Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2017
OPERATING ACTIVITIES
Net income	$ 83,688,000	$ 63,141,000	$ 71,199,000
Adjustments to reconcile net income to net cash and cash equivalents provided by operating activities:
Depreciation and amortization	94,446,000	45,004,000	18,682,000
Net loss on disposal of property, plant and equipment	1,973,000	615,000	444,000
Amortization of debt issuance costs	2,724,000	0	0
Gain on sales of assets held for sale	0	257,000	0
Gain on insurance recoveries	(580,000)	0	0
Stock-based compensation expense	3,040,000	3,097,000	3,469,000
Deferred income taxes	(7,805,000)	21,404,000	9,899,000
Pension contributions in excess of expense	(7,875,000)	(20,928,000)	(27,840,000)
Excess tax benefit from stock-based compensation	(5,266,000)	0	0
Contributions of employer stock to employee benefit plan	3,623,000	3,554,000	2,926,000
Other non-cash items	916,000	14,000	318,000
Changes in operating assets and liabilities:
Customer receivables	9,719,000	(18,786,000)	(7,780,000)
Inventories	(4,852,000)	2,802,000	(4,925,000)
Income taxes receivable	26,357,000	(7,295,000)	0
Prepaid expenses and other assets	(5,172,000)	(7,492,000)	(207,000)
Accounts payable	(4,775,000)	(858,000)	6,301,000
Accrued compensation and related expenses	6,225,000	(2,525,000)	773,000
Marketing and other accrued expenses	(5,541,000)	4,771,000	3,821,000
Net Cash Provided by Operating Activities	190,845,000	86,775,000	77,080,000
INVESTING ACTIVITIES
Payments to acquire property, plant, and equipment	(32,128,000)	(47,590,000)	(21,811,000)
Proceeds from sales of property, plant, and equipment	64,000	27,000	37,000
Proceeds From Insurance Recoveries	580,000	0	0
Acquisition of business, net of cash acquired	(7,182,000)	(57,200,000)	0
Purchases of certificates of deposit	0	(25,000,000)	(85,000,000)
Maturities of certificates of deposit	8,000,000	87,750,000	56,750,000
Investment in promotional displays	(7,257,000)	(2,303,000)	(3,720,000)
Net Cash Used by Investing Activities	(37,923,000)	(44,316,000)	(53,744,000)
FINANCING ACTIVITIES
Payments of long-term debt	(122,205,000)	(96,572,000)	(11,731,000)
Proceeds from long-term debt	0	734,000	3,477,000
Proceeds from issuance of common stock and other	500,000	1,289,000	2,366,000
Repurchase of common stock	(50,000,000)	(29,000,000)	(13,407,000)
Withholding of employee taxes related to stock-based compensation	(1,739,000)	(2,803,000)	(1,734,000)
Debt issuance cost	(232,000)	(14,675,000)	0
Notes receivable, net	0	0	208,000
Net Cash Provided (Used) by Financing Activities	(173,676,000)	(141,027,000)	(20,821,000)
Net Increase in Cash And Cash Equivalents	(20,754,000)	(98,568,000)	2,515,000
Cash And Cash Equivalents, Beginning of Year	78,410,000	176,978,000	174,463,000
Cash And Cash Equivalents, End of Year	57,656,000	78,410,000	176,978,000
Non-cash investing and financing activities:
Long-term debt related to funding acquisition	0	300,000	0
Long-term debt issued to satisfy outstanding debt	0	600,000	0
Long-term debt satisfied from issuance of debt	0	(602,750)	0
Stock issuance in connection with acquisition	0	189,849	0
Property, plant and equipment	1,331	5,530	0
Net other assets and liabilities related to acquisition	0	7,169	0
Cash paid during the period for:
Interest	35,908	5,919	596
Income taxes	$ 22,035	$ 18,219	$ 27,302