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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOW - UNAUDITED - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Jan. 31, 2019 | Jan. 31, 2018
Operating Activities |  |  |
Net income |  | $ 105,021 | $ 138,126
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Amortization of intangibles |  | 39,825 | 35,965
Amortization of product development spending |  | 29,301 | 30,314
Depreciation and amortization of technology, property and equipment |  | 52,414 | 48,471
Restructuring charges |  | 3,562 | 26,531
Stock-based compensation expense |  | 14,974 | 6,510
Royalty advances |  | (100,454) | (89,366)
Earned royalty advances |  | 94,240 | 81,976
Impairment of publishing brand |  | 0 | 3,600
Other non-cash credits |  | 10,898 | (4,976)
Net change in operating assets and liabilities |  | (202,173) | (86,484)
Net Cash Provided by Operating Activities |  | 47,608 | 190,667
Investing Activities |  |  |
Product development spending |  | (14,251) | (30,426)
Additions to technology, property and equipment |  | (49,988) | (78,958)
Businesses acquired in purchase transaction, net of cash acquired |  | (190,467) | 0
Acquisitions of publication rights and other |  | (4,386) | (25,227)
Net Cash Used in Investing Activities |  | (259,092) | (134,611)
Financing Activities |  |  |
Repayment of long-term debt |  | (217,200) | (238,951)
Borrowing of long-term debt |  | 490,512 | 305,754
Purchase of treasury shares |  | (34,994) | (29,257)
Change in book overdrafts |  | (6,657) | (8,884)
Cash dividends |  | (56,963) | (55,093)
Net proceeds from exercise of stock options and other |  | 6,278 | 30,606
Net Cash Provided by Financing Activities |  | 180,976 | 4,175
Effects of Exchange Rate Changes on Cash, Cash Equivalents, and Restricted Cash | [1] | (6,359) | 10,015
Cash, Cash Equivalents and Restricted Cash |  |  |
(Decrease)/Increase for the Period | [1] | (36,867) | 70,246
Balance at Beginning of Period | [1] | 170,257 | 58,516
Balance at End of Period | [1] | 133,390 | 128,762
Cash Paid During the Period for: |  |  |
Interest |  | 10,781 | 10,766
Income taxes, net of refunds |  | 29,604 | 39,655
Warrants [Member] |  |  |
Non-cash items associated with acquisition |  |  |
Warrants to purchase 0.4 million shares of Wiley Class A Common Stock issued in connection with the Learning House acquisition |  |  | $ 0
Learning House [Member] | Warrants [Member] |  |  |
Non-cash items associated with acquisition |  |  |
Warrants to purchase 0.4 million shares of Wiley Class A Common Stock issued in connection with the Learning House acquisition |  | $ 565 |
[1] | Due to the retrospective adoption of ASU 2016-18, "Statement of Cash Flows (Topic 230): Restricted Cash," we are now required to include restricted cash as part of the change in cash, cash equivalents, and restricted cash. As a result, amounts which were previously classified as cash flows from operating activities have been reclassified as they are recognized in the total change in cash, cash equivalents and restricted cash. Refer to Note 2, "Recent Accounting Standards," in the Notes to Unaudited Condensed Consolidated Financial Statements for more information.

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- Definition The net cash inflow or outflow from the excess drawing from an existing cash balance, which will be honored by the bank but reflected as a loan to the drawer. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3098-108585 + 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 + Details
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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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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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 + Details
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