Income Taxes (Schedule Of Significant Components Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands	Apr. 30, 2015	Apr. 30, 2014
Deferred tax assets:
Pension benefits	$ 23,074	$ 15,381
Accounts receivable	5,523	4,603
Product liability	1,031	745
Employee benefits	7,429	8,523
Net operating loss carryforward	0	469
Other	266	199
Total	37,323	29,920
Deferred tax liabilities:
Inventory	451	496
Depreciation	3,485	2,374
Total	3,936	2,870
Net deferred tax asset	$ 33,387	$ 27,050