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Summary Of Significant Accounting Policies (Tables)
 9 Months Ended
Mar. 31, 2024
Accounting Policies [Abstract]  
Schedule Of Construction In Progress In Accounts Payable Purchases of property, plant and equipment included in Accounts Payable and excluded from the property additions and the change in accounts payable in the Condensed Consolidated Statements of Cash Flows were as follows: 
 March 31,
 20242023
Construction in progress in Accounts Payable$4,144 $9,281 
Schedule Of Basic And Diluted Net Income Per Common Share Calculations
Basic and diluted net income per common share were calculated as follows:
Three Months Ended 
March 31,		Nine Months Ended 
March 31,
 2024202320242023
Net income$28,350 $24,555 $123,785 $102,120 
Net income available to participating securities(65)(43)(333)(246)
Net income available to common shareholders$28,285 $24,512 $123,452 $101,874 
Weighted average common shares outstanding – basic27,436 27,465 27,437 27,462 
Incremental share effect from:
Nonparticipating restricted stock2 1 3 2 
Stock-settled stock appreciation rights (1)
4 19 7 12 
Performance units9 2 8 3 
Weighted average common shares outstanding – diluted27,451 27,487 27,455 27,479 
Net income per common share – basic and diluted$1.03 $0.89 $4.50 $3.71 
(1)Excludes the impact of 0.1 million weighted average stock-settled stock appreciation rights outstanding for the nine months ended March 31, 2024 and 2023 because their effect was antidilutive.
Schedule Of Amounts Reclassified Out Of Accumulated Other Comprehensive Loss
The following table presents the amounts reclassified out of accumulated other comprehensive loss by component:
Three Months Ended 
March 31,		Nine Months Ended 
March 31,
2024202320242023
Accumulated other comprehensive loss at beginning of period$(9,214)$(10,982)$(9,365)$(11,172)
Defined Benefit Pension Plan Items:
Amortization of unrecognized net loss158 181 475 544 
Postretirement Benefit Plan Items:
Amortization of unrecognized net gain(15)(11)(45)(34)
Amortization of prior service credit(45)(45)(135)(136)
Total other comprehensive income, before tax98 125 295 374 
Total tax expense(23)(28)(69)(87)
Other comprehensive income, net of tax75 97 226 287 
Accumulated other comprehensive loss at end of period$(9,139)$(10,885)$(9,139)$(10,885)