Nuance Communications (NUAN) 10-Q 9 May 19 2019 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Mar. 31, 2019	Apr. 30, 2019
Document and Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q2
Trading Symbol	NUAN
Entity Registrant Name	Nuance Communications, Inc.
Entity Central Index Key	0001002517
Current Fiscal Year End Date	--09-30
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		290,153,159

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Document Period End Date			Mar. 31, 2019
Revenues:
Hosting and professional services	$ 251,111	$ 273,449	$ 510,699	$ 531,428
Product and licensing	97,543	130,446	255,540	255,194
Maintenance and support	60,929	62,298	136,998	126,795
Total revenues	409,583	466,193	903,237	913,417
Cost of revenues:
Hosting and professional services	153,637	180,257	316,807	351,784
Product and licensing	9,940	14,126	42,690	27,898
Maintenance and support	8,966	9,579	16,727	19,004
Amortization of intangible assets	9,048	13,058	18,805	26,572
Total cost of revenues	181,591	217,020	395,029	425,258
Gross profit	227,992	249,173	508,208	488,159
Operating expenses:
Research and development	65,848	66,698	134,176	132,784
Sales and marketing	75,755	74,857	151,114	155,417
General and administrative	40,422	73,183	84,471	124,956
Amortization of intangible assets	16,956	18,397	33,930	37,238
Acquisition-related costs, net	2,233	2,360	5,069	7,921
Restructuring and other charges, net	21,469	8,881	44,550	22,450
Goodwill and Intangible Asset Impairment	0	137,907	0	137,907
Total operating expenses	222,683	382,283	453,310	618,673
Income (loss) from operations	5,309	(133,110)	54,898	(130,514)
Other (expense) income:
Interest income	3,671	2,236	6,225	4,428
Interest expense	(31,152)	(33,866)	(63,418)	(69,936)
Other income (expense), net	465	(408)	(727)	(630)
Loss before income taxes	(21,707)	(165,148)	(3,022)	(196,652)
(Benefit) provision for income taxes	(958)	1,993	28	(76,976)
Net loss from continuing operations	77,332	(164,053)	96,422	(110,825)
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	98,081	3,088	99,472	8,851
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent	$ (20,749)	$ (167,141)	$ (3,050)	$ (119,676)
Net income (loss) per common share - basic:
Continuing operations	$ 0.27	$ (0.56)	$ 0.34	$ (0.38)
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Basic Share	0.34	0.01	0.35	0.03
Income (Loss) from Continuing Operations, Per Basic Share	(0.07)	(0.57)	(0.01)	(0.41)
Continuing operations	0.27	(0.56)	0.34	(0.38)
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Diluted Share	0.34	0.01	0.35	0.03
Income (Loss) from Continuing Operations, Per Diluted Share	$ (0.07)	$ (0.57)	$ (0.01)	$ (0.41)
Weighted average common shares outstanding:
Basic	285,866	294,103	286,849	292,720
Diluted	285,866	294,103	286,849	292,720
ASC 605
Revenues:
Hosting and professional services	$ 264,311		$ 531,935
Product and licensing	124,194		259,463
Maintenance and support	60,500		121,239
Total revenues	449,005		912,637
Cost of revenues:
Hosting and professional services	154,322		313,554
Product and licensing	16,525		31,245
Maintenance and support	8,247		16,774
Total cost of revenues	188,142		380,378
Operating expenses:
Sales and marketing	73,653		150,534
Other (expense) income:
(Benefit) provision for income taxes	$ 10,131		$ 10,707

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Document Period End Date			Mar. 31, 2019
Net income (loss)	$ 77,332	$ (164,053)	$ 96,422	$ (110,825)
Other comprehensive income (loss):
Foreign currency translation adjustment	5,255	4,096	(3,047)	5,611
Pension Adjustments	46	0	(314)	116
Unrealized (loss) gain on marketable securities	158	(71)	156	(348)
Total other comprehensive income (loss), net	5,459	4,025	(3,205)	5,379
Comprehensive income (loss)	$ 82,791	$ (160,028)	$ 93,217	$ (105,446)

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2019	Sep. 30, 2018
Current assets:
Cash and cash equivalents	$ 474,776	$ 315,963
Marketable securities	145,908	135,579
Accounts receivable, less allowances for doubtful accounts of $9,971 and $9,823	292,567	347,873
Prepaid expenses and other current assets	171,717	94,814
Disposal Group, Including Discontinued Operation, Assets, Current	0	34,402
Total current assets	1,084,968	928,631
Marketable Securities, Noncurrent	12,414	21,932
Land, building and equipment, net	142,968	153,452
Goodwill	3,238,410	3,247,105
Intangible assets, net	398,312	450,001
Other assets	255,928	141,761
Disposal Group, Including Discontinued Operation, Assets, Noncurrent	0	359,497
Total assets	5,133,000	5,302,379
Current liabilities:
Contingent And Deferred Acquisition Payments	12,249	14,211
Accounts payable	83,295	80,912
Accrued expenses and other current liabilities	211,471	269,339
Deferred revenue	300,746	330,689
Disposal Group, Including Discontinued Operation, Liabilities, Current	0	69,013
Total current liabilities	607,761	764,164
Long-term debt	1,911,185	2,185,361
Deferred revenue, net of current portion	414,437	434,316
Deferred tax liabilities	51,656	49,931
Other liabilities	103,214	93,593
Disposal Group, Including Discontinued Operation, Liabilities, Noncurrent	0	57,518
Total liabilities	3,088,253	3,584,883
Commitments and contingencies
Stockholders’ equity:
Common stock, $0.001 par value per share; 560,000 shares authorized; 290,038 and 291,504 shares issued and 286,287 and 287,753 shares outstanding, respectively	290	291
Additional paid-in capital	2,592,708	2,597,693
Treasury stock, at cost (3,751 shares)	(16,788)	(16,788)
Accumulated other comprehensive loss	(120,463)	(122,863)
Accumulated deficit	(411,000)	(740,837)
Total stockholders’ equity	2,044,747	1,717,496
Total liabilities and stockholders’ equity	$ 5,133,000	$ 5,302,379

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	Mar. 31, 2019	Sep. 30, 2018
Accounts receivable, allowances for doubtful accounts		$ 9,823
Common stock, par value		$ 0.001
Common stock, shares authorized		560,000
Common stock, shares issued		291,504
Common stock, shares outstanding		287,753
Treasury stock, shares		3,751

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Document Period End Date	Mar. 31, 2019
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent	$ (3,050)	$ (119,676)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	83,305	94,245
Stock-based compensation	64,211	67,967
Non-cash interest expense	24,686	25,195
Deferred tax benefit	(12,815)	(90,143)
Loss on extinguishment of debt	910	0
Goodwill and Intangible Asset Impairment	0	137,907
Impairment of fixed asset	0	1,780
Other	805	579
Changes in operating assets and liabilities, excluding effects of acquisitions:
Accounts receivable	24,914	(19,815)
Prepaid expenses and other assets	(20,033)	(22,381)
Accounts payable	3,240	(2,579)
Accrued expenses and other liabilities	(7,985)	4,196
Deferred revenue	41,013	88,460
Net Cash Provided by (Used in) Continuing Operations	199,201	165,735
Cash Provided by (Used in) Operating Activities, Discontinued Operations	4,355	29,630
Net cash provided by operating activities	203,556	195,365
Proceeds from Divestiture of Businesses	404,045	0
Cash flows from investing activities:
Capital expenditures	(23,434)	(25,326)
Payments for business and asset acquisitions, net of cash acquired	(2,553)	(12,768)
Purchases of marketable securities and other investments	(119,165)	(92,994)
Proceeds from sales and maturities of marketable securities and other investments	117,661	195,273
Net cash provided by investing activities	376,554	64,185
Cash flows from financing activities:
Repayment and redemption of debt	(300,000)	(331,172)
Payments for repurchase of common stock	(91,321)	0
Acquisition payments with extended payment terms	0	(16,927)
Proceeds from issuance of common stock from employee stock plans	8,643	9,360
Payments for taxes related to net share settlement of equity awards	(38,191)	(44,006)
Other financing activities	(1,210)	(647)
Net cash used in financing activities	(422,079)	(383,392)
Effects of exchange rate changes on cash and cash equivalents	782	185
Net increase (decrease) in cash and cash equivalents	158,813	(123,657)
Cash and cash equivalents at beginning of period	315,963	592,299
Cash and cash equivalents at end of period	$ 474,776	$ 468,642

Statement of Equity Statement

Statement of Equity Statement - USD ($) shares in Thousands, $ in Thousands	Total	Retained Earnings [Member]	Treasury Stock [Member]	AOCI Attributable to Parent [Member]	Additional Paid-in Capital [Member]	Common Stock [Member]
Shares, Issued			3,751			293,938
Stockholders' Equity Attributable to Parent	$ 1,931,382	$ (580,027)	$ (16,788)	$ (101,342)	$ 2,629,245	$ 294
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income	(882)	(882)
Stock Issued During Period, Shares, Employee Stock Purchase Plans						6,543
Stock Issued During Period, Value, Employee Stock Purchase Plan	9,360				9,354	$ 6
Cancellation of Restricted Stock and Repurchase of Common Stock at Cost for Employee Tax Withholding, Shares						2,151
Cancellation of Restricted Stock and Repurchase of Common Stock at Cost for Employee Tax Withholding, Value	34,507				34,505	$ 2
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition	$ 93,775				93,775
Stock Repurchased and Retired During Period, Shares	5,800
Net income (loss)	$ (110,825)	(110,825)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	5,379			5,379
Shares, Issued			3,751			297,243
Stockholders' Equity Attributable to Parent	2,025,131	(527,681)	$ (16,788)	(99,988)	2,669,291	$ 297
Stock Issued During Period, Shares, Employee Stock Purchase Plans						1,240
Stock Issued During Period, Value, Employee Stock Purchase Plan	9,354				9,353	$ 1
Cancellation of Restricted Stock and Repurchase of Common Stock at Cost for Employee Tax Withholding, Shares						153
Cancellation of Restricted Stock and Repurchase of Common Stock at Cost for Employee Tax Withholding, Value	2,519				2,519	$ 0
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition	21,744				21,744
Net income (loss)	(164,053)	(164,053)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	4,025			4,025
Shares, Issued			3,751			298,330
Stockholders' Equity Attributable to Parent	1,893,682	(691,734)	$ (16,788)	(95,963)	2,697,869	$ 298
Shares, Issued			3,751			291,504
Stockholders' Equity Attributable to Parent	1,717,496	(740,837)	$ (16,788)	(122,863)	2,597,693	$ 291
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income	233,415	233,415
Stock Issued During Period, Shares, Employee Stock Purchase Plans						6,579
Stock Issued During Period, Value, Employee Stock Purchase Plan	8,643				8,636	$ 7
Cancellation of Restricted Stock and Repurchase of Common Stock at Cost for Employee Tax Withholding, Shares						1,982
Cancellation of Restricted Stock and Repurchase of Common Stock at Cost for Employee Tax Withholding, Value	31,560				31,558	$ 2
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition	$ 109,252				109,252
Stock Repurchased and Retired During Period, Shares	6,100					6,063
Stock Repurchased and Retired During Period, Value	$ 91,321				91,315	$ 6
Disposal Group, Including Discontinued Operation, Foreign Currency Translation Gains (Losses)	5,605			5,605
Net income (loss)	96,422
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(3,205)			(3,205)
Shares, Issued			3,751			290,035
Stockholders' Equity Attributable to Parent	1,942,139	(488,332)	$ (16,788)	(131,527)	2,578,496	$ 290
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income	0
Stock Issued During Period, Shares, Employee Stock Purchase Plans						1,426
Stock Issued During Period, Value, Employee Stock Purchase Plan	8,643				8,642	$ 1
Cancellation of Restricted Stock and Repurchase of Common Stock at Cost for Employee Tax Withholding, Shares						252
Cancellation of Restricted Stock and Repurchase of Common Stock at Cost for Employee Tax Withholding, Value	4,040				4,040	$ 0
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition	25,774				25,774
Stock Repurchased and Retired During Period, Shares						1,171
Stock Repurchased and Retired During Period, Value	16,165				16,164	$ 1
Disposal Group, Including Discontinued Operation, Foreign Currency Translation Gains (Losses)	5,605			5,605
Net income (loss)	77,332
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	5,459			5,459
Shares, Issued			3,751			290,038
Stockholders' Equity Attributable to Parent	$ 2,044,747	$ (411,000)	$ (16,788)	$ (120,463)	$ 2,592,708	$ 290

Organization and Presentation

Organization and Presentation	6 Months Ended
	Mar. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Presentation	Organization and Presentation The condensed consolidated financial statements include the accounts of Nuance Communications, Inc. (“Nuance”, “we”, "our", or the "Company") and our wholly-owned subsidiaries. We prepared the unaudited interim condensed consolidated financial statements in accordance with accounting principles generally accepted in the United States of America (the “U.S.” or the "United States") and pursuant to the rules and regulations of the Securities and Exchange Commission (the “SEC”). The condensed consolidated financial statements reflect all normal and recurring adjustments that, in our opinion, are necessary to present fairly our financial position, results of operations and cash flows for the periods presented. The preparation of financial statements in conformity with U.S. Generally Accepted Accounting Principles (“GAAP”) requires management to make estimates and assumptions that affect the reported amounts and classifications of assets and liabilities, disclosure of contingent assets and liabilities, and the reported amounts of revenues and expenses during the reporting period. Although we believe the disclosures included herein are adequate to ensure that the condensed consolidated financial statements are fairly presented, certain information and footnote disclosures to the financial statements have been condensed or omitted in accordance with the rules and regulations of the SEC. Accordingly, the condensed consolidated financial statements and the footnotes included herein should be read in conjunction with the audited financial statements and the footnotes included in our Annual Report on Form 10-K for the fiscal year ended September 30, 2018 . The results of operations for the interim periods presented are not necessarily indicative of the results for the entire fiscal year or any future period.

Summary of Significant Accounti

Summary of Significant Accounting Policies	6 Months Ended
	Mar. 31, 2019
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Recently Adopted Accounting Standards Revenue Recognition In May 2014, the Financial Accounting Standards Board ("FASB") issued ASU No. 2014-09, "Revenue from Contracts with Customers: Topic 606" ("ASC 606"), to supersede nearly all existing revenue recognition guidance under U.S. GAAP. We adopted ASC 606 on October 1, 2018 using the modified retrospective approach, with a cumulative adjustment to retained earnings as opposed to retrospectively adjusting prior periods. Results for reporting periods beginning after October 1, 2018 are presented under ASC 606, while prior period amounts are not adjusted and continue to be reported in accordance with our historic accounting policies ASC 605. For contracts that were modified before the effective date, the Company aggregated the effect of all contract modifications prior to identifying performance obligations and allocating transaction price in accordance with the practical expedient ASC 606-10-65-1-(f)-4. Upon adoption of ASC 606 on October 1, 2018, we recorded a decrease to accumulated deficit of approximately $233 million as a result of the transition. The impact of the adoption primarily relates to the cumulative effect of 1) approximately $70 million decrease in deferred revenue from the upfront recognition of term licenses and the general requirement to allocate the transaction price on a relative stand-alone selling price, 2) approximately $180 million increase in contract assets, 3) approximately $30 million decrease in accounts receivable, 4) approximately $30 million increase in deferred costs, and 5) approximately $20 million increase in deferred tax liabilities related to the above items. The following tables summarize the impact of adopting ASC 606 on the Company’s condensed consolidated statement of operations for the three and six months ended March 31, 2019 and the condensed consolidated balance sheet as of March 31, 2019 (dollars in thousands): For the Three Months Ended March 31, 2019 As reported, ASC 606 Effect of Implementation As adjusted, ASC 605 Revenues: Hosting and professional services $ 251,111 $ 13,200 $ 264,311 Product and licensing 97,543 26,651 124,194 Maintenance and support 60,929 (429 ) 60,500 Total revenues $ 409,583 $ 39,422 $ 449,005 Cost of revenues: Hosting and professional services $ 153,637 $ 685 $ 154,322 Product and licensing 9,940 6,585 16,525 Maintenance and support 8,966 (719 ) 8,247 Amortization of intangible assets 9,048 — 9,048 Total cost of revenues $ 181,591 $ 6,551 $ 188,142 Sales and marketing $ 75,755 $ (2,102 ) $ 73,653 (Benefit) provision for income taxes $ (958 ) $ 11,089 $ 10,131 For the Six Months Ended March 31, 2019 As reported, ASC 606 Effect of Implementation As adjusted, ASC 605 Revenues: Hosting and professional services $ 510,699 $ 21,236 $ 531,935 Product and licensing 255,540 3,923 259,463 Maintenance and support 136,998 (15,759 ) 121,239 Total revenues $ 903,237 $ 9,400 $ 912,637 Cost of revenues: Hosting and professional services $ 316,807 $ (3,253 ) $ 313,554 Product and licensing 42,690 (11,445 ) 31,245 Maintenance and support 16,727 47 16,774 Amortization of intangible assets 18,805 — 18,805 Total cost of revenues $ 395,029 $ (14,651 ) $ 380,378 Sales and marketing $ 151,114 $ (580 ) $ 150,534 Provision for income taxes $ 28 $ 10,679 $ 10,707 As of March 31, 2019 As reported, ASC 606 Effect of Implementation As adjusted, ASC 605 Assets: Accounts receivable $ 292,567 $ 27,293 $ 319,860 Prepaid expenses and other current assets $ 171,717 $ (39,059 ) $ 132,658 Other assets $ 255,928 $ (135,321 ) $ 120,607 Liabilities: Deferred revenue, current $ 300,746 $ 56,065 $ 356,811 Deferred revenue, noncurrent $ 414,437 $ 16,154 $ 430,591 Deferred tax liabilities $ 51,656 $ (9,923 ) $ 41,733 Other long-term liabilities $ 103,214 $ (11,557 ) $ 91,657 Stockholders' Equity: Accumulated deficit $ (411,000 ) $ (198,019 ) $ (609,019 ) Statements of Cash Flows In August 2016, the FASB issued ASU No. 2016-15, "Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments" ("ASU 2016-15"), which is effective for fiscal years beginning after December 15, 2017 and the interim periods therein. We adopted this guidance on October 1, 2018 and applied it retrospectively. The adoption did not have a material impact on our condensed consolidated statements of cash flows. Financial Instruments In January 2016, the FASB issued ASU No. 2016-01, "Recognition and Measurement of Financial Assets and Financial Liabilities" ("ASU 2016-01"). ASU 2016-01 amends the guidance on the classification and measurement of financial instruments. We adopted ASU 2016-01 as of January 1, 2018 using the modified retrospective method. The adoption did not have a material impact on our condensed consolidated financial statements. Issued Accounting Standards Not Yet Adopted Leases In February 2016, the FASB issued ASU No. 2016-02, "Leases" ("ASU 2016-02"). ASU 2016-02 requires lessees to recognize on the balance sheet a right-of-use asset, representing its right to use the underlying asset for the lease term, and a lease liability for all leases with terms greater than 12 months. The guidance also requires qualitative and quantitative disclosures designed to assess the amount, timing, and uncertainty of cash flows arising from leases. The standard requires the use of a modified retrospective transition approach, which includes a number of optional practical expedients that entities may elect to apply. ASU 2016-02 is effective for us in the first quarter of fiscal year 2020, and early application is permitted. In July 2018, the FASB issued ASU 2018-10, Codification Improvements to Topic 842, Leases and ASU 2018-11, Leases Topic 842 Target improvements, which provides an additional (and optional) transition method whereby the new lease standard is applied at the adoption date and recognized as an adjustment to retained earnings. We are currently evaluating the impact of our pending adoption of ASU 2016-02 on our condensed consolidated financial statements, and we currently expect that most of our operating lease commitments will be subject to the new standard and recognized as operating lease liabilities and right-of-use assets upon our adoption of ASU 2016-02, which will increase our total assets and total liabilities that we report relative to such amounts prior to adoption. Other Accounting Pronouncements In August 2018, the FASB issued ASU No. 2018-15, "Intangibles-Goodwill and Other-Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract" ("ASU 2018-15”), which is effective for fiscal year beginning after December 15, 2019, and interim periods within those fiscal years, with early adoption permitted. The guidance requires that implementation costs related to a hosting arrangement that is a service contract be capitalized and amortized over the term of the hosting arrangement, starting when the module or component of the hosting arrangement is ready for its intended use. The guidance will be applied retrospectively to each period presented. We do not expect the implementation to have a material impact on our condensed consolidated financial statements. In January 2018, the FASB issued ASU No. 2018-02, "Income Statement — Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income ("AOCI"), which is effective for fiscal years beginning after December 15, 2018 and interim periods therein, with early adoption permitted. The guidance gives entities the option to reclassify to retained earnings the tax effects resulting from the Tax Cuts and Jobs Act ("TCJA") related to items in AOCI. The new guidance may be applied retrospectively to each period in which the effect of TCJA is recognized in the period of adoption. We do not expect the implementation to have a material impact on our condensed consolidated financial statements.

