Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Apr. 30, 2013	Apr. 30, 2012	Apr. 30, 2011
OPERATING ACTIVITIES
Net income (loss)	$ 9,758	$ (20,786)	$ (20,018)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	14,431	23,387	26,703
Net loss on disposal of property, plant and equipment	231	180	209
Impairment loss related to restructuring activities	270	7,913	0
(Gain) loss on sale of assets held for sale	(481)	111	(982)
Gain on insurance recoveries	(975)	0	0
Stock-based compensation expense	3,509	3,413	3,995
Deferred income taxes	5,789	(12,290)	(8,185)
Pension contributions (in excess) less than expense	(4,299)	4,528	6,907
Tax benefit from stock-based compensation	(18)	0	(80)
Other non-cash items	944	867	(971)
Changes in operating assets and liabilities:
Customer receivables	(6,825)	(1,533)	(3,514)
Inventories	(7,068)	115	331
Income taxes receivable and other assets	(1,669)	(320)	5,709
Accounts payable	3,814	923	4,534
Accrued compensation, marketing and other accrued expenses	7,116	9,545	(1,442)
Net Cash Provided by Operating Activities	24,527	16,053	13,196
INVESTING ACTIVITIES
Payments to acquire property, plant, and equipment	(8,860)	(6,679)	(4,952)
Proceeds from sales of property, plant, and equipment	80	15	3
Proceeds from sale of assets held for sale	6,447	56	2,939
Proceeds from insurance recoveries	975	0	0
Investment in promotional displays	(4,759)	(3,310)	(3,456)
Net Cash Used in Investing Activities	(6,117)	(9,918)	(5,466)
FINANCING ACTIVITIES
Payments of long-term debt	(1,019)	(1,021)	(892)
Change in restricted cash	7,064	7,355	0
Tax benefit from stock-based compensation	18	0	80
Proceeds from issuance of common stock and other	5,878	18	399
Payment of dividends	0	(1,287)	(5,130)
Net Cash Provided (Used) by Financing Activities	11,941	5,065	(5,543)
Net Increase in Cash And Cash Equivalents	30,351	11,200	2,187
Cash and Cash Equivalents, Beginning of Year	66,620	55,420	53,233
Cash and Cash Equivalents, End of Year	$ 96,971	$ 66,620	$ 55,420