Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	9 Months Ended
	Jan. 31, 2021	Jan. 31, 2020
OPERATING ACTIVITIES
Net income	$ 55,936,000	$ 61,848,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	76,482,000	73,362,000
Net (gain) loss on disposal of property, plant and equipment	(2,008,000)	350,000
Reduction in the carrying amount of operating lease right-of-use assets	20,252,000	19,462,000
Amortization of debt issuance costs	1,901,000	1,963,000
Unrealized gain on foreign exchange forward contracts	(1,720,000)	(244,000)
Stock-based compensation expense	3,543,000	3,122,000
Deferred income taxes	(8,939,000)	(8,623,000)
Pension contributions in excess of expense	(1,505,000)	(964,000)
Contributions of employer stock to employee benefit plan	3,743,000	3,772,000
Other non-cash items	1,899,000	314,000
Changes in operating assets and liabilities:
Customer receivables	(43,564,000)	5,170,000
Income taxes receivable	(4,070,000)	(5,229,000)
Inventories	(33,835,000)	(14,289,000)
Prepaid expenses and other assets	(6,606,000)	(6,785,000)
Accounts payable	31,293,000	4,438,000
Accrued compensation and related expenses	9,309,000	(9,193,000)
Operating lease liabilities	(18,161,000)	(16,731,000)
Marketing and other accrued expenses	23,559,000	465,000
Net cash provided by operating activities	107,509,000	112,208,000
INVESTING ACTIVITIES
Payments to acquire property, plant and equipment	(25,479,000)	(25,563,000)
Proceeds from sales of property, plant and equipment	3,872,000	321,000
Maturities of certificates of deposit	0	1,500,000
Investment in promotional displays	(7,757,000)	(6,471,000)
Net cash used by investing activities	(29,364,000)	(30,213,000)
FINANCING ACTIVITIES
Payments of long-term debt	(81,889,000)	(91,833,000)
Proceeds from issuance of common stock	0	295,000
Withholding of employee taxes related to stock-based compensation	(1,351,000)	(1,050,000)
Excess Tax Benefit from Share-based Compensation, Financing Activities	(172,000)	0
Net cash used by financing activities	(83,412,000)	(92,588,000)
Net decrease in cash and cash equivalents	(5,267,000)	(10,593,000)
Cash and cash equivalents, beginning of period	97,059,000	57,656,000
Cash and cash equivalents, end of period	91,792,000	47,063,000
Non-cash investing and financing activities:
Property, plant and equipment included in accounts payable at period end	1,130	1,953
Cash paid during the period for:
Interest	11,757	17,322
Income taxes	$ 31,830	$ 35,870