Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	9 Months Ended
	Jan. 31, 2020	Jan. 31, 2019
OPERATING ACTIVITIES
Net income	$ 61,848,000	$ 61,664,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	73,362,000	70,284,000
Net loss on disposal of property, plant and equipment	350,000	661,000
Reduction in the carrying amount of operating lease right-of-use assets	19,462,000	0
Amortization of debt issuance costs	1,963,000	2,054,000
Unrealized gain on foreign exchange forward contracts	(244,000)	(291,000)
Gain on insurance recoveries	0	(580,000)
Stock-based compensation expense	3,122,000	2,290,000
Deferred income taxes	(8,623,000)	(5,757,000)
Pension contributions in excess of expense	(964,000)	(7,727,000)
Excess Tax Benefit from Share-based Compensation, Operating Activities	0	5,171,000
Contributions of employer stock to employee benefit plan	3,772,000	3,623,000
Other non-cash items	314,000	(222,000)
Changes in operating assets and liabilities:
Customer receivables	5,170,000	19,201,000
Income taxes receivable	(5,229,000)	27,265,000
Inventories	(14,289,000)	(11,731,000)
Prepaid expenses and other assets	(6,785,000)	(5,726,000)
Accounts payable	4,438,000	(8,323,000)
Accrued compensation and related expenses	(9,193,000)	724,000
Operating lease liabilities	(16,731,000)	0
Marketing and other accrued expenses	465,000	(4,288,000)
Net cash provided by operating activities	112,208,000	137,950,000
INVESTING ACTIVITIES
Payments to acquire property, plant and equipment	(25,563,000)	(26,294,000)
Proceeds from sales of property, plant and equipment	321,000	59,000
Proceeds from insurance recoveries	0	580,000
Acquisition of business, net of cash acquired	0	(7,182,000)
Maturities of certificates of deposit	1,500,000	7,000,000
Investment in promotional displays	(6,471,000)	(5,462,000)
Net cash used by investing activities	(30,213,000)	(31,299,000)
FINANCING ACTIVITIES
Payments of long-term debt	(91,833,000)	(100,631,000)
Proceeds from issuance of common stock	295,000	500,000
Payments for Repurchase of Common Stock	0	40,950,000
Withholding of employee taxes related to stock-based compensation	(1,050,000)	(1,739,000)
Excess Tax Benefit from Share-based Compensation, Financing Activities	0	(232,000)
Net cash used by financing activities	(92,588,000)	(143,052,000)
Net decrease in cash and cash equivalents	(10,593,000)	(36,401,000)
Cash and cash equivalents, beginning of period	57,656,000	78,410,000
Cash and cash equivalents, end of period	47,063,000	42,009,000
Non-cash investing and financing activities:
Property, plant and equipment included in accounts payable at period end	1,953	462
Cash paid during the period for:
Interest	17,322	23,442
Income taxes	$ 35,870	$ 13,109