Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jul. 31, 2014	Jul. 31, 2013
OPERATING ACTIVITIES
Net income	$ 9,238	$ 6,655
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	3,683	3,542
Net (gain) loss on disposal of property, plant and equipment	9	(27)
Gain on insurance recoveries	0	(94)
Stock-based compensation expense	943	861
Deferred income taxes	597	1,438
Pension contributions in excess of expense	(587)	(398)
Tax benefit from stock-based compensation	(5)	(197)
Other non-cash items	860	(319)
Changes in operating assets and liabilities:
Customer receivables	(5,128)	(6,441)
Inventories	(3,996)	(1,497)
Prepaid expenses and other assets	641	191
Accounts payable	2,419	443
Accrued compensation and related expenses	(3,551)	(4,694)
Other accrued expenses	4,144	2,797
Net Cash Provided by Operating Activities	9,267	2,260
INVESTING ACTIVITIES
Payments to acquire property, plant, and equipment	(2,477)	(1,851)
Proceeds from sales of property, plant, and equipment	7	50
Proceeds from insurance recoveries	0	94
Investment in promotional displays	(802)	(1,243)
Net Cash Used by Investing Activities	(3,272)	(2,950)
FINANCING ACTIVITIES
Payments of long-term debt	(282)	(224)
Proceeds from issuance of common stock	600	4,186
Repurchase of common stock	(4,064)	0
Notes receivable, net	167	0
Tax benefit from stock-based compensation	5	197
Net Cash Provided (Used) by Financing Activities	(3,574)	4,159
Net Increase in Cash and Cash Equivalents	2,421	3,469
Cash And Cash Equivalents, Beginning of Period	135,700	96,971
Cash And Cash Equivalents, End of Period	$ 138,121	$ 100,440