Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
Jan. 31, 2015	Jan. 31, 2014
Cash flows from operating activities:
Net income	$ 139,285us-gaap_NetIncomeLoss	$ 105,878us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	113,955us-gaap_DepreciationAndAmortization	95,604us-gaap_DepreciationAndAmortization
Other amortization	260	223
Stock based compensation	6,292us-gaap_ShareBasedCompensation	4,001us-gaap_ShareBasedCompensation
Loss on disposal of assets and impairment charges	584	2,880
Deferred income taxes	27,631	10,118
Excess tax benefits related to stock option exercises	(3,014)	(1,615)
Changes in assets and liabilities:
Receivables	3,624	(4,167)
Inventories	39,228us-gaap_IncreaseDecreaseInInventories	84us-gaap_IncreaseDecreaseInInventories
Prepaid expenses	(1,428)	(696)
Accounts payable	(80,747)	(31,101)
Accrued expenses	(16,580)	28,665
Income taxes	10,986	1,028
Other, net	(216)us-gaap_OtherNoncashIncomeExpense	(216)us-gaap_OtherNoncashIncomeExpense
Net cash provided by operating activities	239,860	210,686
Cash flows from investing activities:
Purchase of property and equipment	(292,144)	(242,548)
Payments for acquisition of businesses, net of cash acquired	(37,073)	(26,583)
Proceeds from sales of property and equipment	2,158	2,219
Net cash used in investing activities	(327,059)	(266,912)
Cash flows from financing activities:
Proceeds from long-term debt	0	200,000
Repayments of long-term debt	(456)us-gaap_RepaymentsOfLongTermDebt	(8,144)us-gaap_RepaymentsOfLongTermDebt
Net borrowings (repayments) of short-term debt	18,500	(59,100)
Proceeds from exercise of stock options	10,535	2,912
Payments of cash dividends	(22,398)us-gaap_PaymentsOfDividends	(20,168)us-gaap_PaymentsOfDividends
Excess tax benefits related to stock option exercises	3,014	1,615
Net cash provided by financing activities	9,195	117,115
Net (decrease) increase in cash and cash equivalents	(78,004)	60,889
Cash and cash equivalents at beginning of the period	121,641	41,271
Cash and cash equivalents at end of the period	43,637	102,160
Cash paid during the period for:
Interest, net of amount capitalized	24,536us-gaap_InterestPaidNet	19,969us-gaap_InterestPaidNet
Income taxes	42,352us-gaap_IncomeTaxesPaid	48,960us-gaap_IncomeTaxesPaid
Noncash investing and financing activities:
Property and equipment acquired through capitalized lease obligations	0us-gaap_CapitalLeaseObligationsIncurred	1,169us-gaap_CapitalLeaseObligationsIncurred
Purchased property and equipment in accounts payable	$ 4,644	$ 0

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- Definition

The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585

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- Definition

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

+ References

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- Definition

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

+ References

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- 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://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

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-Publisher FASB

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-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

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- Definition

The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

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-Section 50

-Paragraph 2

-Subparagraph (j)

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-Section 45

-Paragraph 14

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

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

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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.

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-Publisher FASB

-Name Accounting Standards Codification

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