Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2017
Cash flows from operating activities
Net income	$ 203,886	$ 317,903	$ 177,485
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	244,387	220,970	197,629
Stock-based compensation	16,410	18,800	10,697
Loss on disposal of assets and impairment charges	1,384	2,281	2,298
Deferred income taxes	45,337	(98,178)	45,190
Changes in assets and liabilities:
Receivables	7,189	(1,801)	(15,543)
Inventories	(29,648)	(38,406)	4,400
Prepaid expenses	(1,727)	3,413	(6,171)
Accounts payable	12,451	14,751	40,332
Accrued expenses	30,927	15,967	14,780
Income taxes	22,545	(30,053)	(6,226)
Other, net	(22,527)	(5,850)	(5,598)
Net cash provided by operating activities	530,614	419,797	459,273
Cash flows from investing activities
Purchase of property and equipment	(394,699)	(577,421)	(433,392)
Payments for acquisitions of businesses, net of cash acquired	(68,200)	(37,160)	(25,473)
Proceeds from sales of property and equipment	5,069	5,246	4,140
Net cash used in investing activities	(457,830)	(609,335)	(454,725)
Cash flows from financing activities
Proceeds from long-term debt	0	400,000	100,000
Repayments of long-term debt	(16,000)	(15,688)	(15,399)
Net borrowings of short-term debt	35,400	38,700	900
Proceeds from exercise of stock options	2,290	1,377	2,357
Payments of cash dividends	(41,430)	(38,780)	(36,758)
Repurchase of common stock	(37,479)	(214,683)	(47,893)
Tax withholdings on employee share-based awards	(5,948)	(4,426)	(6,813)
Net cash (used in) provided by financing activities	(63,167)	166,500	(3,606)
Net increase (decrease) in cash and cash equivalents	9,617	(23,038)	942
Cash and cash equivalents at beginning of year	53,679	76,717	75,775
Cash and cash equivalents at end of year	63,296	53,679	76,717
SUPPLEMENTAL DISCLOSURES OF CASH FLOWS INFORMATION
Cash paid during the year for interest, net of amount capitalized	56,306	48,757	41,268
Cash (received) paid for income taxes, net	(11,433)	24,274	52,961
Noncash investing and financing activities
Purchased property and equipment in accounts payable	15,616	12,014	10,883
Shares repurchased in accounts payable	$ 0	$ 2,232	$ 1,481

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585

+ Details

Name:	us-gaap_ProceedsFromIssuanceOfLongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585

+ Details

Name:	us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow from a borrowing having initial term of repayment within one year or the normal operating cycle, if longer.

+ References

+ Details

Name:	us-gaap_ProceedsFromShortTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=SL79508275-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

+ Details

Name:	us-gaap_RepaymentsOfLongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- References

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration