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Condensed Consolidated Statements Of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Statement of Comprehensive Income [Abstract]        
Net Income $ 29,011 $ 20,403 $ 91,150 $ 76,118
Defined Benefit Pension and Postretirement Benefit Plans:        
Prior service credit arising during the period, before tax 0 0 2,038 0
Amortization of loss, before tax 124 100 382 300
Amortization of prior service credit, before tax (47) (1) (79) (3)
Total Other Comprehensive Income, Before Tax 77 99 2,341 297
Tax Attributes of Items in Other Comprehensive Income:        
Prior service credit arising during the period, tax 0 0 (753) 0
Amortization of loss, tax (45) (38) (142) (111)
Amortization of prior service credit, tax 17 1 29 1
Total Tax Expense (28) (37) (866) (110)
Other Comprehensive Income, Net of Tax 49 62 1,475 187
Comprehensive Income $ 29,060 $ 20,465 $ 92,625 $ 76,305