Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2015
Cash flows from operating activities
Net income	$ 177,485	$ 225,982	$ 180,628
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	197,629	170,937	156,111
Stock-based compensation	10,697	7,413	7,307
Loss on disposal of assets and impairment charges	2,298	837	2,370
Deferred income taxes	45,190	55,492	44,711
Changes in assets and liabilities:
Receivables	(15,543)	(5,092)	3,232
Inventories	4,400	(7,390)	10,365
Prepaid expenses	(6,171)	(983)	(547)
Accounts payable	40,332	3,011	(33,290)
Accrued expenses	14,780	14,983	(14,205)
Income taxes receivable	(6,226)	7,064	(7,801)
Other, net	(5,598)	132	(236)
Net cash provided by operating activities	459,273	472,386	348,645
Cash flows from investing activities
Purchase of property and equipment	(433,392)	(392,839)	(360,734)
Payments for acquisitions of businesses, net of cash acquired	(25,473)	(7,263)	(41,157)
Proceeds from sales of property and equipment	4,140	5,134	2,748
Net cash used in investing activities	(454,725)	(394,968)	(399,143)
Cash flows from financing activities
Proceeds from long-term debt	100,000	0	0
Repayments of long-term debt	(15,399)	(15,399)	(553)
Net borrowings of short-term debt	900	0	0
Proceeds from exercise of stock options	2,357	3,717	11,465
Payments of cash dividends	(36,758)	(33,527)	(30,175)
Repurchase of common stock	(47,893)	0	0
Tax withholdings on employee share-based awards	(6,813)	(4,975)	(3,339)
Net cash used in financing activities	(3,606)	(50,184)	(22,602)
Net increase (decrease) in cash and cash equivalents	942	27,234	(73,100)
Cash and cash equivalents at beginning of year	75,775	48,541	121,641
Cash and cash equivalents at end of year	76,717	75,775	48,541
SUPPLEMENTAL DISCLOSURES OF CASH FLOWS INFORMATION
Cash paid during the year for interest, net of amount capitalized	41,268	40,401	41,382
Cash paid for income taxes, net	52,961	60,049	64,367
Noncash investing and financing activities
Purchased property and equipment in accounts payable	10,883	11,619	9,060
Shares repurchased in accounts payable	$ 1,481	$ 0	$ 0

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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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

+ Details

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

- References

No definition available.

+ Details

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