Inventories	9 Months Ended
Jan. 31, 2021
Inventory Disclosure [Abstract]
Inventories	InventoriesInventories are valued at the lower of cost or net realizable value. Some of our consolidated inventories are valued using the last-in, first-out (LIFO) method, which we use for the majority of our U.S. inventories. If the LIFO method had not been used, inventories at current cost would have been $311 million higher than reported as of April 30, 2020, and $342 million higher than reported as of January 31, 2021. Changes in the LIFO valuation reserve for interim periods are based on an allocation of the projected change for the entire fiscal year, recognized proportionately over the remainder of the fiscal year.

The entire disclosure for inventory. Includes, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the classes of inventory, and the nature of the cost elements included in inventory.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 330
-URI http://asc.fasb.org/topic&trid=2126998

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