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Inventories	9 Months Ended
Inventories	Jan. 31, 2013
Inventory Disclosure [Abstract]
Inventories	Inventories We use the last-in, first-out (“LIFO”) method to determine the cost of most of our inventories. If the LIFO method had not been used, inventories at current cost would have been $213.0 million higher than reported as of April 30, 2012, and $213.2 million higher than reported as of January 31, 2013. Changes in the LIFO valuation reserve for interim periods are based on a proportionate allocation of the estimated change for the entire fiscal year.

The entire disclosure for inventory. This may include, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the major classes of inventory, and the nature of the cost elements included in inventory. If inventory is stated above cost, accrued net losses on firm purchase commitments for inventory and losses resulting from valuing inventory at the lower-of-cost-or-market may also be included. For LIFO inventory, may disclose the amount and basis for determining the excess of replacement or current cost over stated LIFO value and the effects of a LIFO quantities liquidation that impacts net income.

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