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Related Party Transactions	12 Months Ended
Related Party Transactions	May 31, 2018
Related Party Transactions [Abstract]
Related Party Transactions	Note S – Related Party Transactions We purchase from, and sell to, affiliated companies certain raw materials and services at prevailing market prices. Net sales to affiliated companies for fiscal 2018, fiscal 2017 and fiscal 2016 totaled $57,382,000, $56,588,000, and $32,496,000, respectively. Purchases from affiliated companies for fiscal 2018, fiscal 2017 and fiscal 2016 totaled $7,292,000, $7,145,000, and $15,737,000, respectively. Accounts receivable from affiliated companies were $2,479,000 and $4,616,000 at May 31, 2018 and 2017, respectively. Accounts payable to affiliated companies were $76,000 at May 31, 2017.