Inventories	3 Months Ended
Jul. 31, 2017
Inventory Disclosure [Abstract]
Inventories	Inventories Inventories are valued at the lower of cost or market. 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 $272 million higher than reported as of April 30, 2017, and $278 million higher than reported as of July 31, 2017. Changes in the LIFO valuation reserve for interim periods are based on a proportionate allocation of the estimated change for the entire fiscal year.

Inventories

3 Months Ended

Jul. 31, 2017

Inventories are valued at the lower of cost or market. 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 $272 million higher than reported as of April 30, 2017, and $278 million higher than reported as of July 31, 2017. Changes in the LIFO valuation reserve for interim periods are based on a proportionate allocation of the estimated change for the entire fiscal year.