Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2019
OPERATING ACTIVITIES
Net income	$ 58,763,000	$ 74,861,000	$ 83,688,000
Adjustments to reconcile net income to net cash and cash equivalents provided by operating activities:
Depreciation and amortization	100,289,000	98,513,000	94,446,000
Net (gain) loss on disposal of property, plant and equipment	(1,859,000)	2,629,000	1,973,000
Reduction in carrying amount of operating lease right-of-use assets	27,192,000	25,405,000	0
Amortization of debt issuance costs	2,501,000	2,603,000	2,724,000
Unrealized (gain) loss on foreign exchange forward contracts	(1,102,000)	1,102,000	0
Loss on extinguishment of debt	(13,792,000)	0	0
Gain on insurance recoveries	0	0	(580,000)
Stock-based compensation expense	4,598,000	3,989,000	3,040,000
Deferred income taxes	(13,668,000)	(11,499,000)	(7,805,000)
Pension contributions in excess of expense	(2,007,000)	(1,130,000)	(7,875,000)
Net gain on debt forgiveness and modification	0	0	5,266,000
Contributions of employer stock to employee benefit plan	3,743,000	3,772,000	3,623,000
Other non-cash items	4,140,000	672,000	916,000
Changes in operating assets and liabilities:
Customer receivables	(42,829,000)	21,018,000	9,719,000
Inventories	(31,196,000)	(4,486,000)	(4,852,000)
Income taxes receivable	488,000	1,162,000	26,357,000
Prepaid expenses and other assets	(6,456,000)	(3,165,000)	(5,172,000)
Accounts payable	32,752,000	(6,237,000)	(4,775,000)
Accrued compensation and related expenses	1,226,000	(5,843,000)	6,225,000
Operating lease liabilities	(24,371,000)	(22,595,000)	0
Marketing and other accrued expenses	25,767,000	(3,229,000)	(5,541,000)
Net Cash Provided by Operating Activities	151,763,000	177,542,000	190,845,000
INVESTING ACTIVITIES
Payments to acquire property, plant and equipment	(35,734,000)	(31,670,000)	(32,128,000)
Proceeds from sales of property, plant and equipment	3,889,000	323,000	64,000
Proceeds from insurance recoveries	0	0	580,000
Acquisition of business, net of cash acquired	0	0	(7,182,000)
Maturities of certificates of deposit	0	1,500,000	8,000,000
Investment in promotional displays	(10,584,000)	(9,069,000)	(7,257,000)
Net Cash Used by Investing Activities	(42,429,000)	(38,916,000)	(37,923,000)
FINANCING ACTIVITIES
Payments of long-term debt	(432,508,000)	(98,468,000)	(122,205,000)
Proceeds from long-term debt	350,000,000	0	0
Proceeds from issuance of common stock and other	0	295,000	500,000
Repurchase of common stock	(20,000,000)	0	(50,000,000)
Withholding of employee taxes related to stock-based compensation	(1,351,000)	(1,050,000)	(1,739,000)
Debt issuance cost	(2,930,000)	0	(232,000)
Premium paid on debt extinguishment	(8,533,000)	0	0
Net Cash Provided (Used) by Financing Activities	(115,322,000)	(99,223,000)	(173,676,000)
Net (Decrease) Increase in Cash and Cash Equivalents	(5,988,000)	39,403,000	(20,754,000)
Cash and Cash Equivalents, Beginning of Year	97,059,000	57,656,000	78,410,000
Cash and Cash Equivalents, End of Year	91,071,000	97,059,000	57,656,000
Non-cash investing and financing activities:
Property, plant and equipment	2,527	1,303	1,331
Cash paid during the period for:
Interest	22,981	27,654	35,908
Income taxes	$ 33,055	$ 36,154	$ 22,035