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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOW - UNAUDITED - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Oct. 31, 2018 | Oct. 31, 2017
Operating Activities |  |  |
Net income |  | $ 70,079 | $ 69,284
Adjustments to reconcile net income to net cash used in operating activities: |  |  |
Amortization of intangibles |  | 25,050 | 23,802
Amortization of product development spending |  | 20,093 | 20,246
Depreciation and amortization of technology, property and equipment |  | 35,845 | 34,775
Restructuring charges |  | 3,910 | 24,323
Stock-based compensation expense |  | 8,882 | 2,536
Royalty advances |  | (50,580) | (46,860)
Earned royalty advances |  | 71,317 | 62,993
Impairment of publishing brand |  | 0 | 3,600
Other non-cash credits |  | 7,917 | 9,634
Net change in operating assets and liabilities |  | (313,610) | (250,145)
Net Cash Used in Operating Activities |  | (121,097) | (45,812)
Investing Activities |  |  |
Product development spending |  | (7,815) | (17,927)
Additions to technology, property and equipment |  | (34,560) | (53,469)
Acquisitions of publication rights and other |  | (2,795) | (6,097)
Net Cash Used in Investing Activities |  | (45,170) | (77,493)
Financing Activities |  |  |
Repayment of long-term debt |  | (65,800) | (78,492)
Borrowing of long-term debt |  | 245,075 | 275,081
Purchase of treasury shares |  | (24,994) | (29,257)
Change in book overdrafts |  | (3,066) | (2,629)
Cash dividends |  | (38,033) | (36,699)
Net proceeds from exercise of stock options and other |  | 7,283 | 7,347
Net Cash Provided by Financing Activities |  | 120,465 | 135,351
Effects of Exchange Rate Changes on Cash, Cash Equivalents, and Restricted Cash | [1] | (8,368) | 2,855
Cash, Cash Equivalents and Restricted Cash |  |  |
(Decrease)/Increase for the Period | [1] | (54,170) | 14,901
Balance at Beginning of Period | [1] | 170,257 | 58,516
Balance at End of Period | [1] | 116,087 | 73,417
Cash Paid During the Period for: |  |  |
Interest |  | 5,713 | 6,471
Income taxes, net of refunds |  | $ 18,404 | $ 26,398
[1] | Due to the retrospective adoption of ASU 2016-18, 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 Condensed Consolidated Financial Statements for more information.

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- Definition The expense charged against earnings for the periodic recognition of the advance royalties. These royalties are paid in one accounting period, but are deducted from earnings over time through amortization. For example, royalties that are required to be paid in advance of production from a mineral, oil, or gas property and amortized over the period of right to produce these items. + 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 (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 + 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 Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.P.3) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140864-122747 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + 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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