Revenue Recognition Revenue Re

Revenue Recognition Revenue Recognition (Notes)	6 Months Ended
	Mar. 31, 2019
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer [Text Block]	Revenue Recognition We derive revenue from the following sources: (1) hosting services, (2) software licenses, including royalties, (3) maintenance and support (“M&S”), (4) professional services, and (5) sale of hardware. Revenue is reported net of applicable sales and use tax, value-added tax and other transaction taxes imposed on the related transaction including mandatory government charges that are passed through to our customers. We account for a contract when both parties have approved and committed to the contract, the rights of the parties are identified, payment terms are identified, the contract has commercial substance and collectability of consideration is probable. The majority of our arrangements with customers typically contain multiple products and services. We account for individual products and services separately if they are distinct--that is, if a product or service is separately identifiable from other items in the contract and if a customer can benefit from it on its own or with other resources that are readily available to the customer. We recognize revenue after applying the following five steps: • identification of the contract, or contracts, with a customer; • identification of the performance obligations in the contract, including whether they are distinct within the context of the contract; • determination of the transaction price, including the constraint on variable consideration; • allocation of the transaction price to the performance obligations in the contract; and • recognition of revenue when, or as, performance obligations are satisfied. We allocate the transaction price of the arrangement based on the relative estimated standalone selling price (“SSP”) of each distinct performance obligation. In determining SSP, we maximize observable inputs and consider a number of data points, including: • the pricing of standalone sales (in the instances where available); • the pricing established by management when setting prices for deliverables that are intended to be sold on a standalone basis; • contractually stated prices for deliverables that are intended to be sold on a standalone basis; and • other pricing factors, such as the geographical region in which the products are sold and expected discounts based on the customer size and type. We only include estimated amounts of variable consideration in the transaction price to the extent it is probable that a significant reversal of cumulative revenue recognized will not occur when the uncertainty associated with the variable consideration is resolved. We reduce transaction prices for estimated returns and other allowances that represent variable consideration under ASC 606, which we estimate based on historical return experience and other relevant factors, and record a corresponding refund liability as a component of accrued expenses and other current liabilities. Other forms of contingent revenue or variable consideration are infrequent. Revenue is recognized when control of these products and services is transferred to our customers, in an amount that reflects the consideration we expect to be entitled to in exchange for those services. We assess the timing of the transfer of products or services to the customer as compared to the timing of payments to determine whether a significant financing component exists. In accordance with the practical expedient in ASC 606-10-32-18, we do not assess the existence of a significant financing component when the difference between payment and transfer of deliverables is a year or less. If the difference in timing arises for reasons other than the provision of finance to either the customer or us, no financing component is deemed to exist. The primary purpose of our invoicing terms is to provide customers with simplified and predictable ways of purchasing our services, not to receive or provide financing from or to customers. We do not consider set-up fees nor other upfront fees paid by our customers to represent a financing component. Certain products are sold through distributors or resellers. Certain distributors and resellers have been granted right of return and selling incentives which are accounted for as variable consideration when estimating the amount of revenue to be recognized. Returns and credits are estimated at the contract inception and updated at the end of each reporting period as additional information becomes available. In accordance with the practical expedient in ASC 606-10-10-4, we apply a portfolio approach to estimate the variable consideration associated with this group of customers. Reimbursements for out-of-pocket costs generally include, but are not limited to, costs related to transportation, lodging and meals. Revenue from reimbursed out-of-pocket costs is accounted for as variable consideration. Shipping and handling activities are not considered a contract performance obligation. We record shipping and handling costs billed to customers as revenue with offsetting costs recorded as cost of revenue. Performance Obligations Hosting Hosting services, which allow our customers to use the hosted software over the contract period without taking possession of the software, are provided on a usage basis as consumed or on a fixed fee subscription basis. Our hosting contract terms generally range from one to five years. As each day of providing services is substantially the same and the customer simultaneously receives and consumes the benefits as access is provided, we have determined that our hosting services arrangements are a single performance obligation comprised of a series of distinct services. These services include variable consideration, typically a function of usage. We recognize revenue as each distinct service period is performed (i.e., recognized as incurred). Subscription basis revenue represents a single promise to stand-ready to provide access to our hosting services. Revenue is recognized over time on a ratable basis over the hosting contract term, which generally ranges from one to five years. Software Licenses On-premise software licenses sold with non-distinct professional services to customize and/or integrate the underlying software are accounted for as a combined performance obligation. Revenue from the combined performance obligation is recognized over time based upon the progress towards completion of the project, which is measured based on the labor hours already incurred to date as compared to the total estimated labor hours. Revenue from distinct on-premise software licenses, which do not require professional services to customize and/or integrate the software license, is recognized at the point in time when the software is made available to the customer and control is transferred. Revenue from software license sold on a royalty basis, where the license of intellectual property is the predominant item to which the royalty relates, is recognized in the period the usage occurs in accordance with the practical expedient in ASC 606-10-55-65(A). Maintenance and Support Our M&S contracts generally include telephone support and the right to receive unspecified upgrades and updates on a when-and-if available basis. M&S revenue is recognized over time on ratable basis over the contract period because we transfer control evenly by providing a stand-ready service. Professional Services Revenue from distinct professional services, including training, is recognized over time based upon the progress towards completion of the project, which is measured based on the labor hours already incurred to date as compared to the total estimated labor hours. Hardware Hardware revenue is recognized point in time when control is transferred to the customer, typically delivery. Significant Judgments Determining whether products and services are considered distinct performance obligations that should be accounted for separately versus together may require significant judgment. Our license contracts often include professional services to customize and/or integrate the licenses into the customer’s environment. Judgment is required to determine whether the license is considered distinct and accounted for separately, or not distinct and accounted for together with professional services. Judgments are required to determine the SSP for each distinct performance obligation. When SSP is directly observable, we estimate SSP based upon the historical transaction prices, adjusted for geographic considerations, customer classes, and customer relationship profiles. In instances where SSP is not directly observable, we determine SSP using information that may include market conditions and other observable inputs. We may have more than one SSP for individual products and services due to the stratification of those products and services by customers and circumstances. In these instances, we may use information such as the size of the customer and geographic region in determining SSP. Determining SSP for performance obligations which we never sell separately also requires significant judgment. In estimating the SSP, we consider the likely price that would have resulted from established pricing practices had the deliverable been offered separately and the prices a customer would likely be willing to pay. From time to time, we may enter into arrangements with third party suppliers to resell products or services. In such cases, we evaluate whether we are the principal (i.e. report revenues on a gross basis) or agent (i.e. report revenues on a net basis). In doing so, we first evaluate whether we control the good or service before it is transferred to the customer. If we control the good or service before it is transferred to the customer, we are the principal; if not, we are the agent. Generally, we control a promised good or service before transferring that good or service to the customer and act as the principal to the transaction. Determining whether we control the good or service before it is transferred to the customer may require judgment. Disaggregated Revenue We disaggregate revenue from contracts with customers by reportable segment and products and services as this presentation depicts the timing, risks and uncertainty of our revenue streams, which is also in line with how we manage our businesses, assess performance, and determine management compensation. Our disaggregated revenue from continuing operations is as follows (dollars in thousands): For the Three Months Ended March 31, 2019 Hosting and professional services Product and licensing Maintenance and support Total Healthcare $ 125,867 $ 41,708 $ 36,829 $ 204,404 Enterprise 76,674 14,774 23,994 115,442 Automotive 33,584 39,317 98 72,999 Other 14,986 1,744 8 16,738 Total revenues $ 251,111 $ 97,543 $ 60,929 $ 409,583 For the Six Months Ended March 31, 2019 Hosting and professional services Product and licensing Maintenance and support Total Healthcare $ 259,382 $ 134,737 $ 82,150 $ 476,269 Enterprise 155,216 35,053 54,625 244,894 Automotive 65,455 81,425 98 146,978 Other 30,646 4,325 125 35,096 Total revenues $ 510,699 $ 255,540 $ 136,998 $ 903,237 Hardware comprised approximately $7.1 million of total product and license revenue for the three months ended March 31, 2019 and $17.2 million for the six months ended March 31, 2019 . Contract Acquisition Costs In conjunction with the adoption of ASC 606, we are required to capitalize certain contract acquisition costs. The capitalized costs primarily relate to paid commissions and other direct, incremental cost to acquire customer contracts. In accordance with the practical expedient in ASC 606-10-10-4, we apply a portfolio approach to estimate contract acquisition costs for groups of customer contracts. We elect to apply the practical expedient in ASC 340-40-25-4 and will expense contract acquisition costs as incurred where the expected period of benefit is one year or less. Sales commissions paid on renewal maintenance and support are not commensurate with sales commissions paid on the initial maintenance and support contract. Contract acquisition costs are deferred and amortized on a straight-line basis over the period of benefit, which we have estimated to be between one and five years. The period of benefit was determined based on an average customer contract term, expected contract renewals, changes in technology and our ability to retain customers including canceled contracts. Contract acquisition costs are classified as current or noncurrent assets based on when the expense will be recognized. The current and noncurrent portions of contract acquisition costs are included in Prepaid expenses and other current assets, and Other assets, respectively. As of March 31, 2019 , we had $17.7 million of current contract acquisition costs and $27.8 million of noncurrent contract acquisition costs. Commission expense is primarily included in Sales and marketing expense on the condensed consolidated statements of operations. We had amortization expense of $3.7 million related to contract acquisition costs for the three months ended March 31, 2019 and $7.2 million for the six months ended March 31, 2019 . There was no impairment related to commission costs capitalized. Contract Fulfillment Costs We capitalize the setup costs incurred to satisfy our stand-ready obligation to provide access to our hosting service. Contract fulfillment costs are expensed to cost of revenue as we satisfy our stand-ready obligation over the contract term which we estimate to be between one and five years. The contract term was determined based on an average customer contract term, expected contract renewals, changes in technology, and our ability to retain customers including canceled contracts. We classify contract fulfillment costs as current or noncurrent based on the timing of when we expect to recognize the expense. The current and noncurrent portions of capitalized contract fulfillment costs are included in Prepaid expenses and other current assets, and Other assets, respectively. At March 31, 2019 , we had $13.4 million of short-term contract fulfillment costs included with Prepaid expenses and other current assets and $96.2 million of long-term costs included within Other assets. Trade Accounts Receivable and Contract Balances We classify our right to consideration in exchange for deliverables as either a receivable or a contract asset. A receivable is a right to consideration that is unconditional (i.e. only the passage of time is required before payment is due). We present such receivables in Accounts receivable, net in our condensed consolidated balance sheets at their net estimated realizable value. We maintain an allowance for doubtful accounts to provide for the estimated amount of receivables that may not be collected. The allowance is based upon an assessment of customer creditworthiness, historical payment experience, the age of outstanding receivables and other applicable factors. Our contract assets and liabilities are reported in a net position on a contract-by-contract basis at the end of each reporting period. Contract assets include unbilled amounts from long-term contracts when revenue recognized exceeds the amount billed to the customer, and right to payment is not solely subject to the passage of time. The current and noncurrent portions of contract assets are included in Prepaid expenses and other current assets and Other assets. As of March 31, 2019 , we had $59.8 million of current contract assets and $100.8 million of noncurrent contract assets. The table below shows significant changes in contract assets of continuing operations (dollars in thousands): Contract assets Balance as of October 1, 2018 $ 168,595 Revenues recognized but not billed 156,541 Amounts reclassified to accounts receivable (164,483 ) Balance at March 31, 2019 $ 160,653 Our contract liabilities, or deferred revenue, consist of advance payments and billings in excess of revenues recognized. We classify deferred revenue as current or noncurrent based on when we expect to recognize the revenues. At March 31, 2019 , we had $715.2 million of deferred revenue. The table below shows significant changes in deferred revenue of continuing operations (dollars in thousands): Deferred revenue Balance as of October 1, 2018 $ 693,272 Amounts bill but not recognized 506,225 Revenue recognized (484,314 ) Balance at March 31, 2019 $ 715,183 Remaining Performance Obligations The following table includes estimated revenue expected to be recognized in the future related to performance obligations that are unsatisfied or partially unsatisfied at March 31, 2019 (dollars in thousands): Within One Year Two to Five Years Greater than Five years Total Total revenue $ 748,526 $ 1,138,447 $ 112,907 $ 1,999,880 The table above includes fixed backlogs and does not include variable backlog derived from continent usage-based activities, such as royalties and usage-based hosting revenue.

Disposition of Business (Notes)

Disposition of Business (Notes)	6 Months Ended
	Mar. 31, 2019
Discontinued Operations and Disposal Groups [Abstract]
Disposal Groups, Including Discontinued Operations, Disclosure [Text Block]	Disposition of Businesses On November 7, 2018, our Board of Directors approved the divestiture of our Imaging business. On November 11, 2018, we entered into a sale agreement (the “Agreement”) with Project Leopard AcquireCo Limited, a private limited company incorporated under the laws of England and Wales (and an affiliate of Kofax, Inc.) (the “Buyer”), relating to the sale of our Imaging business for a total cash consideration of approximately $400 million , subject to certain customary post-closing adjustments as set forth in the Agreement. Pursuant to the Agreement, we sold and transferred, and Buyer purchased and acquired, (a) the shares of certain subsidiaries through which we operate a portion of our Imaging business and (b) certain assets used in or related to the business; and the Buyer assumed certain liabilities related to such assets or the business, subject to certain exclusions and indemnities as set forth in the Agreement. On February 1, 2019 , we completed the sale of our Imaging business and received approximately $404.0 million in cash, after estimated transaction expenses, and subject to post-closing finalization of the adjustments set forth in the Agreement. As a result, we recorded a gain of approximately $102.4 million , which is included within Net income from discontinued operations. There are a number of working capital and other adjustments under the Agreement and related ancillary agreements. We do not believe that post-closing working capital adjustments under the Agreement, if any, will have a material impact on our results of operations. For all periods presented, Imaging's results of operations have been included within discontinued operations and its assets and liabilities within held for sale in our condensed consolidated financial statements. The following table summarizes the results of the discontinued operations (dollars in thousands): Disposition of Businesses On November 7, 2018, our Board of Directors approved the divestiture of our Imaging business. On November 11, 2018, we entered into a sale agreement (the “Agreement”) with Project Leopard AcquireCo Limited, a private limited company incorporated under the laws of England and Wales (and an affiliate of Kofax, Inc.) (the “Buyer”), relating to the sale of our Imaging business for a total cash consideration of approximately $400 million , subject to certain customary post-closing adjustments as set forth in the Agreement. Pursuant to the Agreement, we sold and transferred, and Buyer purchased and acquired, (a) the shares of certain subsidiaries through which we operate a portion of our Imaging business and (b) certain assets used in or related to the business; and the Buyer assumed certain liabilities related to such assets or the business, subject to certain exclusions and indemnities as set forth in the Agreement. On February 1, 2019 , we completed the sale of our Imaging business and received approximately $404.0 million in cash, after estimated transaction expenses, and subject to post-closing finalization of the adjustments set forth in the Agreement. As a result, we recorded a gain of approximately $102.4 million , which is included within Net income from discontinued operations. There are a number of working capital and other adjustments under the Agreement and related ancillary agreements. We do not believe that post-closing working capital adjustments under the Agreement, if any, will have a material impact on our results of operations. For all periods presented, Imaging's results of operations have been included within discontinued operations and its assets and liabilities within held for sale in our condensed consolidated financial statements. The following table summarizes the results of the discontinued operations (dollars in thousands): Three Months Ended March 31, Six Months Ended March 31, 2019 2018 2019 2018 (ASC 606) (ASC 605) (ASC 606) (ASC 605) Major line items constituting net income of Imaging: Revenue (a) $ 15,435 $ 48,031 $ 67,430 $ 102,452 Cost of revenue 4,942 11,968 16,946 24,924 Research and development 2,041 7,487 7,557 14,767 Sales and marketing (a) 10,243 19,330 28,433 40,730 General and administrative 766 1,105 1,997 2,224 Amortization of intangible assets 1,305 4,273 5,219 8,496 Acquisition-related costs, net — — (386 ) — Restructuring and other charges, net 4,791 67 13,251 1,299 Other — 162 — 162 (Loss) income from discontinued operations before income taxes (a) (8,653 ) 3,639 (5,587 ) 9,850 (Benefit) provision for income taxes (4,363 ) 551 (2,688 ) 999 Gain on disposition 102,371 — 102,371 — Net income from discontinued operations $ 98,081 $ 3,088 $ 99,472 $ 8,851 Supplemental information: Depreciation $ 97 $ 333 $ 391 $ 750 Amortization $ 1,643 $ 5,995 $ 6,569 $ 12,060 Stock compensation $ 5,001 $ 2,007 $ 7,103 $ 3,768 Capital expenditures for all periods presented were de minimis. (a) As more fully described in Note 2, as a result of the adoption of ASC 606 using the modified retrospective approach, revenue for the three and six months ended March 31, 2019 reflects an increase of $0.8 million and $2.4 million , respectively, due to the upfront recognition of term licenses and the re-allocation of contract consideration to performance obligations based upon standalone selling prices; sales and marketing expense for the three and six months ended March 31, 2019 reflects a decrease of $0.1 million and $1.4 million , respectively, due to the capitalization and amortization of commission expense; and the provision for income taxes for the three and six months ended March 31, 2019 reflects an increase in tax benefit of $2.7 million and $1.6 million , respectively, related to the tax effect of the ASC 606 adjustments. The following table summarizes the assets and liabilities included within discontinued operations (dollars in thousands): September 30, (ASC 605) Major classes of Imaging assets: Accounts receivable, net $ 30,959 Prepaid expenses and other current assets 3,443 Land, building and equipment, net 2,442 Goodwill 257,352 Intangible assets, net 99,507 Other assets 196 Total assets classified as held for sale $ 393,899 Major classes of Imaging liabilities: Accounts payable $ 3,604 Accrued expenses and other current liabilities 12,304 Deferred revenue 107,965 Other liabilities 2,658 Total liabilities classified as held for sale $ 126,531 Additionally, on November 19, 2018, we announced our intent to spin off our Automotive business into an independent publicly traded company through a pro rata distribution to our common stock holders. Completion of the proposed spin-off is subject to certain conditions, including final approval by our Board of Directors. We intend to complete the separation of the business by the beginning of fiscal year 2020.

Business Acquisitions

Business Acquisitions	6 Months Ended
	Mar. 31, 2019
Business Combinations [Abstract]
Business Acquisitions	Business Acquisitions We continue to expand our solutions and integrate our technologies in new offerings through acquisitions. A summary of our acquisition activities is as follows: Fiscal Year 2018 For the six months ended March 31, 2018 , we completed an acquisition in our Healthcare segment for total cash consideration of $8.7 million and contingent payments with a fair value of $0.5 million . As a result, we recognized goodwill of $6.8 million and other intangible assets of $2.0 million , with a weighted average life of 2.0 years . The acquisition does not have a material impact on our condensed consolidated financial statements for the periods presented. Acquisition-Related Costs, net Acquisition-related costs include costs related to business and asset acquisitions. These costs consist of (i) transition and integration costs, including retention payments, transitional employee costs and earn-out payments, and other costs related to integration activities; (ii) professional service fees, including financial advisory, legal, accounting, and other outside services incurred in connection with acquisition activities, and disputes and regulatory matters related to acquired entities; and (iii) fair value adjustments to acquisition-related contingencies. A summary of acquisition-related costs, net is as follows (dollars in thousands): Three Months Ended March 31, Six Months Ended March 31, 2019 2018 2019 2018 Transition and integration costs $ 2,228 $ 3,367 $ 5,092 $ 7,429 Professional service fees 378 940 456 1,451 Acquisition-related adjustments (373 ) (1,947 ) (479 ) (959 ) Total $ 2,233 $ 2,360 $ 5,069 $ 7,921

Goodwill and Intangible Assets

Goodwill and Intangible Assets	6 Months Ended
	Mar. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	Goodwill and Intangible Assets The changes in the carrying amount of goodwill by reportable segment for the six months ended March 31, 2019 are as follows (dollars in thousands): Goodwill Healthcare Enterprise Automotive Other Total Balance as of September 30, 2018 $ 1,430,325 $ 683,347 $ 1,119,947 $ 13,486 $ 3,247,105 Purchase accounting adjustments 88 — (355 ) — (267 ) Effect of foreign currency translation (2,448 ) (2,406 ) (3,139 ) (435 ) (8,428 ) Balance at March 31, 2019 $ 1,427,965 $ 680,941 $ 1,116,453 $ 13,051 $ 3,238,410 Other Intangible Assets The changes in the carrying amount of intangible assets for the six months ended March 31, 2019 are as follows (dollars in thousands): Intangible Assets Balance as of September 30, 2018 $ 450,001 Acquisitions 1,488 Amortization (52,735 ) Effect of foreign currency translation (442 ) Balance at March 31, 2019 $ 398,312 Fiscal Year 2018 Interim Impairment Analysis Effective the second quarter of fiscal year 2018, our Automotive business, which was previously included within our Mobile segment, became a standalone operating segment. As a result of the reorganization, the original Mobile reporting unit was separated into three discrete lines of business comprised of Automotive, Dragon TV, and Devices. Dragon TV was merged within our Enterprise segment, and Devices was included within Other segment. We assigned $1,080.5 million , $12.0 million , and $36.0 million of goodwill to Automotive, Dragon TV and Devices, respectively, based on their relative fair values as of March 31, 2018, and assessed the assigned goodwill for impairment by comparing each component’s fair value to its carrying amount. As a result, we recorded a goodwill impairment charge of $35.1 million related to Devices for the second quarter of fiscal 2018. Also during the second quarter of fiscal 2018, our Subscriber Revenue Services ("SRS") reporting unit, originally included within our Mobile operating segment, recorded significantly lower revenue and profitability due to recent market disruptions in certain markets that we serve. We concluded that these financial results coupled with the rapid market shifts being experienced in the industry were factors that represented impairment indicators, triggering a review of goodwill and indefinite-lived intangible assets for impairment during the second quarter of fiscal 2018. Based on the result of the impairment assessment, the carrying value of SRS exceeded its fair value by $94.3 million . In addition, we recorded an $8.5 million deferred tax benefit related to SRS’s goodwill, which is amortized over time for tax purposes, and therefore increased the impairment charge by the same amount. As a result, we recorded a goodwill impairment charge of $102.8 million related to SRS for the second quarter of fiscal 2018. After the impairment charge, goodwill assigned to SRS was $17.8 million as of March 31, 2018. The assessment did not result in any impairment charge of other intangible assets. Wind-down of Devices and Mobile Operator Services and Annual Goodwill Impairment Analysis During the fourth quarter of fiscal 2018, in connection with our strategic business review announced in our earnings release issued on May 9, 2018, we restructured our SRS business by separating the voicemail transcription services business (“Voice-to-Text”), which will continue to operate as part of the Other Segment, and commenced a wind-down of our SRS Mobile Operator Services in India and Brazil, and our Devices businesses. The SRS business provides value-added services to mobile operators in India and Brazil ("Mobile Operator Services"). As a result, we revised our multi-year operating plans of Mobile Operator Services and Devices businesses, as part of our fiscal 2019 budgeting process, to reflect a significant decline in revenue and operating income. The wind-down decision has resulted in significantly lower estimated future cash flows over a considerably shorter time horizon, which triggered a review of goodwill and long-lived asset groups for impairment. As a result of the impairment review, we recorded an additional $15.0 million impairment charge for Devices for the fourth quarter of fiscal year 2018, including $7.6 million related to acquired trade names and customer relationships, $0.8 million related to acquired technology assets, $6.2 million related to fixed assets, and $0.4 million related to its remaining goodwill; we also recorded $25.1 million impairment charge for our Mobile Operator Services business for the fourth quarter of fiscal year 2018, including $12.9 million related to acquired trade names and customer relationships, $7.9 million related to acquired technology assets, $0.9 million related to fixed assets, and $3.4 million related to goodwill.

Financial Instruments and Hedgi

Financial Instruments and Hedging Activities	6 Months Ended
	Mar. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Financial Instruments and Hedging Activities	Financial Instruments and Hedging Activities Derivatives Not Designated as Hedges Forward Currency Contracts We utilize foreign currency forward contracts to mitigate the risks associated with changes in foreign currency exchange rates. Generally, we enter into such contracts for less than 90 days and have no cash requirements until maturity. At March 31, 2019 and September 30, 2018 , we had outstanding contracts with a total notional value of $43.6 million and $117.1 million , respectively. We did not designate any forward contracts as hedging instruments for the six months ended March 31, 2019 or 2018 . Therefore, changes in fair value of foreign currency forward contracts were recognized within Other income (expense), net in our condensed consolidated statements of operations. The cash flows related to the settlement of forward contracts not designated as hedging instruments are included in cash flows from investing activities within our condensed consolidated statement of cash flows. A summary of the derivative instruments is as follows (dollars in thousands): Derivatives Not Designated as Hedges Balance Sheet Classification Fair Value March 31, September 30, Foreign currency forward contracts Prepaid expenses and other current assets $ 689 $ 143 Foreign currency forward contracts Accrued expenses and other current liabilities (350 ) (1,192 ) A summary of income (loss) related to the derivative instruments for the three and six months ended March 31, 2019 and 2018 is as follows (dollars in thousands): Income Statement Classification Three Months Ended March 31, Six Months Ended March 31, Derivatives Not Designated as Hedges Income (loss) recognized 2019 2018 2019 2018 Foreign currency forward contracts Other income (expense), net $ 2,170 $ (785 ) $ 440 $ (1,182 )

Fair Value Measures

Fair Value Measures	6 Months Ended
	Mar. 31, 2019
Fair Value Disclosures [Abstract]
Fair Value Measures	Fair Value Measurements Fair value is defined as the price that would be received to sell an asset, or paid to transfer a liability, in an orderly transaction between market participants at the measurement date. Valuation techniques must maximize the use of observable inputs and minimize the use of unobservable inputs. When determining the fair value measurements for assets and liabilities required to be recorded at fair value, we consider the principal or most advantageous market in which we would transact and consider assumptions that market participants would use when pricing the asset or liability, such as inherent risk, transfer restrictions, and risk of nonperformance. The determination of the applicable level within the hierarchy of a particular financial asset or liability depends on the lowest level of inputs that are significant to the fair value measurement as of the measurement date as follows: • Level 1: Quoted prices for identical assets or liabilities in active markets. • Level 2: Observable inputs other than those described as Level 1. • Level 3: Unobservable inputs that are supportable by little or no market activities and are based on significant assumptions and estimates. Assets and liabilities measured at fair value on a recurring basis at March 31, 2019 and September 30, 2018 consisted of the following (dollars in thousands): March 31, 2019 Level 1 Level 2 Level 3 Total Assets: Money market funds (a) $ 380,124 $ — $ — $ 380,124 Time deposits (b) — 97,225 — 97,225 Commercial paper, $37,852 at cost (b) — 38,061 — 38,061 Corporate notes and bonds, $46,694 at cost (b) — 46,686 — 46,686 Foreign currency exchange contracts (b) — 689 — 689 Total assets at fair value $ 380,124 $ 182,661 $ — $ 562,785 Liabilities: Foreign currency exchange contracts (b) $ — $ (350 ) $ — $ (350 ) Contingent acquisition payments (c) — — (1,450 ) (1,450 ) Total liabilities at fair value $ — $ (350 ) $ (1,450 ) $ (1,800 ) September 30, 2018 Level 1 Level 2 Level 3 Total Assets: Money market funds (a) $ 200,004 $ — $ — $ 200,004 Time deposits (b) — 88,158 — 88,158 Commercial paper, $27,194 at cost (b) — 27,363 — 27,363 Corporate notes and bonds, $57,563 at cost (b) — 57,417 — 57,417 Foreign currency exchange contracts (b) — 143 — 143 Total assets at fair value $ 200,004 $ 173,081 $ — $ 373,085 Liabilities: Foreign currency exchange contracts (b) $ — $ (1,192 ) $ — $ (1,192 ) Contingent acquisition payments (c) — — (4,000 ) (4,000 ) Total liabilities at fair value $ — $ (1,192 ) $ (4,000 ) $ (5,192 ) (a) Money market funds and time deposits with original maturity of 90 days or less are included within cash and cash equivalents in the consolidated balance sheets and are valued at quoted market prices in active markets. (b) Time deposits, commercial paper, corporate notes and bonds, and foreign currency exchange contracts are recorded at fair market values, which are determined based on the most recent observable inputs for similar instruments in active markets or quoted prices for identical or similar instruments in markets that are not active or are directly or indirectly observable. Time deposits are generally for terms of one year or less. Commercial paper and corporate notes and bonds generally mature within three years and had a weighted average maturity of 0.59 years as of March 31, 2019 and 0.61 years as of September 30, 2018 . (c) The fair values of our contingent consideration arrangements were determined using either the option pricing model with Monte Carlo simulation or the probability-weighted discounted cash flow method. The estimated fair value of our long-term debt was approximately $2,114.3 million (face value $2,137.0 million ) as of March 31, 2019 and $2,423.6 million (face value $2,437.0 million ) as of September 30, 2018 based on Level 2 measurements. The fair value of each borrowing was estimated using the average of the bid and ask trading quotes at each respective reporting date. There was no balance outstanding under our revolving credit agreement as of March 31, 2019 or September 30, 2018 . Additionally, contingent acquisition payments are recorded at fair values upon the acquisition, and remeasured in subsequent reporting periods with the changes in fair values recorded within acquisition-related costs, net. Such payments are contingent upon the achievement of specified performance targets and are valued using the option pricing model with Monte Carlo simulation or the probability-weighted discounted cash flow model. The following table provides a summary of changes in the aggregate fair value of the contingent acquisition payments for all periods presented (dollars in thousands): Three Months Ended March 31, Six Months Ended March 31, 2019 2018 2019 2018 Balance at beginning of period $ 3,979 $ 10,431 $ 4,000 $ 8,648 Earn-out liabilities established at time of acquisition — — — 500 Payments and foreign currency translation (2,529 ) (79 ) (2,550 ) (96 ) Adjustments to fair value included in acquisition-related costs, net — 1,400 — 2,700 Balance at end of period $ 1,450 $ 11,752 $ 1,450 $ 11,752 Contingent acquisition payments are to be made in periods through fiscal year 2021 . As of March 31, 2019 , the maximum amount payable based on the agreements was $9.2 million if the specified performance targets are achieved.

Accrued Expenses and Other Curr

Accrued Expenses and Other Current Liabilities	6 Months Ended
	Mar. 31, 2019
Payables and Accruals [Abstract]
Accrued Expenses and Other Current Liabilities	Accrued Expenses and Other Current Liabilities Accrued expenses and other current liabilities consisted of the following (dollars in thousands): March 31, September 30, Compensation $ 105,664 $ 174,984 Cost of revenue related liabilities 42,355 30,432 Consulting and professional fees 17,847 21,220 Accrued interest payable 19,304 21,326 Sales and other taxes payable 5,483 5,983 Facility-related liabilities 4,378 4,621 Sales and marketing incentives 2,434 1,889 Other 14,006 8,884 Total $ 211,471 $ 269,339

Restructuring and Other Charges

Restructuring and Other Charges, net	6 Months Ended
	Mar. 31, 2019
Restructuring and Related Activities [Abstract]
Restructuring and Related Activities Disclosure [Text Block]	Restructuring and Other Charges, net Restructuring and other charges, net include restructuring expenses together with other charges that are unusual in nature, are the result of unplanned events, or arise outside of the ordinary course of our business. The following table sets forth accrual activities relating to restructuring reserves for the six months ended March 31, 2019 (dollars in thousands): Personnel Facilities Total Balance at September 30, 2018 $ 9,690 $ 6,503 $ 16,193 Restructuring charges, net 18,428 2,151 20,579 Non-cash adjustment — 504 504 Cash payments (18,042 ) (4,643 ) (22,685 ) Balance at March 31, 2019 $ 10,076 $ 4,515 $ 14,591 While restructuring and other charges, net are excluded from our calculation of segment profit, the table below presents the restructuring and other charges, net associated with each segment (dollars in thousands): Three Months Ended March 31, 2019 2018 Personnel Facilities Total Restructuring Other Charges Total Personnel Facilities Total Restructuring Other Charges Total Healthcare $ 2,971 $ 14 $ 2,985 $ — $ 2,985 $ 788 $ — $ 788 $ — $ 788 Enterprise 2,700 — 2,700 — 2,700 265 7 272 — 272 Automotive 3,593 (381 ) 3,212 8,399 11,611 849 — 849 — 849 Other (116 ) — (116 ) 561 445 1,095 558 1,653 — 1,653 Corporate 797 612 1,409 2,319 3,728 707 798 1,505 3,814 5,319 Total $ 9,945 $ 245 $ 10,190 $ 11,279 $ 21,469 $ 3,704 $ 1,363 $ 5,067 $ 3,814 $ 8,881 Six Months Ended March 31, 2019 2018 Personnel Facilities Total Restructuring Other Charges Total Personnel Facilities Total Restructuring Other Charges Total Healthcare $ 4,450 $ 141 $ 4,591 $ — $ 4,591 $ 3,301 $ 25 $ 3,326 $ — $ 3,326 Enterprise 5,251 13 5,264 — 5,264 527 2,367 2,894 — 2,894 Automotive 5,863 1,675 7,538 12,513 20,051 1,000 — 1,000 — 1,000 Other 914 — 914 3,067 3,981 1,344 569 1,913 — 1,913 Corporate 1,950 322 2,272 8,391 10,663 1,192 58 1,250 12,067 13,317 Total $ 18,428 $ 2,151 $ 20,579 $ 23,971 $ 44,550 $ 7,364 $ 3,019 $ 10,383 $ 12,067 $ 22,450 Fiscal Year 2019 For the six months ended March 31, 2019 , we recorded restructuring charges of $20.6 million , which included $18.4 million related to the termination of approximately 360 employees and $2.2 million related to certain excess facilities. Of these amounts, $10.2 million was recorded for the three months ended March 31, 2019 , which included $9.9 million related to employee termination and $0.2 million related to certain excess facilities. These actions were part of our strategic initiatives focused on investment rationalization, process optimization and cost reduction. We expect the remaining outstanding severance of $10.1 million to be substantially paid during fiscal year 2019 , and the remaining balance of $4.5 million related to excess facilities to be paid through fiscal year 2027 , in accordance with the terms of the applicable leases. Additionally, for the six months ended March 31, 2019 , we recorded $8.7 million of professional services fees related to our corporate transformational efforts, $12.5 million costs related to the separation and stand-up of our Imaging and Automotive businesses, and $3.1 million accelerated depreciation related to our Mobile Operator Services, offset in part by a $0.3 million cash receipt from insurance claims related to the malware incident that occurred in the third quarter of fiscal year 2017 (the "2017 Malware Incident"). Of these amounts, we recorded $1.5 million of professional services fees related to our corporate transformational efforts, $8.3 million costs related to the separation and stand-up of our Imaging and Automotive businesses, $0.6 million accelerated depreciation related to our Mobile Operator Services, and $0.8 million related to the 2017 Malware Incident for the three months ended March 31, 2019 . Fiscal Year 2018 For the six months ended March 31, 2018 , we recorded restructuring charges of $10.4 million , which included $7.4 million related to the termination of approximately 160 employees and $3.0 million related to certain excess facilities. Of these amount, $5.1 million was recorded for the three months ended March 31, 2018 , which included $3.7 million related to employee termination and $1.4 million related to certain excess facilities. These actions were part of our initiatives to reduce costs and optimize processes. Additionally, for the six months ended March 31, 2018 , we recorded $5.7 million related to the transition agreement of our former CEO, and $7.2 million related to our remediation and restoration efforts after the 2017 Malware Incident. Of these amounts, $2.3 million related to the CEO transition and $1.5 million related to the 2017 Malware Incident were recorded for the three months ended March 31, 2018 .

