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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Oct. 31, 2017 | Oct. 31, 2016
Cash flows from operating activities: |  |
Net income | $ 105,676 | $ 124,572
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 106,526 | 94,530
Stock-based compensation | 13,700 | 4,948
Loss on disposal of assets and impairment charges | 1,091 | 294
Deferred income taxes | 21,543 | 19,839
Changes in assets and liabilities: |  |
Receivables | 746 | (5,229)
Inventories | (39,035) | (2,854)
Prepaid expenses | 2,412 | (1,952)
Accounts payable | 69 | (3,239)
Accrued expenses | 8,907 | (1,221)
Income taxes | 20,604 | 13,238
Other, net | (676) | (2,842)
Net cash provided by operating activities | 241,563 | 240,084
Cash flows from investing activities: |  |
Purchase of property and equipment | (248,797) | (203,602)
Payments for acquisition of businesses, net of cash acquired | (22,781) | (5,596)
Proceeds from sales of property and equipment | 2,297 | 1,726
Net cash used in investing activities | (269,281) | (207,472)
Cash flows from financing activities: |  |
Proceeds from long-term debt | 400,000 | 100,000
Repayments of long-term debt | (7,708) | (7,697)
Net repayments of short-term debt | (900) | 0
Proceeds from exercise of stock options | 298 | 1,719
Payments of cash dividends | (19,235) | (17,988)
Repurchase of common stock | (132,613) | 0
Tax withholdings on employee share-based awards | (3,656) | (6,448)
Net cash provided by financing activities | 236,186 | 69,586
Net increase in cash and cash equivalents | 208,468 | 102,198
Cash and cash equivalents at beginning of the period | 76,717 | 75,775
Cash and cash equivalents at end of the period | 285,185 | 177,973
Cash paid during the period for: |  |
Interest, net of amount capitalized | 21,428 | 20,065
Income taxes, net | 21,414 | 33,038
Noncash investing and financing activities: |  |
Purchased property and equipment in accounts payable | 12,563 | 12,980
Shares repurchased in accounts payable | $ 575 | $ 0

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Period Type: | duration

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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://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

X
- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration