. . . . . . . . . . . . . . . . . . . . . . $ 342.9 payable to sojitz america for the purchase of inventories , generally due 60 days after shipment of goods from a foreign port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $ 78.5 as of may 31 , 2009 , letters of credit of $ 154.8 million were outstanding , generally for the purchase of inventory