Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Oct. 31, 2012	Oct. 31, 2011
Operating Activities
Net income (loss)	$ 2,511	$ (5,692)
Adjustments to reconcile net income (loss) to net cash provided (used) by operating activities:
Depreciation and amortization	7,572	11,486
Net loss on disposal of property, plant, and equipment	100	69
Gain on sale of assets held for sale	(487)	0
Stock-based compensation expense	1,761	1,833
Deferred income taxes	1,723	(2,929)
Pension contributions (in excess) less than expense	(2,435)	3,215
Other non-cash items	(182)	(854)
Changes in operating assets and liabilities:
Customer receivables	(8,752)	2,534
Inventories	(5,469)	(346)
Income taxes receivable and other assets	(637)	449
Accounts payable	3,483	(3,140)
Accrued compensation and related expenses	215	2,456
Other accrued expenses	(1,157)	(1,202)
Net Cash Provided (Used) by Operating Activities	(1,754)	7,879
Investing Activities
Payments to acquire property, plant, and equipment	(5,129)	(2,990)
Proceeds from sales of property, plant, and equipment	75	15
Proceeds from sale of assets held for sale	6,447	0
Investment in promotional displays	(2,873)	(1,665)
Net Cash Used by Investing Activities	(1,480)	(4,640)
Financing Activities
Payments of long-term debt	(336)	(309)
Proceeds from issuance of common stock	0	18
Payment of dividends	0	(1,287)
Net Cash Used by Financing Activities	(336)	(1,578)
Net Increase (Decrease) in Cash And Cash Equivalents	(3,570)	1,661
Cash And Cash Equivalents, Beginning of Period	66,620	55,420
Cash And Cash Equivalents, End of Period	$ 63,050	$ 57,081