Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Jan. 31, 2014	Jan. 31, 2013
OPERATING ACTIVITIES
Net income	$ 14,827	$ 4,568
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	10,859	10,967
Net (gain) loss on disposal of property, plant and equipment	(1)	107
Gain on sales of assets held for sale	0	(481)
Gain on insurance recoveries	(94)	(399)
Stock-based compensation expense	2,518	2,648
Deferred income taxes	4,427	2,994
Pension contributions in excess of expense	(1,591)	(4,360)
Tax benefit from stock-based compensation	(480)	(331)
Other non-cash items	982	325
Changes in operating assets and liabilities:
Customer receivables	(9,051)	(8,552)
Inventories	(839)	(5,689)
Prepaid expenses and other assets	(805)	(835)
Accounts payable	1,613	3,449
Accrued compensation and related expenses	(4,069)	419
Other accrued expenses	5,248	(2,593)
Net Cash Provided by Operating Activities	23,544	2,237
INVESTING ACTIVITIES
Payments to acquire property, plant, and equipment	(5,553)	(7,667)
Proceeds from sales of property, plant, and equipment	65	75
Proceeds from insurance recoveries	94	399
Proceeds from sales of assets held for sale	0	6,447
Investment in promotional displays	(2,883)	(3,426)
Net Cash Used by Investing Activities	(8,277)	(4,172)
FINANCING ACTIVITIES
Payments of long-term debt	(1,056)	(830)
Proceeds from issuance of common stock	14,391	1,818
Tax benefit from stock-based compensation	480	331
Net Cash Provided by Financing Activities	13,815	1,319
Net Increase (Decrease) in Cash And Cash Equivalents	29,082	(616)
Cash And Cash Equivalents, Beginning of Period	96,971	66,620
Cash And Cash Equivalents, End of Period	$ 126,053	$ 66,004