Inventories	9 Months Ended
Jan. 31, 2018
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 $293 million higher than reported as of January 31, 2018. 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

9 Months Ended

Jan. 31, 2018

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 $293 million higher than reported as of January 31, 2018. Changes in the LIFO valuation reserve for interim periods are based on a proportionate allocation of the estimated change for the entire fiscal year.