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Note O - Pension and Other Postretirement Benefit Plans - Plan Assets Using Fair Value Hierarchy (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Fair Value, Inputs, Level 3 [Member]      
Plan Assets $ 6,171 $ 6,113 $ 7,779
Pension Plan [Member]      
Plan Assets 87,291 90,258 $ 94,372
Pension Plan [Member] | Fair Value, Inputs, Level 1, 2 and 3 [Member]      
Plan Assets 33,301 35,634  
Pension Plan [Member] | Fair Value, Inputs, Level 1 [Member]      
Plan Assets 27,130 29,521  
Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member]      
Plan Assets  
Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member]      
Plan Assets 6,171 6,113  
Pension Plan [Member] | Fair Value Measured at Net Asset Value Per Share [Member]      
Plan Assets [1] 53,990 54,624  
Cash and Cash Equivalents [Member] | Pension Plan [Member] | Fair Value, Inputs, Level 1, 2 and 3 [Member]      
Plan Assets 971 1,156  
Cash and Cash Equivalents [Member] | Pension Plan [Member] | Fair Value, Inputs, Level 1 [Member]      
Plan Assets 971 1,156  
Cash and Cash Equivalents [Member] | Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member]      
Plan Assets  
Cash and Cash Equivalents [Member] | Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member]      
Plan Assets  
Company Common Stock [Member] | Pension Plan [Member] | Fair Value, Inputs, Level 1, 2 and 3 [Member]      
Plan Assets [2] 1,483 2,438  
Company Common Stock [Member] | Pension Plan [Member] | Fair Value, Inputs, Level 1 [Member]      
Plan Assets [2] 1,483 2,438  
Company Common Stock [Member] | Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member]      
Plan Assets [2]  
Company Common Stock [Member] | Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member]      
Plan Assets [2]  
Common Stock [Member] | Pension Plan [Member] | Fair Value, Inputs, Level 1, 2 and 3 [Member]      
Plan Assets [2] 16,713 17,373  
Common Stock [Member] | Pension Plan [Member] | Fair Value, Inputs, Level 1 [Member]      
Plan Assets [2] 16,713 17,373  
Common Stock [Member] | Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member]      
Plan Assets [2]  
Common Stock [Member] | Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member]      
Plan Assets [2]  
Mutual Fund [Member] | Pension Plan [Member] | Fair Value, Inputs, Level 1, 2 and 3 [Member]      
Plan Assets [3] 7,963 8,554  
Mutual Fund [Member] | Pension Plan [Member] | Fair Value, Inputs, Level 1 [Member]      
Plan Assets [3] 7,963 8,554  
Mutual Fund [Member] | Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member]      
Plan Assets [3]  
Mutual Fund [Member] | Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member]      
Plan Assets [3]  
Annuity Contracts [Member] | Pension Plan [Member] | Fair Value, Inputs, Level 1, 2 and 3 [Member]      
Plan Assets [4] 6,171 6,113  
Annuity Contracts [Member] | Pension Plan [Member] | Fair Value, Inputs, Level 1 [Member]      
Plan Assets [4]  
Annuity Contracts [Member] | Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member]      
Plan Assets [4]  
Annuity Contracts [Member] | Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member]      
Plan Assets [4] 6,171 6,113  
Investments Measured at Net Asset Value, Fixed Income Funds [Member] | Pension Plan [Member] | Fair Value Measured at Net Asset Value Per Share [Member]      
Plan Assets 33,568 31,852  
Investments Measured at Net Asset Value, Equity Securities [Member] | Pension Plan [Member] | Fair Value Measured at Net Asset Value Per Share [Member]      
Plan Assets 3,168 3,294  
Investments Measured at Net Asset Value, Real Estate [Member] | Pension Plan [Member] | Fair Value Measured at Net Asset Value Per Share [Member]      
Plan Assets 7,069 8,218  
Investments Measured at Net Asset Value, Hedge Funds [Member] | Pension Plan [Member] | Fair Value Measured at Net Asset Value Per Share [Member]      
Plan Assets $ 10,185 $ 11,260  
[1] In accordance with ASC 820-10, certain investments that were measured at net asset value per share (or its equivalent) have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the fair value of plan assets at the end of the year.
[2] Common stock is valued at the closing price reported on the active market on which the individual securities are traded. These securities include U.S. equity securities invested in companies that are traded on exchanges inside the U.S. and international equity securities invested in companies that are traded on exchanges outside the U.S.
[3] Mutual funds are valued at the daily closing price as reported by the fund. Mutual funds held by the Company's funded benefit plans are open-end mutual funds that are registered with the Securities Exchange Commission. These funds are required to publish their daily net asset value ("NAV") and to transact at that price. The mutual funds held by the Company's funded benefit plans are deemed to be actively traded.
[4] Annuity contracts represent contractual agreements in which payments are made to an insurance company, which agrees to pay out an income or lump sum amount at a later date. Annuity contracts are valued at the net present value of future cash flows.