0 (1,788)  
Actuarial (gain) loss during year (933) 280  
Benefit obligation at end of year 2,790 3,719 5,148
Change in plan assets:      
Fair value of plan assets at beginning of year 0 0  
Actual gain (loss) on plan assets 0 0  
Employer contributions 183 189  
Fair value of plan assets at end of year 0 0 0
Funded status at end of year (2,790) (3,719)  
Amounts recognized in the consolidated balance sheets:      
Other current liabilities 220 220  
Postemployment benefits 2,570 3,499  
Net amount recognized 2,790 3,719  
Amounts recognized in accumulated other comprehensive income (loss):      
Net actuarial (loss) gain 960 65  
Prior service cost 1,490 1,760  
Total amounts recognized in accumulated other comprehensive (loss) income $ 2,450 $ 1,825