Debt and Credit Facilities

Debt and Credit Facilities	6 Months Ended
	Mar. 31, 2019
Debt Disclosure [Abstract]
Debt and Credit Facilities	Debt As of March 31, 2019 and September 30, 2018 , we had the following borrowing obligations (dollars in thousands): March 31, September 30, 5.625% Senior Notes due 2026, net of deferred issuance costs of $4.8 million and $5.1 million, respectively. Effective interest rate 5.625%. $ 495,210 $ 494,915 5.375% Senior Notes due 2020, net of deferred issuance costs of $1.2 million, respectively. Effective interest rate 5.375%. — 298,759 6.000% Senior Notes due 2024, net of deferred issuance costs of $1.6 million and $1.8 million, respectively. Effective interest rate 6.000%. 298,375 298,220 1.00% Convertible Debentures due 2035, net of unamortized discount of $104.4 million and $116.9 million, respectively, and deferred issuance costs of $4.9 million and $5.6 million, respectively. Effective interest rate 5.622%. 567,128 553,973 2.75% Convertible Debentures due 2031. Effective interest rate 7.432%. 46,568 46,568 1.25% Convertible Debentures due 2025, net of unamortized discount of $77.1 million and $82.4 million, respectively, and deferred issuance costs of $3.4 million and $3.7 million, respectively. Effective interest rate 5.578%. 269,485 263,863 1.50% Convertible Debentures due 2035, net of unamortized discount of $27.8 million and $32.8 million, respectively, and deferred issuance costs of $1.0 million and $1.1 million, respectively. Effective interest rate 5.394%. 235,096 229,906 Deferred issuance costs related to our Revolving Credit Facility (677 ) (843 ) Total debt 1,911,185 2,185,361 Less: current portion — — Total long-term debt $ 1,911,185 $ 2,185,361 The following table summarizes the maturities of our borrowing obligations as of March 31, 2019 (dollars in thousands): Fiscal Year Convertible Debentures (1) Senior Notes Total 2019 $ — $ — $ — 2020 — — — 2021 — — — 2022 310,463 — 310,463 2023 676,488 — 676,488 Thereafter 350,000 800,000 1,150,000 Total before unamortized discount 1,336,951 800,000 2,136,951 Less: unamortized discount and issuance costs (218,674 ) (7,092 ) (225,766 ) Total long-term debt $ 1,118,277 $ 792,908 $ 1,911,185 (1) Pursuant to the terms of each convertible instrument, holders have the right to redeem the debt on specific dates prior to maturity. The repayment schedule above assumes that payment is due on the next redemption date after March 31, 2019 . 5.625% Senior Notes due 2026 In December 2016 , we issued $500.0 million aggregate principal amount of 5.625% Senior Notes due on December 15, 2026 (the "2026 Senior Notes") in a private placement. The proceeds from the 2026 Senior Notes were approximately $495.0 million , net of issuance costs, and we used the proceeds to repurchase a portion of our 2020 Senior Notes. The 2026 Senior Notes bear interest at 5.625% per year, payable in cash semi-annually in arrears, beginning on June 15, 2017. The 2026 Senior Notes are unsecured senior obligations and are guaranteed on an unsecured senior basis by certain of our domestic subsidiaries ("Subsidiary Guarantors"). The 2026 Senior Notes and the guarantees rank equally in right of payment with all of our and the Subsidiary Guarantors’ existing and future unsecured senior debt and rank senior in right of payment to all of our and the Subsidiary Guarantors’ future unsecured subordinated debt. The 2026 Senior Notes and guarantees effectively rank junior to all our secured debt and that of the Subsidiary Guarantors to the extent of the value of the collateral securing such debt and to all liabilities, including trade payables, of our subsidiaries that have not guaranteed the 2026 Senior Notes. At any time before December 15, 2021 , we may redeem all or a portion of the 2026 Senior Notes at a redemption price equal to 100% of the aggregate principal amount of the 2026 Senior Notes to be redeemed, plus a “make-whole” premium and accrued and unpaid interest to, but excluding, the redemption date. At any time on or after December 15, 2021 , we may redeem all or a portion of the 2026 Senior Notes at certain redemption prices expressed as percentages of the principal amount, plus accrued and unpaid interest to, but excluding, the redemption date. 5.375% Senior Notes due 2020 In August 2012, we issued $700.0 million aggregate principal amount of 5.375% Senior Notes due on August 15, 2020 in a private placement. In October 2012, we issued an additional $350.0 million aggregate principal amount of our 5.375% Senior Notes (collectively the “2020 Senior Notes”). The 2020 Senior Notes bear interest at 5.375% per year, payable in cash semi-annually in arrears. The 2020 Senior Notes are our unsecured senior obligations and are guaranteed on an unsecured senior basis by certain of our domestic subsidiaries, ("the Subsidiary Guarantors"). The 2020 Senior Notes and guarantees rank equally in right of payment with all of our and the Subsidiary Guarantors' existing and future unsecured senior debt and rank senior in right of payment to all of our and the Subsidiary Guarantors' future unsecured subordinated debt. The 2020 Senior Notes and guarantees effectively rank junior to all secured debt of our and the Subsidiary Guarantors to the extent of the value of the collateral securing such debt and to all liabilities, including trade payables, of our subsidiaries that have not guaranteed the 2020 Senior Notes. In January 2017, we repurchased $600.0 million in aggregate principal amount of our 2020 Senior Notes using cash and cash equivalents and the net proceeds from our 2026 Senior Notes issued in December 2016. In January 2017, we recorded an extinguishment loss of $18.6 million . In accordance with the authoritative guidance for debt instruments, a loss on extinguishment is equal to the difference between the reacquisition price and the net carrying amount of the extinguished debt, including any unamortized debt discount or issuance costs. Following this activity, $450.0 million in aggregate principal amount of our 2020 Senior Notes remained outstanding. In September 2018 , we repurchased $150.0 million in aggregate principal amount of our 2020 Senior Notes at par. As a result, we wrote off the related unamortized deferred issuance costs related to the repayment and recorded an extinguishment loss of $0.3 million in fiscal year 2018. Following this activity, $300.0 million in aggregate principal amount of our 2020 Senior Notes remained outstanding. In March 2019, we repurchased the remaining $300.0 million in aggregate principal amount of our 2020 Senior Notes at par using the proceeds from the sale of our Imaging business. As a result, we wrote off the remaining unamortized deferred issuance costs related to the repayment and recorded an extinguishment loss of $0.9 million for the three and six months ended March 31, 2019 . Following this activity, we have fully repaid our 2020 Senior Notes and no amount remained outstanding as of March 31, 2019 . 6.0% Senior Notes due 2024 In June 2016 , we issued $300.0 million aggregate principal amount of 6.0% Senior Notes due on July 1, 2024 (the "2024 Senior Notes") in a private placement. The proceeds from the 2024 Senior Notes were approximately $297.5 million , net of issuance costs. The 2024 Senior Notes bear interest at 6.0% per year, payable in cash semi-annually in arrears. The 2024 Senior Notes are unsecured senior obligations and are guaranteed on an unsecured senior basis by our Subsidiary Guarantors. The 2024 Senior Notes and the guarantees rank equally in right of payment with all of our and the Subsidiary Guarantors’ existing and future unsecured senior debt, and rank senior in right of payment to all of our and the Subsidiary Guarantors’ future unsecured subordinated debt. The 2024 Senior Notes and guarantees effectively rank junior to all our secured debt and that of the Subsidiary Guarantors to the extent of the value of the collateral securing such debt and to all liabilities, including trade payables, of our subsidiaries that have not guaranteed the 2024 Senior Notes. At any time before July 1, 2019, we may redeem all or a portion of the 2024 Senior Notes at a redemption price equal to 100% of the aggregate principal amount of the 2024 Senior Notes to be redeemed, plus a “make-whole” premium and accrued and unpaid interest to, but excluding, the redemption date. At any time on or after July 1, 2019, we may redeem all or a portion of the 2024 Senior Notes at certain redemption prices expressed as percentages of the principal amount, plus accrued and unpaid interest to, but excluding, the redemption date. 1.0% Convertible Debentures due 2035 In December 2015, we issued $676.5 million in aggregate principal amount of 1.0% Senior Convertible Debentures due in 2035 (the “1.0% 2035 Debentures”) in a private placement. The 1.0% 2035 Debentures bear interest at 1.0% per year, payable in cash semi-annually in arrears. The 1.0% 2035 Debentures mature on December 15, 2035 , subject to the right of the holders to require us to redeem the 1.0% 2035 Debentures on December 15, 2022, 2027, or 2032 . The 1.0% 2035 Debentures are general senior unsecured obligations and rank equally in right of payment with all of our existing and future unsecured, unsubordinated indebtedness and senior in right of payment to any indebtedness that is contractually subordinated to the 1.0% 2035 Debentures. The 1.0% 2035 Debentures will be effectively subordinated to indebtedness and other liabilities of our subsidiaries. The initial conversion price is approximately $27.22 per share. At issuance, we allocated $495.4 million to long-term debt, and $181.1 million has been recorded as additional paid-in capital, which is being amortized to interest expense using the effective interest rate method through December 2022 . As of March 31, 2019 , none of the conversion criteria were met for the 1.0% 2035 Debentures. If the conversion criteria were met, we could be required to repay all or some of the aggregate principal amount in cash prior to the maturity date. 2.75% Convertible Debentures due 2031 In October 2011 , we issued $690.0 million in aggregate principal amount of 2.75% Senior Convertible Debentures due in 2031 (the “ 2.75% 2031 Debentures”) in a private placement. The 2.75% 2031 Debentures bear interest at 2.75% per year, payable in cash semi-annually in arrears. The 2.75% 2031 Debentures mature on November 1, 2031 , subject to the right of the holders to require us to redeem the 2.75% 2031 Debentures on November 1, 2021, and 2026 . The 2.75% 2031 Debentures are general senior unsecured obligations and rank equally in right of payment with all of our existing and future unsecured, unsubordinated indebtedness and senior in right of payment to any indebtedness that is contractually subordinated to the 2.75% 2031 Debentures. The 2.75% 2031 Debentures will be effectively subordinated to indebtedness and other liabilities of our subsidiaries. The initial conversion price is approximately $32.30 per share. At issuance, we allocated $533.6 million to long-term debt, and $156.4 million has been recorded as additional paid-in capital, which is being amortized to interest expense using the effective interest rate method through November 2017 . In June 2015, we entered into separate privately negotiated agreements with certain holders of our 2031 Debentures to exchange, in a private placement, $256.2 million in aggregate principal amount of our 2031 Debentures for approximately $263.9 million in aggregate principal amount of our 1.5% 2035 Debentures. In December 2015, we entered into separate privately negotiated agreements with certain holders of our 2031 Debentures to repurchase $38.3 million in aggregate principal with proceeds received from the issuance of our 1.0% 2035 Debentures. In March 2017, we entered into separate privately negotiated agreements with certain holders of our 2031 Debentures to repurchase $17.8 million in aggregate principal with proceeds received from the issuance of our 1.25% Senior Convertible Debentures issued in March 2017. In November 2017, holders of approximately $331.2 million in aggregate principal amount of the outstanding 2031 Debentures exercised their right to require us to repurchase such debentures. Following the repurchase, $46.6 million in aggregate principal amount of the 2.75% 2031 Debentures remains outstanding. On or after November 6, 2017, we have the right to call for redemption of some or all of the remaining outstanding 2031 Debentures. 1.25% Convertible Debentures due 2025 In March 2017, we issued $350.0 million in aggregate principal amount of 1.25% Senior Convertible Debentures due in 2025 (the “1.25% 2025 Debentures”) in a private placement. The proceeds were approximately $343.6 million , net of issuance costs. We used a portion of the proceeds to repurchase 5.8 million shares of our common stock for $99.1 million and $17.8 million in aggregate principal on our 2031 Debentures. We used the remaining net proceeds, together with cash on hand to redeem and retire $331.2 million of our outstanding 2031 Debentures in November 2017. The 1.25% 2025 Debentures bear interest at 1.25% per year, payable in cash semi-annually in arrears. The 1.25% 2025 Debentures mature on April 1, 2025. The 1.25% 2025 Debentures are general senior unsecured obligations and rank equally in right of payment with all of our existing and future unsecured, unsubordinated indebtedness and senior in right of payment to any indebtedness that is contractually subordinated to the 1.25% 2025 Debentures. The 1.25% 2025 Debentures will be effectively subordinated to indebtedness and other liabilities of our subsidiaries. We account separately for the liability and equity components of the 1.25% 2025 Debentures in accordance with authoritative guidance for convertible debt instruments that may be settled in cash upon conversion. The guidance requires the carrying amount of the liability component to be estimated by measuring the fair value of a similar liability that does not have an associated conversion feature and record the remainder in stockholders’ equity. At issuance, we allocated $252.1 million to long-term debt, and $97.9 million has been recorded as additional paid-in capital, which is being amortized to interest expense using the effective interest rate method through April 1, 2025. If converted, the principal amount of the 1.25% 2025 Debentures is payable in cash and any amounts payable in excess of the principal amount will (based on an initial conversion rate, which represents an initial conversion price of approximately $22.22 per share, subject to adjustment under certain circumstances) be paid in cash or shares of our common stock, at our election, only in the following circumstances and to the following extent: (i) prior to October 1, 2024, on any date during any fiscal quarter beginning after June 30, 2017 (and only during such fiscal quarter) if the closing sale price of our common stock was more than 130% of the then current conversion price for at least 20 trading days in the period of the 30 consecutive trading days ending on the last trading day of the previous fiscal quarter; (ii) at any time on or after October 1, 2024, (iii) during the five consecutive business-day period immediately following any five consecutive trading-day period in which the trading price for $1,000 principal amount of the 1.25% 2025 Debentures for each day during such five trading-day period was less than 98% of the closing sale price of our common stock multiplied by the then current conversion rate; or (iv) upon the occurrence of specified corporate transactions, as described in the indenture for the 1.25% 2025 Debentures. We may not redeem the 1.25% 2025 Debentures prior to the maturity date. If we undergo a fundamental change or non-stock change of control (as described in the indenture for the 1.25% 2025 Debentures) prior to maturity, holders will have the option to require us to repurchase all or any portion of their debentures for cash at a price equal to 100% of the principal amount of the 1.25% 2025 Debentures to be purchased plus any accrued and unpaid interest, including any additional interest to, but excluding, the repurchase date. As of March 31, 2019 , none of the conversion criteria were met for the 1.25% 2025 Debentures. If the conversion criteria were met, we could be required to repay all or some of the aggregate principal amount in cash prior to the maturity date. 1.50% Convertible Debentures due 2035 In June 2015, we issued $263.9 million in aggregate principal amount of 1.50% Senior Convertible Debentures due in 2035 (the “1.5% 2035 Debentures”) in exchange for $256.2 million in aggregate principal amount of our 2031 Debentures. The 1.5% 2035 Debentures were issued at 97.09% of the principal amount, which resulted in a discount of $7.7 million . The 1.5% 2035 Debentures bear interest at 1.50% per year, payable in cash semi-annually in arrears. The 1.5% 2035 Debentures mature on November 1, 2035, subject to the right of the holders to require us to redeem the 1.5% 2035 Debentures on November 1, 2021, 2026, or 2031. The 1.5% 2035 Debentures are general senior unsecured obligations and rank equally in right of payment with all of our existing and future unsecured, unsubordinated indebtedness and senior in right of payment to any indebtedness that is contractually subordinated to the 1.5% 2035 Debentures. The 1.5% 2035 Debentures will be effectively subordinated to indebtedness and other liabilities of our subsidiaries. The initial conversion price is approximately $23.26 per share. At issuance, we allocated $208.6 million to long-term debt, and $55.3 million has been recorded as additional paid-in capital, which is being amortized to interest expense using the effective interest rate method through November 2021. As of March 31, 2019 , none of the conversion criteria were met for the 1.5% 2035 Debentures. If the conversion criteria were met, we could be required to repay all or some of the aggregate principal amount in cash prior to the maturity date. Revolving Credit Facility Our revolving credit agreement (the “Revolving Credit Facility”), which expires on April 15, 2021, provides for aggregate borrowing commitments of $242.5 million , including the revolving facility loans, the swingline loans and issuance of letters of credit. As of March 31, 2019 , after taking into account the outstanding letters of credit of $6.9 million , we had $235.6 million available for borrowing under the Revolving Credit Facility. The borrowing outstanding under the Revolving Credit Facility bears interest at either (i) LIBOR plus an applicable margin of 1.50% or 1.75% , or (ii) the alternative base rate plus an applicable margin of 0.50% or 0.75% . The Revolving Credit Facility is secured by substantially all our assets. The Revolving Credit Facility contains customary affirmative and negative covenants and conditions to borrowing, as well as customary events of default. As of March 31, 2019 , we are in compliance with all the debt covenants.

