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Condensed Consolidated Statements Of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Statement of Comprehensive Income [Abstract]        
Net Income $ 38,956 $ 34,511 $ 72,356 $ 62,139
Defined Benefit Pension and Postretirement Benefit Plans:        
Prior service credit arising during the period, before tax 0 2,038 0 2,038
Amortization of loss, before tax 168 127 338 258
Amortization of prior service credit, before tax (45) (31) (90) (32)
Total Other Comprehensive Income, Before Tax 123 2,134 248 2,264
Tax Attributes of Items in Other Comprehensive Income:        
Prior service credit arising during the period, tax 0 (753) 0 (753)
Amortization of loss, tax (62) (48) (125) (97)
Amortization of prior service credit, tax 17 12 33 12
Total Tax Expense (45) (789) (92) (838)
Other Comprehensive Income, Net of Tax 78 1,345 156 1,426
Comprehensive Income $ 39,034 $ 35,856 $ 72,512 $ 63,565