Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
Apr. 30, 2018	Apr. 30, 2017	Apr. 30, 2016
Cash flows from operating activities
Net income	$ 317,903	$ 177,485	$ 225,982
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	220,970	197,629	170,937
Stock-based compensation	18,800	10,697	7,413
Loss on disposal of assets and impairment charges	2,281	2,298	837
Deferred income taxes	(98,178)	45,190	55,492
Changes in assets and liabilities:
Receivables	(1,801)	(15,543)	(5,092)
Inventories	(38,406)	4,400	(7,390)
Prepaid expenses	3,413	(6,171)	(983)
Accounts payable	14,751	40,332	3,011
Accrued expenses	15,967	14,780	14,983
Income taxes	(30,053)	(6,226)	7,064
Other, net	(5,850)	(5,598)	132
Net cash provided by operating activities	419,797	459,273	472,386
Cash flows from investing activities
Purchase of property and equipment	(577,421)	(433,392)	(392,839)
Payments for acquisitions of businesses, net of cash acquired	(37,160)	(25,473)	(7,263)
Proceeds from sales of property and equipment	5,246	4,140	5,134
Net cash used in investing activities	(609,335)	(454,725)	(394,968)
Cash flows from financing activities
Proceeds from long-term debt	400,000	100,000	0
Repayments of long-term debt	(15,688)	(15,399)	(15,399)
Net borrowings of short-term debt	38,700	900	0
Proceeds from exercise of stock options	1,377	2,357	3,717
Payments of cash dividends	(38,780)	(36,758)	(33,527)
Repurchase of common stock	(214,683)	(47,893)	0
Tax withholdings on employee share-based awards	(4,426)	(6,813)	(4,975)
Net cash provided by (used in) financing activities	166,500	(3,606)	(50,184)
Net (decrease) increase in cash and cash equivalents	(23,038)	942	27,234
Cash and cash equivalents at beginning of year	76,717	75,775	48,541
Cash and cash equivalents at end of year	53,679	76,717	75,775
SUPPLEMENTAL DISCLOSURES OF CASH FLOWS INFORMATION
Cash paid during the year for interest, net of amount capitalized	48,757	41,268	40,401
Cash paid for income taxes, net	24,274	52,961	60,049
Noncash investing and financing activities
Purchased property and equipment in accounts payable	12,014	10,883	11,619
Shares repurchased in accounts payable	$ 2,232	$ 1,481	$ 0

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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.

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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

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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

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- 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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- Definition

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

+ References

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- 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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- References

No definition available.

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