Stockholders' Equity Stockholde

Stockholders' Equity Stockholders' Equity (Notes)	6 Months Ended
	Mar. 31, 2019
Stockholders' Equity Attributable to Parent [Abstract]
Stockholders' Equity Note Disclosure [Text Block]	Stockholders' Equity Share Repurchases On April 29, 2013 , our Board of Directors approved a share repurchase program for up to $500.0 million , which was increased by $500.0 million on April 29, 2015. On August 1, 2018, our Board of Directors approved an additional $500.0 million under our share repurchase program. Under the terms of the share repurchase program, we have the ability to repurchase shares through a variety of methods, which may include open market purchases, privately negotiated transactions, block trades, accelerated stock repurchase transactions, or any combination of such methods. The share repurchase program does not require us to acquire any specific number of shares and may be modified, suspended, extended or terminated by us at any time without prior notice. The timing and the amount of any purchases will be determined by management based on an evaluation of market conditions, capital allocation alternatives, and other factors. We repurchased 1.2 million shares of our common stock for $16.2 million for the three months ended March 31, 2019 and 6.1 million shares of our common stock for $91.3 million for the six months ended March 31, 2019 . There were no share repurchases for the three or six months ended March 31, 2018 . Since the commencement of the program, we have repurchased an aggregate of 62.2 million shares for $1,034.0 million . The amount paid in excess of par value is recognized in additional paid in capital. Shares were retired upon repurchase. As of March 31, 2019 , approximately $466.0 million remained available for future repurchases under the program.

Net Income (Loss) Per Share

Net Income (Loss) Per Share	6 Months Ended
	Mar. 31, 2019
Earnings Per Share, Basic and Diluted [Abstract]
Net (Loss) Income Per Share	Net Income (Loss) Per Share The following table sets forth the computation for basic and diluted net income (loss) per share (in thousands, except per share amounts): Three Months Ended March 31, Six Months Ended March 31, 2019 2018 2019 2018 Numerator: Net loss from continuing operations $ (20,749 ) $ (167,141 ) $ (3,050 ) $ (119,676 ) Net income from discontinued operations 98,081 3,088 99,472 8,851 Net income (loss) $ 77,332 $ (164,053 ) $ 96,422 $ (110,825 ) Denominator: Weighted average common shares outstanding — basic 285,866 294,103 286,849 292,720 Dilutive effect of employee stock compensation plans — — — — Weighted average common shares outstanding — diluted 285,866 294,103 286,849 292,720 Net income (loss) per common share - basic: Continuing operations $ (0.07 ) $ (0.57 ) $ (0.01 ) $ (0.41 ) Discontinued operations 0.34 0.01 0.35 0.03 Total net income (loss) per basic common share $ 0.27 $ (0.56 ) $ 0.34 $ (0.38 ) Net income (loss) per common share - diluted: Continuing operations $ (0.07 ) $ (0.57 ) $ (0.01 ) $ (0.41 ) Discontinued operations 0.34 0.01 0.35 0.03 Total net income (loss) per diluted common share $ 0.27 $ (0.56 ) $ 0.34 $ (0.38 ) Anti-dilutive equity instruments excluded from the calculation 460 2,679 635 4,178 Contingently issuable awards excluded from the calculation (a) 2,646 2,836 2,422 2,387 (a) Certain contingently issuable awards were excluded from the determination of dilutive net income per share as the conditions were not met at the end of the reporting period.

Stock-Based Compensation

Stock-Based Compensation	6 Months Ended
	Mar. 31, 2019
Share-based Compensation [Abstract]
Stock-Based Compensation	Stock-Based Compensation On January 17, 2019, our shareholders approved amendments to the Company’s amended and restated 2000 Stock Plan (the “Amended and Restated 2000 Stock Plan”). The Amended and Restated 2000 Stock Plan (i) increases the number of shares issuable by 82,250,000 to 83,500,000 shares; (ii) permits the Company’s Board of Directors (the “Board”) to make proportional adjustments to outstanding awards affected by a change in the Company’s capital structure, and in addition to or in lieu of such adjustments, to permit the Board to pay dividends, dividend equivalents, or similar rights in conjunction to any such changes in the Company’s capital structure; and (iii) certain updates to reflect changes in law relating to Section 162(m). As of March 31, 2019 , we had 8.4 million shares available for future grants under the Amended and Restated 2000 Stock Plan. We recognize stock-based compensation expenses over the requisite service periods. Our share-based awards are classified within equity. The amounts included in the condensed consolidated statements of operations related to stock-based compensation are as follows (dollars in thousands): Three Months Ended March 31, Six Months Ended March 31, 2019 2018 2019 2018 Cost of hosting and professional services $ 5,481 $ 6,306 $ 12,813 $ 13,684 Cost of product and licensing 132 112 396 378 Cost of maintenance and support 381 538 147 1,219 Research and development 7,820 7,757 16,650 16,764 Sales and marketing 7,638 7,372 16,895 17,536 General and administrative 8,419 9,657 17,310 18,386 Total $ 29,871 $ 31,742 $ 64,211 $ 67,967 Stock Options The table below summarizes activities related to stock options for the six months ended March 31, 2019 : Number of Shares Weighted Average Exercise Price Weighted Average Remaining Contractual Term Aggregate Intrinsic Value (a) Outstanding at September 30, 2018 19,144 $ 17.31 Exercised (1,500 ) $ 12.79 Expired (4,528 ) $ 17.89 Outstanding at March 31, 2019 13,116 $ 17.63 2.9 years $ 0.1 million Exercisable at March 31, 2019 13,116 $ 17.63 2.9 years $ 0.1 million Exercisable at March 31, 2018 21,939 $ 16.41 2.6 years $ 0.1 million (a) The aggregate intrinsic value in this table represents any excess of the closing market price of our common stock as of March 31, 2019 ( $16.93 ) over the exercise price of the underlying options. The aggregate intrinsic values of stock options exercised during the six months ended March 31, 2019 and 2018 were de minimis. Restricted Units Restricted units are not included in issued and outstanding common stock until the units are vested and underlying shares are released. The purchase price for vested restricted units is $0.001 per share. The table below summarizes activities relating to restricted units for the six months ended March 31, 2019 : Number of Shares Underlying Restricted Units — Contingent Awards Number of Shares Underlying Restricted Units — Time-Based Awards Outstanding at September 30, 2018 3,039,568 6,872,087 Granted 1,332,963 5,913,256 Earned/released (1,366,735 ) (4,594,896 ) Modification (a) (296,759 ) 296,759 Forfeited (613,805 ) (937,614 ) Outstanding March 31, 2019 2,095,232 7,549,592 Weighted average remaining recognition period of outstanding restricted units 1.9 years 1.7 years Unrecognized stock-based compensation expense of outstanding restricted units $30.4 million $71.2 million Aggregate intrinsic value of outstanding restricted units (b) $40.2 million $123.3 million (a) 296,759 shares of contingently issuable awards with market conditions were modified to time-based awards with only service conditions in December 2018. (b) The aggregate intrinsic value in this table represents any excess of the closing market price of our common stock as of March 31, 2019 ( $16.93 ) over the purchase price of the underlying restricted units. A summary of the weighted-average grant-date fair value of restricted units granted, and the aggregate intrinsic value of restricted units vested during the periods noted is as follows: Six Months Ended March 31, 2019 2018 Weighted-average grant-date fair value per share $ 16.35 $ 15.67 Total intrinsic value of shares vested (in millions) $ 95.2 $ 94.0

Income Taxes

Income Taxes	6 Months Ended
	Mar. 31, 2019
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The components of loss from continuing operations before income taxes are as follows (dollars in thousands): Three Months Ended March 31, Six Months Ended March 31, 2019 2018 2019 2018 Domestic $ (35,351 ) $ (80,758 ) $ (15,563 ) $ (119,867 ) Foreign 13,644 (84,390 ) 12,541 (76,785 ) Loss before income taxes $ (21,707 ) $ (165,148 ) $ (3,022 ) $ (196,652 ) The components of (benefit) provision for income taxes are as follows (dollars in thousands): Three Months Ended March 31, Six Months Ended March 31, 2019 2018 2019 2018 Domestic $ (5,272 ) $ 6,989 $ (5,719 ) $ (90,143 ) Foreign 4,314 (4,996 ) 5,747 13,167 (Benefit) provision for income taxes $ (958 ) $ 1,993 $ 28 $ (76,976 ) Effective tax rate 4.4 % (1.2 )% (0.9 )% 39.1 % The effective tax rates were estimated based upon estimated income for the year, the composition of the income in different countries, changes relating to valuation allowances for certain countries if and as necessary, and adjustments, if any, for the potential tax consequences, benefits or resolutions of audits or other tax contingencies. Our aggregate income tax rate in foreign jurisdictions is lower than our income tax rate in the United States; the majority of our income before provision for income taxes from foreign operations has been earned by subsidiaries in Ireland. Our effective tax rate may be adversely affected by earnings being lower than anticipated in countries where we have lower statutory tax rates and higher than anticipated in countries where we have higher statutory tax rates. Our effective income tax rate was 4.4% for the three months ended March 31, 2019 , compared to (1.2)% for the three months ended March 31, 2018 . The effective tax rates for the three months ended March 31, 2019 and March 31, 2018 differed from the U.S. federal statutory rates of 21.0% and 24.53% , respectively, primarily due to the valuation allowance related to losses in the United States. Our effective income tax rate was (0.9)% for the six months ended March 31, 2019 , compared to 39.1% for the six months ended March 31, 2018 . The effective tax rates for the six months ended March 31, 2019 and March 31, 2018 differed from the U.S. federal statutory rates of 21.0% and 24.53% , respectively, primarily due to the valuation allowance related to losses in the United States. Additionally, for the six months ended March 31, 2018 , we recognized approximately $87 million of deferred tax benefit from the remeasurement of deferred tax assets and liabilities offset by approximately $2 million estimated tax provision for deemed repatriated foreign earnings as a result of the Tax Cuts and Jobs Act ("TCJA") enacted in December 2017.

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Mar. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	ommitments and Contingencies Litigation and Other Claims Similar to many companies in the software industry, we are involved in a variety of claims, demands, suits, investigations and proceedings that arise from time to time relating to matters incidental to the ordinary course of our business, including at times actions with respect to contracts, intellectual property, employment, benefits and securities matters. At each balance sheet date we evaluate contingent liabilities associated with these matters in accordance with ASC 450 “Contingencies.” If the potential loss from any claim or legal proceeding is considered probable and the amount can be reasonably estimated, we accrue a liability for the estimated loss. Significant judgments are required for the determination of probability and the range of the outcomes, and estimates are based only on the best information available at the time. Due to the inherent uncertainties involved in claims and legal proceedings and in estimating losses that may arise, actual outcomes may differ from our estimates. Contingencies deemed not probable or for which losses were not estimable in one period may become probable, or losses may become estimable in later periods, which may have a material impact on our results of operations and financial position. As of March 31, 2019 , accrued losses were not material to our condensed consolidated financial statements, and we do not expect any pending matter to have a material impact on our condensed consolidated financial statements. Guarantees and Other We include indemnification provisions in the contracts we enter with customers and business partners. Generally, these provisions require us to defend claims arising out of our products’ infringement of third-party intellectual property rights, breach of contractual obligations and/or unlawful or otherwise culpable conduct. The indemnity obligations generally cover damages, costs and attorneys’ fees arising out of such claims. In most, but not all cases, our total liability under such provisions is limited to either the value of the contract or a specified, agreed upon amount. In some cases, our total liability under such provisions is unlimited. In many, but not all cases, the term of the indemnity provision is perpetual. While the maximum potential amount of future payments we could be required to make under all the indemnification provisions is unlimited, we believe the estimated fair value of these provisions is minimal due to the low frequency with which these provisions have been triggered. We indemnify our directors and officers to the fullest extent permitted by Delaware law, which provides among other things, indemnification to directors and officers for expenses, judgments, fines, penalties and settlement amounts incurred by such persons in their capacity as a director or officer of the company, regardless of whether the individual is serving in any such capacity at the time the liability or expense is incurred. Additionally, in connection with certain acquisitions, we agreed to indemnify the former officers and members of the boards of directors of those companies, on similar terms as described above, for a period of six years from the acquisition date. In certain cases, we purchase director and officer insurance policies related to these obligations, which fully cover the six -year period. To the extent that we do not purchase a director and officer insurance policy for the full period of any contractual indemnification, and such directors and officers do not have coverage under separate insurance policies, we would be required to pay for costs incurred, if any, as described above.

Segment and Geographic Informat

Segment and Geographic Information and Significant Customers	6 Months Ended
	Mar. 31, 2019
Segment Reporting [Abstract]
Segment and Geographic Information and Significant Customers	Segment and Geographic Information Our Chief Operating Decision Maker ("CODM") regularly reviews segment revenues and segment profits for performance evaluation and resources allocation. Segment revenues include certain acquisition-related adjustments for revenues that would otherwise have been recognized without the acquisition. Segment profits reflect controllable costs directly related to each segment and the allocation of certain corporate expenses such as, corporate sales and marketing expenses and research and development project costs that benefit multiple segments. Certain items such as stock-based compensation, amortization of intangible assets, acquisition-related costs, net, restructuring and other charges, net, other expenses, net and certain unallocated corporate expenses are excluded from segment profits, which allow for more meaningful comparisons to the financial results of the historical operations for performance evaluation and resources allocation by our CODM. • The Healthcare segment is primarily engaged in providing clinical speech and clinical language understanding solutions that improve the clinical documentation process, from capturing the complete patient record to improving clinical documentation and quality measures for reimbursement. • The Enterprise segment is primarily engaged in using speech, natural language understanding, and artificial intelligence to provide automated customer solutions and services for voice, mobile, web and messaging channels. • The Automotive segment is primarily engaged in providing automotive manufacturers and their suppliers branded and personalized virtual assistants and connected car services built on our voice recognition and natural language understanding technologies. As more fully disclosed in Note 4 , on November 19, 2018, we announced our intent to spin off our Automotive business into an independent publicly-traded company through a pro rata distribution to our common stock holders. Completion of the proposed spin-off is subject to certain conditions, including final approval by our Board of Directors. We expect to complete the spin-off by the beginning of fiscal year 2020. • The Other segment includes our SRS business and our Devices business. Our SRS business provides value-added services to mobile operators in India and Brazil ("Mobile Operator Services") and voicemail transcription services to mobile operators in the rest of the world (“Voicemail-to-Text”). Our Devices business provides speech recognition solutions and predictive text technologies to handset devices. Our Devices revenue has been declining due to the ongoing consolidation of our handset manufacturer customer base and continued erosion of our penetration of the remaining market. During the fourth quarter of fiscal 2018, in connection with our comprehensive portfolio and business review efforts, we commenced a wind-down of our Devices and Mobile Operator Services businesses. As more fully described in Note 4, effective the first quarter of fiscal year 2019, the results of our Imaging segment, previously a reportable segment, have been included within discontinued operations due to the completion of the sale on February 1, 2019. As a result, effective the first quarter of fiscal year 2019, we changed our corporate overhead allocation methodology to re-allocate the stranded costs related to our Imaging business to the remaining operating segments included within continuing operations. Our segment presentation for the three and six months ended March 31, 2018 has been restated to reflect the re-allocation of stranded costs. For the three months ended March 31, 2019 and 2018, $0.7 million and $1.8 million of stranded costs have been included within total segment profits and re-allocated to Healthcare, Enterprise, Automotive, and Other; for the six months ended March 31, 2019 and 2018, $1.8 million and $3.7 million of stranded costs have been included within total segment profits and re-allocated to Healthcare, Enterprise, Automotive, and Other. We do not track our assets by segment. Consequently, it is not practical to show assets or depreciation by segment. The following table presents segment results along with a reconciliation of segment profit to Loss before income taxes (dollars in thousands): Three Months Ended Six Months Ended March 31, March 31, 2019 2018 2019 2018 Segment revenues : (ASC 606) (ASC 605) (ASC 606) (ASC 605) Healthcare $ 204,549 $ 261,240 $ 476,527 $ 506,775 Enterprise 115,637 112,667 245,329 233,266 Automotive 74,242 68,950 149,424 130,448 Other 16,737 26,524 35,095 52,087 Total segment revenues 411,165 469,381 906,375 922,576 Less: acquisition-related revenues adjustments (1,582 ) (3,188 ) (3,138 ) (9,159 ) Total revenues 409,583 466,193 903,237 913,417 Segment profit: Healthcare 63,136 86,235 167,058 162,462 Enterprise 23,549 25,288 68,195 62,565 Automotive 26,580 28,719 45,965 51,745 Other 5,639 6,013 11,441 9,331 Total segment profit 118,904 146,255 292,659 286,103 Corporate expenses and other, net (32,435 ) (63,508 ) (68,057 ) (107,079 ) Acquisition-related revenues (1,582 ) (3,188 ) (3,138 ) (9,159 ) Stock-based compensation (29,871 ) (31,742 ) (64,211 ) (67,967 ) Amortization of intangible assets (26,004 ) (31,455 ) (52,735 ) (63,810 ) Acquisition-related costs, net (2,233 ) (2,360 ) (5,069 ) (7,921 ) Restructuring and other charges, net (21,469 ) (8,881 ) (44,550 ) (22,450 ) Impairment of goodwill — (137,907 ) — (137,907 ) Other expenses, net (27,017 ) (32,362 ) (57,921 ) (66,462 ) Loss before income taxes $ (21,707 ) $ (165,148 ) $ (3,022 ) $ (196,652 ) No country outside of the United States provided greater than 10% of our total revenues. Revenues, classified by the major geographic areas in which our customers are located, were as follows (dollars in thousands): Three Months Ended Six Months Ended March 31, March 31, 2019 2018 2019 2018 (ASC 606) (ASC 605) (ASC 606) (ASC 605) United States $ 299,101 $ 342,003 $ 682,533 $ 680,486 International 110,482 124,190 220,704 232,931 Total revenues $ 409,583 $ 466,193 $ 903,237 $ 913,417

Supplemental Cash Flow (Notes)

Supplemental Cash Flow (Notes)	6 Months Ended
	Mar. 31, 2019
Supplemental Cash Flow [Abstract]
Cash Flow, Supplemental Disclosures [Text Block]	. Supplemental Cash Flow Information Cash paid for Interest and Income Taxes: Three Months Ended March 31, Six Months Ended March 31, 2019 2018 2019 2018 (Dollars in thousands) Interest paid $ 9,186 $ 21,427 $ 40,754 $ 48,708 Income taxes paid $ 4,407 $ 4,233 $ 7,214 $ 8,833 Non-Cash Investing and Financing Activities: From time to time, we issue shares of our common stock in connection with our business and asset acquisitions, including shares issued as payment for acquisitions, shares initially held in escrow, and shares issued as payment for contingent consideration, as more fully described in Note 5 .

