Basis of Presentation (Policies)	9 Months Ended
Basis of Presentation (Policies)	Mar. 31, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Inventory, Policy [Policy Text Block]	Inventory The Company uses the LIFO method of valuing U.S. inventories. An actual valuation of inventory under the LIFO method can be made only at the end of each fiscal year based on the inventory levels and costs at that time. Accordingly, interim LIFO calculations are based on management’s estimates of expected year-end inventory levels and costs and are subject to the final year-end LIFO inventory determination. LIFO expense of $4,758 and $8,205 in the three months ended March 31, 2024 and 2023, respectively, and $12,726 and $26,118 in the nine months ended March 31, 2024 and 2023, respectively, is recorded in cost of sales in the condensed statements of consolidated income.
New Accounting Pronouncements, Policy [Policy Text Block]	Recently Issued Accounting Guidance In December 2023, the FASB issued its final standard to improve income tax disclosures. This standard, issued as ASU 2023-09, requires public business entities to annually disclose specific categories in the rate reconciliation and provide additional information for reconciling items that meet a quantitative threshold. This update is effective for annual periods beginning after December 15, 2024. The Company has not yet determined the impact of this pronouncement on its financial statements and related disclosures. In November 2023, the FASB issued its final standard to improve reportable segment disclosures. This standard, issued as ASU 2023-07, requires enhanced disclosures about significant segment expenses, enhanced interim disclosure requirements, clarifies circumstances in which an entity can disclose multiple segment measures of profit or loss, provides new segment disclosure requirements for entities with a single reportable segment, and contains other disclosure requirements. This update is effective for all public entities for fiscal years beginning after December 15, 2023, with the interim disclosure requirements being effective for fiscal years beginning after December 15, 2024. The Company has not yet determined the impact of this pronouncement on its financial statements and related disclosures. In July 2023, the SEC issued a final rule to require registrants to provide enhanced and standardized disclosures regarding cybersecurity risk management, strategy, governance, and incidents. The final rule establishes new requirements related to material cybersecurity incidents, which would need to be disclosed on Form 8-K within four business days of their being deemed material, and annual disclosures in Form 10-K pertaining to (1) cybersecurity risk management and strategy, (2) management's role in assessing and managing material risks from cybersecurity threats, and (3) the board of directors' oversight of cybersecurity risks. The Form 10-K disclosures are due beginning with annual reports for fiscal years ending on or after December 15, 2023, and the Form 8-K disclosures were due beginning December 18, 2023. The Company is complying with the disclosure requirements set forth in the final rule as each becomes effective.

Disclosure of inventory accounting policy for inventory classes, including, but not limited to, basis for determining inventory amounts, methods by which amounts are added and removed from inventory classes, loss recognition on impairment of inventories, and situations in which inventories are stated above cost.