Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Oct. 31, 2014	Oct. 31, 2013
OPERATING ACTIVITIES
Net income	$ 16,909	$ 11,926
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	7,390	7,183
Net (gain) loss on disposal of property, plant and equipment	32	(10)
Gain on insurance recoveries	0	(94)
Stock-based compensation expense	1,764	1,730
Deferred income taxes	1,209	3,085
Pension contributions in excess of expense	(1,465)	(847)
Tax benefit from stock-based compensation	(35)	(475)
Other non-cash items	2,600	437
Changes in operating assets and liabilities:
Customer receivables	(8,452)	(10,261)
Inventories	(4,732)	(2,287)
Prepaid expenses and other assets	(75)	(579)
Accounts payable	2,027	3,032
Accrued compensation and related expenses	(1,470)	611
Other accrued expenses	2,935	2,361
Net Cash Provided by Operating Activities	18,637	15,812
INVESTING ACTIVITIES
Payments to acquire property, plant, and equipment	(6,347)	(3,793)
Proceeds from sales of property, plant, and equipment	15	50
Proceeds from insurance recoveries	0	94
Investment in certificates of deposit	(18,000)	0
Investment in promotional displays	(1,652)	(2,147)
Net Cash Used by Investing Activities	(25,984)	(5,796)
FINANCING ACTIVITIES
Payments of long-term debt	(614)	(456)
Proceeds from issuance of common stock	7,850	11,498
Repurchase of common stock	(5,053)	0
Notes receivable, net	292	0
Tax benefit from stock-based compensation	35	475
Net Cash Provided by Financing Activities	2,510	11,517
Net Increase (Decrease) in Cash and Cash Equivalents	(4,837)	21,533
Cash And Cash Equivalents, Beginning of Period	135,700	96,971
Cash And Cash Equivalents, End of Period	$ 130,863	$ 118,504