Related party transaction (Note

Related party transaction (Notes)	6 Months Ended
	Mar. 31, 2019
Related Party Transactions [Abstract]
Related Party Transactions Disclosure [Text Block]	Related Party Transaction In January 2018, we entered into a software and license agreement (the "License Agreement") with Magnet Systems, Inc. ("Magnet"). A member of the Magnet board of directors also served on our board of directors at the time of the transaction. Pursuant to the License Agreement, Magnet granted Nuance a perpetual software license to certain technology for a one-time payment of $5.0 million in cash, with $3.5 million paid immediately upon the effective date of the License Agreement and $1.5 million payable upon the earlier of (i) the 120-day period following the effective date of the License Agreement or (ii) signature of a statement of work for the engineering services described below. The amount for license was fully paid in fiscal year 2018. Additionally, we entered into a service agreement (the "Service Agreement") with Magnet, pursuant to which, Magnet would provide engineering services to assist in integrating the licensed technology into certain of our Enterprise solutions. The fees under the Service Agreement total $2.0 million , payable in six equal monthly installments upon the signature of the statement of work, which is to be finalized within 90 days following the effective date of the License Agreement. We have incurred $2.0 million service costs up to date, $0.3 million and $0.9 million of which were incurred during the three and six months ended March 31, 2019, respectively. As of March 31, 2019 , capitalized amount related to payments for license and services totaled $9.0 million .

Revenue Recognition Revenue Rec

Revenue Recognition Revenue Recognition (Policies)	6 Months Ended
	Mar. 31, 2019
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer [Policy Text Block]	We derive revenue from the following sources: (1) hosting services, (2) software licenses, including royalties, (3) maintenance and support (“M&S”), (4) professional services, and (5) sale of hardware. Revenue is reported net of applicable sales and use tax, value-added tax and other transaction taxes imposed on the related transaction including mandatory government charges that are passed through to our customers. We account for a contract when both parties have approved and committed to the contract, the rights of the parties are identified, payment terms are identified, the contract has commercial substance and collectability of consideration is probable. The majority of our arrangements with customers typically contain multiple products and services. We account for individual products and services separately if they are distinct--that is, if a product or service is separately identifiable from other items in the contract and if a customer can benefit from it on its own or with other resources that are readily available to the customer. We recognize revenue after applying the following five steps: • identification of the contract, or contracts, with a customer; • identification of the performance obligations in the contract, including whether they are distinct within the context of the contract; • determination of the transaction price, including the constraint on variable consideration; • allocation of the transaction price to the performance obligations in the contract; and • recognition of revenue when, or as, performance obligations are satisfied. We allocate the transaction price of the arrangement based on the relative estimated standalone selling price (“SSP”) of each distinct performance obligation. In determining SSP, we maximize observable inputs and consider a number of data points, including: • the pricing of standalone sales (in the instances where available); • the pricing established by management when setting prices for deliverables that are intended to be sold on a standalone basis; • contractually stated prices for deliverables that are intended to be sold on a standalone basis; and • other pricing factors, such as the geographical region in which the products are sold and expected discounts based on the customer size and type. We only include estimated amounts of variable consideration in the transaction price to the extent it is probable that a significant reversal of cumulative revenue recognized will not occur when the uncertainty associated with the variable consideration is resolved. We reduce transaction prices for estimated returns and other allowances that represent variable consideration under ASC 606, which we estimate based on historical return experience and other relevant factors, and record a corresponding refund liability as a component of accrued expenses and other current liabilities. Other forms of contingent revenue or variable consideration are infrequent. Revenue is recognized when control of these products and services is transferred to our customers, in an amount that reflects the consideration we expect to be entitled to in exchange for those services. We assess the timing of the transfer of products or services to the customer as compared to the timing of payments to determine whether a significant financing component exists. In accordance with the practical expedient in ASC 606-10-32-18, we do not assess the existence of a significant financing component when the difference between payment and transfer of deliverables is a year or less. If the difference in timing arises for reasons other than the provision of finance to either the customer or us, no financing component is deemed to exist. The primary purpose of our invoicing terms is to provide customers with simplified and predictable ways of purchasing our services, not to receive or provide financing from or to customers. We do not consider set-up fees nor other upfront fees paid by our customers to represent a financing component. Certain products are sold through distributors or resellers. Certain distributors and resellers have been granted right of return and selling incentives which are accounted for as variable consideration when estimating the amount of revenue to be recognized. Returns and credits are estimated at the contract inception and updated at the end of each reporting period as additional information becomes available. In accordance with the practical expedient in ASC 606-10-10-4, we apply a portfolio approach to estimate the variable consideration associated with this group of customers. Reimbursements for out-of-pocket costs generally include, but are not limited to, costs related to transportation, lodging and meals. Revenue from reimbursed out-of-pocket costs is accounted for as variable consideration. Shipping and handling activities are not considered a contract performance obligation. We record shipping and handling costs billed to customers as revenue with offsetting costs recorded as cost of revenue. Performance Obligations Hosting Hosting services, which allow our customers to use the hosted software over the contract period without taking possession of the software, are provided on a usage basis as consumed or on a fixed fee subscription basis. Our hosting contract terms generally range from one to five years. As each day of providing services is substantially the same and the customer simultaneously receives and consumes the benefits as access is provided, we have determined that our hosting services arrangements are a single performance obligation comprised of a series of distinct services. These services include variable consideration, typically a function of usage. We recognize revenue as each distinct service period is performed (i.e., recognized as incurred). Subscription basis revenue represents a single promise to stand-ready to provide access to our hosting services. Revenue is recognized over time on a ratable basis over the hosting contract term, which generally ranges from one to five years. Software Licenses On-premise software licenses sold with non-distinct professional services to customize and/or integrate the underlying software are accounted for as a combined performance obligation. Revenue from the combined performance obligation is recognized over time based upon the progress towards completion of the project, which is measured based on the labor hours already incurred to date as compared to the total estimated labor hours. Revenue from distinct on-premise software licenses, which do not require professional services to customize and/or integrate the software license, is recognized at the point in time when the software is made available to the customer and control is transferred. Revenue from software license sold on a royalty basis, where the license of intellectual property is the predominant item to which the royalty relates, is recognized in the period the usage occurs in accordance with the practical expedient in ASC 606-10-55-65(A). Maintenance and Support Our M&S contracts generally include telephone support and the right to receive unspecified upgrades and updates on a when-and-if available basis. M&S revenue is recognized over time on ratable basis over the contract period because we transfer control evenly by providing a stand-ready service. Professional Services Revenue from distinct professional services, including training, is recognized over time based upon the progress towards completion of the project, which is measured based on the labor hours already incurred to date as compared to the total estimated labor hours. Hardware Hardware revenue is recognized point in time when control is transferred to the customer, typically delivery. Significant Judgments Determining whether products and services are considered distinct performance obligations that should be accounted for separately versus together may require significant judgment. Our license contracts often include professional services to customize and/or integrate the licenses into the customer’s environment. Judgment is required to determine whether the license is considered distinct and accounted for separately, or not distinct and accounted for together with professional services. Judgments are required to determine the SSP for each distinct performance obligation. When SSP is directly observable, we estimate SSP based upon the historical transaction prices, adjusted for geographic considerations, customer classes, and customer relationship profiles. In instances where SSP is not directly observable, we determine SSP using information that may include market conditions and other observable inputs. We may have more than one SSP for individual products and services due to the stratification of those products and services by customers and circumstances. In these instances, we may use information such as the size of the customer and geographic region in determining SSP. Determining SSP for performance obligations which we never sell separately also requires significant judgment. In estimating the SSP, we consider the likely price that would have resulted from established pricing practices had the deliverable been offered separately and the prices a customer would likely be willing to pay. From time to time, we may enter into arrangements with third party suppliers to resell products or services. In such cases, we evaluate whether we are the principal (i.e. report revenues on a gross basis) or agent (i.e. report revenues on a net basis). In doing so, we first evaluate whether we control the good or service before it is transferred to the customer. If we control the good or service before it is transferred to the customer, we are the principal; if not, we are the agent. Generally, we control a promised good or service before transferring that good or service to the customer and act as the principal to the transaction. Determining whether we control the good or service before it is transferred to the customer may require judgment. Disaggregated Revenue We disaggregate revenue from contracts with customers by reportable segment and products and services as this presentation depicts the timing, risks and uncertainty of our revenue streams, which is also in line with how we manage our businesses, assess performance, and determine management compensation. Our disaggregated revenue from continuing operations is as follows (dollars in thousands): For the Three Months Ended March 31, 2019 Hosting and professional services Product and licensing Maintenance and support Total Healthcare $ 125,867 $ 41,708 $ 36,829 $ 204,404 Enterprise 76,674 14,774 23,994 115,442 Automotive 33,584 39,317 98 72,999 Other 14,986 1,744 8 16,738 Total revenues $ 251,111 $ 97,543 $ 60,929 $ 409,583 For the Six Months Ended March 31, 2019 Hosting and professional services Product and licensing Maintenance and support Total Healthcare $ 259,382 $ 134,737 $ 82,150 $ 476,269 Enterprise 155,216 35,053 54,625 244,894 Automotive 65,455 81,425 98 146,978 Other 30,646 4,325 125 35,096 Total revenues $ 510,699 $ 255,540 $ 136,998 $ 903,237 Hardware comprised approximately $7.1 million of total product and license revenue for the three months ended March 31, 2019 and $17.2 million for the six months ended March 31, 2019 . Contract Acquisition Costs In conjunction with the adoption of ASC 606, we are required to capitalize certain contract acquisition costs. The capitalized costs primarily relate to paid commissions and other direct, incremental cost to acquire customer contracts. In accordance with the practical expedient in ASC 606-10-10-4, we apply a portfolio approach to estimate contract acquisition costs for groups of customer contracts. We elect to apply the practical expedient in ASC 340-40-25-4 and will expense contract acquisition costs as incurred where the expected period of benefit is one year or less. Sales commissions paid on renewal maintenance and support are not commensurate with sales commissions paid on the initial maintenance and support contract. Contract acquisition costs are deferred and amortized on a straight-line basis over the period of benefit, which we have estimated to be between one and five years. The period of benefit was determined based on an average customer contract term, expected contract renewals, changes in technology and our ability to retain customers including canceled contracts. Contract acquisition costs are classified as current or noncurrent assets based on when the expense will be recognized. The current and noncurrent portions of contract acquisition costs are included in Prepaid expenses and other current assets, and Other assets, respectively. As of March 31, 2019 , we had $17.7 million of current contract acquisition costs and $27.8 million of noncurrent contract acquisition costs. Commission expense is primarily included in Sales and marketing expense on the condensed consolidated statements of operations. We had amortization expense of $3.7 million related to contract acquisition costs for the three months ended March 31, 2019 and $7.2 million for the six months ended March 31, 2019 . There was no impairment related to commission costs capitalized. Contract Fulfillment Costs We capitalize the setup costs incurred to satisfy our stand-ready obligation to provide access to our hosting service. Contract fulfillment costs are expensed to cost of revenue as we satisfy our stand-ready obligation over the contract term which we estimate to be between one and five years. The contract term was determined based on an average customer contract term, expected contract renewals, changes in technology, and our ability to retain customers including canceled contracts. We classify contract fulfillment costs as current or noncurrent based on the timing of when we expect to recognize the expense. The current and noncurrent portions of capitalized contract fulfillment costs are included in Prepaid expenses and other current assets, and Other assets, respectively. At March 31, 2019 , we had $13.4 million of short-term contract fulfillment costs included with Prepaid expenses and other current assets and $96.2 million of long-term costs included within Other assets. Trade Accounts Receivable and Contract Balances We classify our right to consideration in exchange for deliverables as either a receivable or a contract asset. A receivable is a right to consideration that is unconditional (i.e. only the passage of time is required before payment is due). We present such receivables in Accounts receivable, net in our condensed consolidated balance sheets at their net estimated realizable value. We maintain an allowance for doubtful accounts to provide for the estimated amount of receivables that may not be collected. The allowance is based upon an assessment of customer creditworthiness, historical payment experience, the age of outstanding receivables and other applicable factors. Our contract assets and liabilities are reported in a net position on a contract-by-contract basis at the end of each reporting period. Contract assets include unbilled amounts from long-term contracts when revenue recognized exceeds the amount billed to the customer, and right to payment is not solely subject to the passage of time. The current and noncurrent portions of contract assets are included in Prepaid expenses and other current assets and Other assets. As of March 31, 2019 , we had $59.8 million of current contract assets and $100.8 million of noncurrent contract assets. The table below shows significant changes in contract assets of continuing operations (dollars in thousands): Contract assets Balance as of October 1, 2018 $ 168,595 Revenues recognized but not billed 156,541 Amounts reclassified to accounts receivable (164,483 ) Balance at March 31, 2019 $ 160,653 Our contract liabilities, or deferred revenue, consist of advance payments and billings in excess of revenues recognized. We classify deferred revenue as current or noncurrent based on when we expect to recognize the revenues. At March 31, 2019 , we had $715.2 million of deferred revenue. The table below shows significant changes in deferred revenue of continuing operations (dollars in thousands): Deferred revenue Balance as of October 1, 2018 $ 693,272 Amounts bill but not recognized 506,225 Revenue recognized (484,314 ) Balance at March 31, 2019 $ 715,183 Remaining Performance Obligations The following table includes estimated revenue expected to be recognized in the future related to performance obligations that are unsatisfied or partially unsatisfied at March 31, 2019 (dollars in thousands): Within One Year Two to Five Years Greater than Five years Total Total revenue $ 748,526 $ 1,138,447 $ 112,907 $ 1,999,880 The table above includes fixed backlogs and does not include variable backlog derived from continent usage-based activities, such as royalties and usage-based hosting revenue.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies Recently Issued Accounting Pronouncements (Tables)	6 Months Ended
	Mar. 31, 2019
Recently Issued Accounting Pronouncements [Abstract]
ASC 606 Impact, Income Statement [Table Text Block]	For the Six Months Ended March 31, 2019 As reported, ASC 606 Effect of Implementation As adjusted, ASC 605 Revenues: Hosting and professional services $ 510,699 $ 21,236 $ 531,935 Product and licensing 255,540 3,923 259,463 Maintenance and support 136,998 (15,759 ) 121,239 Total revenues $ 903,237 $ 9,400 $ 912,637 Cost of revenues: Hosting and professional services $ 316,807 $ (3,253 ) $ 313,554 Product and licensing 42,690 (11,445 ) 31,245 Maintenance and support 16,727 47 16,774 Amortization of intangible assets 18,805 — 18,805 Total cost of revenues $ 395,029 $ (14,651 ) $ 380,378 Sales and marketing $ 151,114 $ (580 ) $ 150,534 Provision for income taxes $ 28 $ 10,679 $ 10,707
ASC 606 Impact, Balance Sheet [Table Text Block]	As of March 31, 2019 As reported, ASC 606 Effect of Implementation As adjusted, ASC 605 Assets: Accounts receivable $ 292,567 $ 27,293 $ 319,860 Prepaid expenses and other current assets $ 171,717 $ (39,059 ) $ 132,658 Other assets $ 255,928 $ (135,321 ) $ 120,607 Liabilities: Deferred revenue, current $ 300,746 $ 56,065 $ 356,811 Deferred revenue, noncurrent $ 414,437 $ 16,154 $ 430,591 Deferred tax liabilities $ 51,656 $ (9,923 ) $ 41,733 Other long-term liabilities $ 103,214 $ (11,557 ) $ 91,657 Stockholders' Equity: Accumulated deficit $ (411,000 ) $ (198,019 ) $ (609,019 )
New Accounting Pronouncements, Policy [Policy Text Block]	Issued Accounting Standards Not Yet Adopted Leases In February 2016, the FASB issued ASU No. 2016-02, "Leases" ("ASU 2016-02"). ASU 2016-02 requires lessees to recognize on the balance sheet a right-of-use asset, representing its right to use the underlying asset for the lease term, and a lease liability for all leases with terms greater than 12 months. The guidance also requires qualitative and quantitative disclosures designed to assess the amount, timing, and uncertainty of cash flows arising from leases. The standard requires the use of a modified retrospective transition approach, which includes a number of optional practical expedients that entities may elect to apply. ASU 2016-02 is effective for us in the first quarter of fiscal year 2020, and early application is permitted. In July 2018, the FASB issued ASU 2018-10, Codification Improvements to Topic 842, Leases and ASU 2018-11, Leases Topic 842 Target improvements, which provides an additional (and optional) transition method whereby the new lease standard is applied at the adoption date and recognized as an adjustment to retained earnings. We are currently evaluating the impact of our pending adoption of ASU 2016-02 on our condensed consolidated financial statements, and we currently expect that most of our operating lease commitments will be subject to the new standard and recognized as operating lease liabilities and right-of-use assets upon our adoption of ASU 2016-02, which will increase our total assets and total liabilities that we report relative to such amounts prior to adoption. Other Accounting Pronouncements In August 2018, the FASB issued ASU No. 2018-15, "Intangibles-Goodwill and Other-Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract" ("ASU 2018-15”), which is effective for fiscal year beginning after December 15, 2019, and interim periods within those fiscal years, with early adoption permitted. The guidance requires that implementation costs related to a hosting arrangement that is a service contract be capitalized and amortized over the term of the hosting arrangement, starting when the module or component of the hosting arrangement is ready for its intended use. The guidance will be applied retrospectively to each period presented. We do not expect the implementation to have a material impact on our condensed consolidated financial statements. In January 2018, the FASB issued ASU No. 2018-02, "Income Statement — Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income ("AOCI"), which is effective for fiscal years beginning after December 15, 2018 and interim periods therein, with early adoption permitted. The guidance gives entities the option to reclassify to retained earnings the tax effects resulting from the Tax Cuts and Jobs Act ("TCJA") related to items in AOCI. The new guidance may be applied retrospectively to each period in which the effect of TCJA is recognized in the period of adoption. We do not expect the implementation to have a material impact on our condensed consolidated financial statements.

Revenue Recognition Disaggregat

Revenue Recognition Disaggregation of Revenue (Tables)	6 Months Ended
	Mar. 31, 2019
Disaggregation of Revenue [Abstract]
Disaggregation of Revenue [Table Text Block]	For the Three Months Ended March 31, 2019 Hosting and professional services Product and licensing Maintenance and support Total Healthcare $ 125,867 $ 41,708 $ 36,829 $ 204,404 Enterprise 76,674 14,774 23,994 115,442 Automotive 33,584 39,317 98 72,999 Other 14,986 1,744 8 16,738 Total revenues $ 251,111 $ 97,543 $ 60,929 $ 409,583 For the Six Months Ended March 31, 2019 Hosting and professional services Product and licensing Maintenance and support Total Healthcare $ 259,382 $ 134,737 $ 82,150 $ 476,269 Enterprise 155,216 35,053 54,625 244,894 Automotive 65,455 81,425 98 146,978 Other 30,646 4,325 125 35,096 Total revenues $ 510,699 $ 255,540 $ 136,998 $ 903,237

Revenue Recognition Contract As

Revenue Recognition Contract Assets (Tables)	6 Months Ended
	Mar. 31, 2019
Contract Assets [Abstract]
Contract with Customer, Asset and Liability [Table Text Block]	The table below shows significant changes in deferred revenue of continuing operations (dollars in thousands): Deferred revenue Balance as of October 1, 2018 $ 693,272 Amounts bill but not recognized 506,225 Revenue recognized (484,314 ) Balance at March 31, 2019 $ 715,183 The table below shows significant changes in contract assets of continuing operations (dollars in thousands): Contract assets Balance as of October 1, 2018 $ 168,595 Revenues recognized but not billed 156,541 Amounts reclassified to accounts receivable (164,483 ) Balance at March 31, 2019 $ 160,653

Revenue Recognition Contract Li

Revenue Recognition Contract Liability (Tables)	6 Months Ended
	Mar. 31, 2019
Contract Liability [Abstract]
Contract with Customer, Asset and Liability [Table Text Block]	The table below shows significant changes in deferred revenue of continuing operations (dollars in thousands): Deferred revenue Balance as of October 1, 2018 $ 693,272 Amounts bill but not recognized 506,225 Revenue recognized (484,314 ) Balance at March 31, 2019 $ 715,183 The table below shows significant changes in contract assets of continuing operations (dollars in thousands): Contract assets Balance as of October 1, 2018 $ 168,595 Revenues recognized but not billed 156,541 Amounts reclassified to accounts receivable (164,483 ) Balance at March 31, 2019 $ 160,653

Revenue Recognition Remaining P

Revenue Recognition Remaining Performance Obligations (Tables)	6 Months Ended
	Mar. 31, 2019
Remaining Performance Obligations [Abstract]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block]	Remaining Performance Obligations The following table includes estimated revenue expected to be recognized in the future related to performance obligations that are unsatisfied or partially unsatisfied at March 31, 2019 (dollars in thousands): Within One Year Two to Five Years Greater than Five years Total Total revenue $ 748,526 $ 1,138,447 $ 112,907 $ 1,999,880 The table above includes fixed backlogs and does not include variable backlog derived from continent usage-based activities, such as royalties and usage-based hosting revenue.

Disposition of Business (Tables

Disposition of Business (Tables)	6 Months Ended
	Mar. 31, 2019
Results of Operations, Discontinued Operations [Abstract]
Disposal Groups, Including Discontinued Operations [Table Text Block]	The following table summarizes the results of the discontinued operations (dollars in thousands): Three Months Ended March 31, Six Months Ended March 31, 2019 2018 2019 2018 (ASC 606) (ASC 605) (ASC 606) (ASC 605) Major line items constituting net income of Imaging: Revenue (a) $ 15,435 $ 48,031 $ 67,430 $ 102,452 Cost of revenue 4,942 11,968 16,946 24,924 Research and development 2,041 7,487 7,557 14,767 Sales and marketing (a) 10,243 19,330 28,433 40,730 General and administrative 766 1,105 1,997 2,224 Amortization of intangible assets 1,305 4,273 5,219 8,496 Acquisition-related costs, net — — (386 ) — Restructuring and other charges, net 4,791 67 13,251 1,299 Other — 162 — 162 (Loss) income from discontinued operations before income taxes (a) (8,653 ) 3,639 (5,587 ) 9,850 (Benefit) provision for income taxes (4,363 ) 551 (2,688 ) 999 Gain on disposition 102,371 — 102,371 — Net income from discontinued operations $ 98,081 $ 3,088 $ 99,472 $ 8,851 Supplemental information: Depreciation $ 97 $ 333 $ 391 $ 750 Amortization $ 1,643 $ 5,995 $ 6,569 $ 12,060 Stock compensation $ 5,001 $ 2,007 $ 7,103 $ 3,768 Capital expenditures for all periods presented were de minimis. (a) As more fully described in Note 2, as a result of the adoption of ASC 606 using the modified retrospective approach, revenue for the three and six months ended March 31, 2019 reflects an increase of $0.8 million and $2.4 million , respectively, due to the upfront recognition of term licenses and the re-allocation of contract consideration to performance obligations based upon standalone selling prices; sales and marketing expense for the three and six months ended March 31, 2019 reflects a decrease of $0.1 million and $1.4 million , respectively, due to the capitalization and amortization of commission expense; and the provision for income taxes for the three and six months ended March 31, 2019 reflects an increase in tax benefit of $2.7 million and $1.6 million , respectively, related to the tax effect of the ASC 606 adjustments. The following table summarizes the assets and liabilities included within discontinued operations (dollars in thousands): September 30, (ASC 605) Major classes of Imaging assets: Accounts receivable, net $ 30,959 Prepaid expenses and other current assets 3,443 Land, building and equipment, net 2,442 Goodwill 257,352 Intangible assets, net 99,507 Other assets 196 Total assets classified as held for sale $ 393,899 Major classes of Imaging liabilities: Accounts payable $ 3,604 Accrued expenses and other current liabilities 12,304 Deferred revenue 107,965 Other liabilities 2,658 Total liabilities classified as held for sale $ 126,531

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	6 Months Ended
	Mar. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Changes in Carrying Amount of Goodwill and Intangible Assets	The changes in the carrying amount of goodwill by reportable segment for the six months ended March 31, 2019 are as follows (dollars in thousands): Goodwill Healthcare Enterprise Automotive Other Total Balance as of September 30, 2018 $ 1,430,325 $ 683,347 $ 1,119,947 $ 13,486 $ 3,247,105 Purchase accounting adjustments 88 — (355 ) — (267 ) Effect of foreign currency translation (2,448 ) (2,406 ) (3,139 ) (435 ) (8,428 ) Balance at March 31, 2019 $ 1,427,965 $ 680,941 $ 1,116,453 $ 13,051 $ 3,238,410

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets Intangible Assets (Tables)	6 Months Ended
	Mar. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Finite-Lived Intangible Assets [Table Text Block]	The changes in the carrying amount of intangible assets for the six months ended March 31, 2019 are as follows (dollars in thousands): Intangible Assets Balance as of September 30, 2018 $ 450,001 Acquisitions 1,488 Amortization (52,735 ) Effect of foreign currency translation (442 ) Balance at March 31, 2019 $ 398,312 Fiscal Year 2018 Interim Impairment Analysis Effective the second quarter of fiscal year 2018, our Automotive business, which was previously included within our Mobile segment, became a standalone operating segment. As a result of the reorganization, the original Mobile reporting unit was separated into three discrete lines of business comprised of Automotive, Dragon TV, and Devices. Dragon TV was merged within our Enterprise segment, and Devices was included within Other segment. We assigned $1,080.5 million , $12.0 million , and $36.0 million of goodwill to Automotive, Dragon TV and Devices, respectively, based on their relative fair values as of March 31, 2018, and assessed the assigned goodwill for impairment by comparing each component’s fair value to its carrying amount. As a result, we recorded a goodwill impairment charge of $35.1 million related to Devices for the second quarter of fiscal 2018. Also during the second quarter of fiscal 2018, our Subscriber Revenue Services ("SRS") reporting unit, originally included within our Mobile operating segment, recorded significantly lower revenue and profitability due to recent market disruptions in certain markets that we serve. We concluded that these financial results coupled with the rapid market shifts being experienced in the industry were factors that represented impairment indicators, triggering a review of goodwill and indefinite-lived intangible assets for impairment during the second quarter of fiscal 2018. Based on the result of the impairment assessment, the carrying value of SRS exceeded its fair value by $94.3 million . In addition, we recorded an $8.5 million deferred tax benefit related to SRS’s goodwill, which is amortized over time for tax purposes, and therefore increased the impairment charge by the same amount. As a result, we recorded a goodwill impairment charge of $102.8 million related to SRS for the second quarter of fiscal 2018. After the impairment charge, goodwill assigned to SRS was $17.8 million as of March 31, 2018. The assessment did not result in any impairment charge of other intangible assets. Wind-down of Devices and Mobile Operator Services and Annual Goodwill Impairment Analysis During the fourth quarter of fiscal 2018, in connection with our strategic business review announced in our earnings release issued on May 9, 2018, we restructured our SRS business by separating the voicemail transcription services business (“Voice-to-Text”), which will continue to operate as part of the Other Segment, and commenced a wind-down of our SRS Mobile Operator Services in India and Brazil, and our Devices businesses. The SRS business provides value-added services to mobile operators in India and Brazil ("Mobile Operator Services"). As a result, we revised our multi-year operating plans of Mobile Operator Services and Devices businesses, as part of our fiscal 2019 budgeting process, to reflect a significant decline in revenue and operating income. The wind-down decision has resulted in significantly lower estimated future cash flows over a considerably shorter time horizon, which triggered a review of goodwill and long-lived asset groups for impairment. As a result of the impairment review, we recorded an additional $15.0 million impairment charge for Devices for the fourth quarter of fiscal year 2018, including $7.6 million related to acquired trade names and customer relationships, $0.8 million related to acquired technology assets, $6.2 million related to fixed assets, and $0.4 million related to its remaining goodwill; we also recorded $25.1 million impairment charge for our Mobile Operator Services business for the fourth quarter of fiscal year 2018, including $12.9 million related to acquired trade names and customer relationships, $7.9 million related to acquired technology assets, $0.9 million related to fixed assets, and $3.4 million related to goodwill.

Financial Instruments and Hed_2

Financial Instruments and Hedging Activities (Tables)	6 Months Ended
	Mar. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Quantitative Summary of Fair Value of Derivative Instruments	A summary of the derivative instruments is as follows (dollars in thousands): Derivatives Not Designated as Hedges Balance Sheet Classification Fair Value March 31, September 30, Foreign currency forward contracts Prepaid expenses and other current assets $ 689 $ 143 Foreign currency forward contracts Accrued expenses and other current liabilities (350 ) (1,192 )
Summarized Activity of Derivative Instruments	A summary of income (loss) related to the derivative instruments for the three and six months ended March 31, 2019 and 2018 is as follows (dollars in thousands): Income Statement Classification Three Months Ended March 31, Six Months Ended March 31, Derivatives Not Designated as Hedges Income (loss) recognized 2019 2018 2019 2018 Foreign currency forward contracts Other income (expense), net $ 2,170 $ (785 ) $ 440 $ (1,182 )

Fair Value Measures (Tables)

Fair Value Measures (Tables)	6 Months Ended
	Mar. 31, 2019
Fair Value Disclosures [Abstract]
Assets and Liabilities Measured at Fair Value on Recurring Basis	Assets and liabilities measured at fair value on a recurring basis at March 31, 2019 and September 30, 2018 consisted of the following (dollars in thousands): March 31, 2019 Level 1 Level 2 Level 3 Total Assets: Money market funds (a) $ 380,124 $ — $ — $ 380,124 Time deposits (b) — 97,225 — 97,225 Commercial paper, $37,852 at cost (b) — 38,061 — 38,061 Corporate notes and bonds, $46,694 at cost (b) — 46,686 — 46,686 Foreign currency exchange contracts (b) — 689 — 689 Total assets at fair value $ 380,124 $ 182,661 $ — $ 562,785 Liabilities: Foreign currency exchange contracts (b) $ — $ (350 ) $ — $ (350 ) Contingent acquisition payments (c) — — (1,450 ) (1,450 ) Total liabilities at fair value $ — $ (350 ) $ (1,450 ) $ (1,800 ) September 30, 2018 Level 1 Level 2 Level 3 Total Assets: Money market funds (a) $ 200,004 $ — $ — $ 200,004 Time deposits (b) — 88,158 — 88,158 Commercial paper, $27,194 at cost (b) — 27,363 — 27,363 Corporate notes and bonds, $57,563 at cost (b) — 57,417 — 57,417 Foreign currency exchange contracts (b) — 143 — 143 Total assets at fair value $ 200,004 $ 173,081 $ — $ 373,085 Liabilities: Foreign currency exchange contracts (b) $ — $ (1,192 ) $ — $ (1,192 ) Contingent acquisition payments (c) — — (4,000 ) (4,000 ) Total liabilities at fair value $ — $ (1,192 ) $ (4,000 ) $ (5,192 )
Changes in Fair Value of Contingent Earn-Out Liabilities	The following table provides a summary of changes in the aggregate fair value of the contingent acquisition payments for all periods presented (dollars in thousands): Three Months Ended March 31, Six Months Ended March 31, 2019 2018 2019 2018 Balance at beginning of period $ 3,979 $ 10,431 $ 4,000 $ 8,648 Earn-out liabilities established at time of acquisition — — — 500 Payments and foreign currency translation (2,529 ) (79 ) (2,550 ) (96 ) Adjustments to fair value included in acquisition-related costs, net — 1,400 — 2,700 Balance at end of period $ 1,450 $ 11,752 $ 1,450 $ 11,752

Accrued Expenses and Other Cu_2

Accrued Expenses and Other Current Liabilities (Tables)	6 Months Ended
	Mar. 31, 2019
Payables and Accruals [Abstract]
Accrued Expenses and Other Current Liabilities	Accrued expenses and other current liabilities consisted of the following (dollars in thousands): March 31, September 30, Compensation $ 105,664 $ 174,984 Cost of revenue related liabilities 42,355 30,432 Consulting and professional fees 17,847 21,220 Accrued interest payable 19,304 21,326 Sales and other taxes payable 5,483 5,983 Facility-related liabilities 4,378 4,621 Sales and marketing incentives 2,434 1,889 Other 14,006 8,884 Total $ 211,471 $ 269,339

Restructuring and Other Charg_2

Restructuring and Other Charges, net (Tables)	6 Months Ended
	Mar. 31, 2019
Restructuring and Related Activities [Abstract]
Accrual Activity Relating to Restructuring and Other Charges	The following table sets forth accrual activities relating to restructuring reserves for the six months ended March 31, 2019 (dollars in thousands): Personnel Facilities Total Balance at September 30, 2018 $ 9,690 $ 6,503 $ 16,193 Restructuring charges, net 18,428 2,151 20,579 Non-cash adjustment — 504 504 Cash payments (18,042 ) (4,643 ) (22,685 ) Balance at March 31, 2019 $ 10,076 $ 4,515 $ 14,591
Restructuring and Other Charges, Net by Segment	Six Months Ended March 31, 2019 2018 Personnel Facilities Total Restructuring Other Charges Total Personnel Facilities Total Restructuring Other Charges Total Healthcare $ 4,450 $ 141 $ 4,591 $ — $ 4,591 $ 3,301 $ 25 $ 3,326 $ — $ 3,326 Enterprise 5,251 13 5,264 — 5,264 527 2,367 2,894 — 2,894 Automotive 5,863 1,675 7,538 12,513 20,051 1,000 — 1,000 — 1,000 Other 914 — 914 3,067 3,981 1,344 569 1,913 — 1,913 Corporate 1,950 322 2,272 8,391 10,663 1,192 58 1,250 12,067 13,317 Total $ 18,428 $ 2,151 $ 20,579 $ 23,971 $ 44,550 $ 7,364 $ 3,019 $ 10,383 $ 12,067 $ 22,450

Debt and Credit Facilities (Tab

Debt and Credit Facilities (Tables)	6 Months Ended
	Mar. 31, 2019
Debt Disclosure [Abstract]
Schedule of Maturities of Long-term Debt [Table Text Block]	The following table summarizes the maturities of our borrowing obligations as of March 31, 2019 (dollars in thousands): Fiscal Year Convertible Debentures (1) Senior Notes Total 2019 $ — $ — $ — 2020 — — — 2021 — — — 2022 310,463 — 310,463 2023 676,488 — 676,488 Thereafter 350,000 800,000 1,150,000 Total before unamortized discount 1,336,951 800,000 2,136,951 Less: unamortized discount and issuance costs (218,674 ) (7,092 ) (225,766 ) Total long-term debt $ 1,118,277 $ 792,908 $ 1,911,185 (1) Pursuant to the terms of each convertible instrument, holders have the right to redeem the debt on specific dates prior to maturity. The repayment schedule above assumes that payment is due on the next redemption date after March 31, 2019 .
Borrowing Obligations and Applicable Margin for Borrowings	As of March 31, 2019 and September 30, 2018 , we had the following borrowing obligations (dollars in thousands): March 31, September 30, 5.625% Senior Notes due 2026, net of deferred issuance costs of $4.8 million and $5.1 million, respectively. Effective interest rate 5.625%. $ 495,210 $ 494,915 5.375% Senior Notes due 2020, net of deferred issuance costs of $1.2 million, respectively. Effective interest rate 5.375%. — 298,759 6.000% Senior Notes due 2024, net of deferred issuance costs of $1.6 million and $1.8 million, respectively. Effective interest rate 6.000%. 298,375 298,220 1.00% Convertible Debentures due 2035, net of unamortized discount of $104.4 million and $116.9 million, respectively, and deferred issuance costs of $4.9 million and $5.6 million, respectively. Effective interest rate 5.622%. 567,128 553,973 2.75% Convertible Debentures due 2031. Effective interest rate 7.432%. 46,568 46,568 1.25% Convertible Debentures due 2025, net of unamortized discount of $77.1 million and $82.4 million, respectively, and deferred issuance costs of $3.4 million and $3.7 million, respectively. Effective interest rate 5.578%. 269,485 263,863 1.50% Convertible Debentures due 2035, net of unamortized discount of $27.8 million and $32.8 million, respectively, and deferred issuance costs of $1.0 million and $1.1 million, respectively. Effective interest rate 5.394%. 235,096 229,906 Deferred issuance costs related to our Revolving Credit Facility (677 ) (843 ) Total debt 1,911,185 2,185,361 Less: current portion — — Total long-term debt $ 1,911,185 $ 2,185,361

Net Income (Loss) Per Share (Ta

Net Income (Loss) Per Share (Tables)	6 Months Ended
	Mar. 31, 2019
Net Income (Loss) per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]	The following table sets forth the computation for basic and diluted net income (loss) per share (in thousands, except per share amounts): Three Months Ended March 31, Six Months Ended March 31, 2019 2018 2019 2018 Numerator: Net loss from continuing operations $ (20,749 ) $ (167,141 ) $ (3,050 ) $ (119,676 ) Net income from discontinued operations 98,081 3,088 99,472 8,851 Net income (loss) $ 77,332 $ (164,053 ) $ 96,422 $ (110,825 ) Denominator: Weighted average common shares outstanding — basic 285,866 294,103 286,849 292,720 Dilutive effect of employee stock compensation plans — — — — Weighted average common shares outstanding — diluted 285,866 294,103 286,849 292,720 Net income (loss) per common share - basic: Continuing operations $ (0.07 ) $ (0.57 ) $ (0.01 ) $ (0.41 ) Discontinued operations 0.34 0.01 0.35 0.03 Total net income (loss) per basic common share $ 0.27 $ (0.56 ) $ 0.34 $ (0.38 ) Net income (loss) per common share - diluted: Continuing operations $ (0.07 ) $ (0.57 ) $ (0.01 ) $ (0.41 ) Discontinued operations 0.34 0.01 0.35 0.03 Total net income (loss) per diluted common share $ 0.27 $ (0.56 ) $ 0.34 $ (0.38 ) Anti-dilutive equity instruments excluded from the calculation 460 2,679 635 4,178 Contingently issuable awards excluded from the calculation (a) 2,646 2,836 2,422 2,387

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	6 Months Ended
	Mar. 31, 2019
Share-based Compensation [Abstract]
Stock Based Compensation Included in Consolidated Statements of Operations	The amounts included in the condensed consolidated statements of operations related to stock-based compensation are as follows (dollars in thousands): Three Months Ended March 31, Six Months Ended March 31, 2019 2018 2019 2018 Cost of hosting and professional services $ 5,481 $ 6,306 $ 12,813 $ 13,684 Cost of product and licensing 132 112 396 378 Cost of maintenance and support 381 538 147 1,219 Research and development 7,820 7,757 16,650 16,764 Sales and marketing 7,638 7,372 16,895 17,536 General and administrative 8,419 9,657 17,310 18,386 Total $ 29,871 $ 31,742 $ 64,211 $ 67,967
Summary of Stock Options Activity	The table below summarizes activities related to stock options for the six months ended March 31, 2019 : Number of Shares Weighted Average Exercise Price Weighted Average Remaining Contractual Term Aggregate Intrinsic Value (a) Outstanding at September 30, 2018 19,144 $ 17.31 Exercised (1,500 ) $ 12.79 Expired (4,528 ) $ 17.89 Outstanding at March 31, 2019 13,116 $ 17.63 2.9 years $ 0.1 million Exercisable at March 31, 2019 13,116 $ 17.63 2.9 years $ 0.1 million Exercisable at March 31, 2018 21,939 $ 16.41 2.6 years $ 0.1 million (a) The aggregate intrinsic value in this table represents any excess of the closing market price of our common stock as of March 31, 2019 ( $16.93 ) over the exercise price of the underlying options.
Summary of Activity Relating to Restricted Units and Restricted Stock Awards	he table below summarizes activities relating to restricted units for the six months ended March 31, 2019 : Number of Shares Underlying Restricted Units — Contingent Awards Number of Shares Underlying Restricted Units — Time-Based Awards Outstanding at September 30, 2018 3,039,568 6,872,087 Granted 1,332,963 5,913,256 Earned/released (1,366,735 ) (4,594,896 ) Modification (a) (296,759 ) 296,759 Forfeited (613,805 ) (937,614 ) Outstanding March 31, 2019 2,095,232 7,549,592 Weighted average remaining recognition period of outstanding restricted units 1.9 years 1.7 years Unrecognized stock-based compensation expense of outstanding restricted units $30.4 million $71.2 million Aggregate intrinsic value of outstanding restricted units (b) $40.2 million $123.3 million (a) 296,759 shares of contingently issuable awards with market conditions were modified to time-based awards with only service conditions in December 2018. (b) The aggregate intrinsic value in this table represents any excess of the closing market price of our common stock as of March 31, 2019 ( $16.93 ) over the purchase price of the underlying restricted units.
Summary of Weighted-Average Grant-Date Fair Value and Intrinsic Value of Restricted Units and Restricted Stock Awards Vested	A summary of the weighted-average grant-date fair value of restricted units granted, and the aggregate intrinsic value of restricted units vested during the periods noted is as follows: Six Months Ended March 31, 2019 2018 Weighted-average grant-date fair value per share $ 16.35 $ 15.67 Total intrinsic value of shares vested (in millions) $ 95.2 $ 94.0

Income Taxes (Tables)

Income Taxes (Tables)	6 Months Ended
	Mar. 31, 2019
Income Tax Disclosure [Abstract]
Components of Benefit from Income Taxes	The components of loss from continuing operations before income taxes are as follows (dollars in thousands): Three Months Ended March 31, Six Months Ended March 31, 2019 2018 2019 2018 Domestic $ (35,351 ) $ (80,758 ) $ (15,563 ) $ (119,867 ) Foreign 13,644 (84,390 ) 12,541 (76,785 ) Loss before income taxes $ (21,707 ) $ (165,148 ) $ (3,022 ) $ (196,652 ) The components of (benefit) provision for income taxes are as follows (dollars in thousands): Three Months Ended March 31, Six Months Ended March 31, 2019 2018 2019 2018 Domestic $ (5,272 ) $ 6,989 $ (5,719 ) $ (90,143 ) Foreign 4,314 (4,996 ) 5,747 13,167 (Benefit) provision for income taxes $ (958 ) $ 1,993 $ 28 $ (76,976 ) Effective tax rate 4.4 % (1.2 )% (0.9 )% 39.1 %

Segment and Geographic Inform_2

Segment and Geographic Information and Significant Customers (Tables)	6 Months Ended
	Mar. 31, 2019
Segment Reporting [Abstract]
Segment Results Along with Reconciliation of Segment Profit to Income Before Income Taxes	The following table presents segment results along with a reconciliation of segment profit to Loss before income taxes (dollars in thousands): Three Months Ended Six Months Ended March 31, March 31, 2019 2018 2019 2018 Segment revenues : (ASC 606) (ASC 605) (ASC 606) (ASC 605) Healthcare $ 204,549 $ 261,240 $ 476,527 $ 506,775 Enterprise 115,637 112,667 245,329 233,266 Automotive 74,242 68,950 149,424 130,448 Other 16,737 26,524 35,095 52,087 Total segment revenues 411,165 469,381 906,375 922,576 Less: acquisition-related revenues adjustments (1,582 ) (3,188 ) (3,138 ) (9,159 ) Total revenues 409,583 466,193 903,237 913,417 Segment profit: Healthcare 63,136 86,235 167,058 162,462 Enterprise 23,549 25,288 68,195 62,565 Automotive 26,580 28,719 45,965 51,745 Other 5,639 6,013 11,441 9,331 Total segment profit 118,904 146,255 292,659 286,103 Corporate expenses and other, net (32,435 ) (63,508 ) (68,057 ) (107,079 ) Acquisition-related revenues (1,582 ) (3,188 ) (3,138 ) (9,159 ) Stock-based compensation (29,871 ) (31,742 ) (64,211 ) (67,967 ) Amortization of intangible assets (26,004 ) (31,455 ) (52,735 ) (63,810 ) Acquisition-related costs, net (2,233 ) (2,360 ) (5,069 ) (7,921 ) Restructuring and other charges, net (21,469 ) (8,881 ) (44,550 ) (22,450 ) Impairment of goodwill — (137,907 ) — (137,907 ) Other expenses, net (27,017 ) (32,362 ) (57,921 ) (66,462 ) Loss before income taxes $ (21,707 ) $ (165,148 ) $ (3,022 ) $ (196,652 )
Classification of Revenue By Major Geographic Areas	Revenues, classified by the major geographic areas in which our customers are located, were as follows (dollars in thousands): Three Months Ended Six Months Ended March 31, March 31, 2019 2018 2019 2018 (ASC 606) (ASC 605) (ASC 606) (ASC 605) United States $ 299,101 $ 342,003 $ 682,533 $ 680,486 International 110,482 124,190 220,704 232,931 Total revenues $ 409,583 $ 466,193 $ 903,237 $ 913,417

Supplemental Cash Flow (Tables)

Supplemental Cash Flow (Tables)	6 Months Ended
	Mar. 31, 2019
Supplemental Cash Flow [Abstract]
Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]	Cash paid for Interest and Income Taxes: Three Months Ended March 31, Six Months Ended March 31, 2019 2018 2019 2018 (Dollars in thousands) Interest paid $ 9,186 $ 21,427 $ 40,754 $ 48,708 Income taxes paid $ 4,407 $ 4,233 $ 7,214 $ 8,833

Summary of Significant Accoun_3

Summary of Significant Accounting Policies Recently Adopted Accounting Standards (Details) - USD ($) $ in Thousands	Oct. 01, 2018	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018	Sep. 30, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Accounts Receivable, Net, Current		$ 292,567		$ 292,567		$ 347,873
Prepaid expenses and other current assets		171,717		171,717		94,814
Other assets		255,928		255,928		141,761
Deferred Revenue, Current		300,746		300,746		330,689
Deferred revenue, net of current portion		414,437		414,437		434,316
Deferred tax liabilities		51,656		51,656		49,931
Other liabilities		103,214		103,214		93,593
Hosting and professional services		251,111	$ 273,449	510,699	$ 531,428
Product and licensing		97,543	130,446	255,540	255,194
Maintenance and support		60,929	62,298	136,998	126,795
Revenues		409,583	466,193	903,237	913,417
Hosting Cost		153,637	180,257	316,807	351,784
Product and licensing		9,940	14,126	42,690	27,898
Cost of Sales, Maintenance and Support		8,966	9,579	16,727	19,004
Amortization of intangible assets		9,048	13,058	18,805	26,572
Cost of Goods and Services Sold		181,591	217,020	395,029	425,258
Sales and marketing		75,755	74,857	151,114	155,417
(Benefit) provision for income taxes		(958)	$ 1,993	28	$ (76,976)
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets	$ 233,000
Accumulated deficit		(411,000)		(411,000)		$ (740,837)
Deferred Revenue [Domain]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	70,000
Other Assets [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	180,000
Accounts Receivable [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	30,000			27,293
Deferred Project Costs [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	30,000
Deferred Tax Asset [Domain]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	$ 20,000			9,923
Prepaid Expenses and Other Current Assets [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification				(39,059)
Other Assets [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification				(135,321)
Deferred revenue, current [Domain]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification				56,065
Deferred Revenue [Domain]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification				16,154
Other Noncurrent Liabilities [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification				(11,557)
Retained Earnings [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification				(198,019)
ASC 605
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Accounts Receivable, Net, Current		319,860		319,860
Prepaid expenses and other current assets		132,658		132,658
Other assets		120,607		120,607
Deferred Revenue, Current		356,811		356,811
Deferred revenue, net of current portion		430,591		430,591
Deferred tax liabilities		41,733		41,733
Other liabilities		91,657		91,657
Hosting and professional services		264,311		531,935
Product and licensing		124,194		259,463
Maintenance and support		60,500		121,239
Revenues		449,005		912,637
Hosting Cost		154,322		313,554
Product and licensing		16,525		31,245
Cost of Sales, Maintenance and Support		8,247		16,774
Cost of Goods and Services Sold		188,142		380,378
Sales and marketing		73,653		150,534
(Benefit) provision for income taxes		10,131		10,707
Accumulated deficit		(609,019)		(609,019)
Cost of professional services and hosting
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification		13,200		21,236
Cost of product and licensing
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification		26,651		3,923
Cost of maintenance and support
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification		(429)		(15,759)
Sales Revenue, Net [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification		39,422		9,400
Cost, professional services and hosting [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification		685		(3,253)
Cost, product and licensing [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification		6,585		(11,445)
Cost, maintenance and support [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification		(719)		47
Cost, amortization [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification		0		0
Cost of Sales [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification		6,551		(14,651)
Sales and marketing
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification		(2,102)		(580)
Provision (benefit) for income taxes [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification		$ 11,089		$ 10,679

Revenue Recognition Disaggreg_2

Revenue Recognition Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Hardware revenue	$ 7,100		$ 17,200
Document Period End Date			Mar. 31, 2019
Hosting Revenue	251,111	$ 273,449	$ 510,699	$ 531,428
Product and licensing	97,543	130,446	255,540	255,194
Revenue, Maintenance and Support	60,929	62,298	136,998	126,795
Revenues	409,583	$ 466,193	903,237	$ 913,417
Health Care Segment [Member]
Disaggregation of Revenue [Line Items]
Hosting Revenue	125,867		259,382
Product and licensing	41,708		134,737
Revenue, Maintenance and Support	36,829		82,150
Revenues	204,404		476,269
Enterprise Segment [Member]
Disaggregation of Revenue [Line Items]
Hosting Revenue	76,674		155,216
Product and licensing	14,774		35,053
Revenue, Maintenance and Support	23,994		54,625
Revenues	115,442		244,894
Automotive Segment [Member]
Disaggregation of Revenue [Line Items]
Hosting Revenue	33,584		65,455
Product and licensing	39,317		81,425
Revenue, Maintenance and Support	98		98
Revenues	72,999		146,978
Other Segments [Member]
Disaggregation of Revenue [Line Items]
Hosting Revenue	14,986		30,646
Product and licensing	1,744		4,325
Revenue, Maintenance and Support	8		125
Revenues	$ 16,738		$ 35,096

Revenue Recognition Contract _2

Revenue Recognition Contract Assets (Details) $ in Thousands	6 Months Ended
	Mar. 31, 2019USD ($)
Contract Assets [Abstract]
Revenues recognized but not billed	$ 156,541
Amounts reclassified to accounts receivable	(164,483)
Balance at March 31, 2019	$ 160,653

Revenue Recognition Contract _3

Revenue Recognition Contract Liability (Details) $ in Thousands	6 Months Ended
	Mar. 31, 2019USD ($)
Contract Liability [Abstract]
Amounts bill but not recognized	$ 506,225
Revenue recognized	(484,314)
Balance at March 31, 2019	$ 715,183

Revenue Recognition Remaining_2

Revenue Recognition Remaining Performance Obligations (Details) $ in Thousands	Mar. 31, 2019USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 1,999,880
Within One Year [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	748,526
Two to Five Years [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	1,138,447
Greater than Five Years [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 112,907

Revenue Recognition Revenue R_2

Revenue Recognition Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2019	Mar. 31, 2019	Oct. 01, 2018
Revenue Recognition [Abstract]
Contract with Customer, Asset, Net, Current	$ 59,800	$ 59,800
Deferred Costs, Current	13,400	13,400
Contract with Customer, Liability	715,183	715,183	$ 693,272
Capitalized Contract Cost, Net	17,700	17,700
Hardware revenue	7,100	17,200
Capitalized Contract Cost, Net, Noncurrent	27,800	27,800
Capitalized Contract Cost, Amortization	3,700	7,200
Deferred Costs, Noncurrent	96,200	96,200
Contract with Customer, Asset, Net, Noncurrent	$ 100,800	$ 100,800

Disposition of Business (Detail

Disposition of Business (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018	Feb. 01, 2019	Nov. 07, 2018	Sep. 30, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Document Period End Date			Mar. 31, 2019
Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net							$ 30,959
Provision for Income Taxes, Discontinued Operations	$ (4,363)	$ 551	$ (2,688)	$ 999
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	98,081	3,088	99,472	8,851
Depreciation, Discontinued Operations	97	333	391	750
Disposal Group, Including Discontinued Operation, Depreciation and Amortization	1,643	5,995	6,569	12,060
Stock Compensation Expense, Discontinued Operations	5,001	2,007	7,103	3,768
Disposal Group, Including Discontinued Operation, Prepaid and Other Assets							3,443
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment							2,442
Disposal Group, Including Discontinued Operation, Goodwill							257,352
Disposal Group, Including Discontinued Operation, Intangible Assets							99,507
Disposal Group, Including Discontinued Operation, Other Assets							196
Disposal Group, Including Discontinued Operation, Assets							393,899
Disposal Group, Including Discontinued Operation, Accounts Payable							3,604
Disposal Group, Including Discontinued Operation, Accrued Liabilities							12,304
Disposal Group, Including Discontinued Operation, Deferred Revenue							107,965
Disposal Group, Including Discontinued Operation, Revenue	15,435	48,031	67,430	102,452
Disposal Group, Including Discontinued Operation, Consideration					$ 404,000	$ 400,000
Disposal Group, Including Discontinued Operation, Costs of Goods Sold	4,942	11,968	16,946	24,924
Disposal Group, Including Discontinued Operation, Operating Income (Loss)	(8,653)	3,639	(5,587)	9,850
Disposal Group, Including Discontinued Operation, Other Liabilities							2,658
Disposal Group, Including Discontinued Operation, Liabilities							$ 126,531
Gain (Loss) on Disposition of Business	102,371	0	102,371	0
Restructuring Charges [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Operating Expense	4,791	67	13,251	1,299
Other Expenses	0	162	0	162
Acquisition-related Costs [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Operating Expense	0	0	(386)	0
Other Expense [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Operating Expense	1,305	4,273	5,219	8,496
General and Administrative Expense
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Operating Expense	766	1,105	1,997	2,224
Sales and marketing
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Operating Expense	10,243	19,330	28,433	40,730
Research and Development
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Operating Expense	$ 2,041	$ 7,487	$ 7,557	$ 14,767

Business Acquisitions (Summary

Business Acquisitions (Summary of Preliminary Allocation of Purchase Consideration) (Detail) - USD ($) $ in Millions	6 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Business Combinations [Abstract]
Business Combination, Consideration Transferred	$ 8.7
Business Combination, Contingent Consideration, Liability		$ 0.5
Goodwill, Acquired During Period	6.8
Finite-lived Intangible Assets Acquired	$ 2
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	2 years

Business Acquisitions (Componen

Business Acquisitions (Components of Acquisition-Related Costs, Net) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Business Acquisition [Line Items]
Document Period End Date			Mar. 31, 2019
Transition and integration costs	$ 2,228	$ 3,367	$ 5,092	$ 7,429
Business Combination Professional Service Fees	378	940
Professional service fees			456	1,451
Business Combination Acquisition Related Adjustments	(373)	(1,947)
Acquisition-related adjustments			(479)	(959)
Total	$ 2,233	$ 2,360	$ 5,069	$ 7,921

Goodwill and Intangible Asset_3

Goodwill and Intangible Assets Goodwill, Changes in Carrying values (Details) - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Goodwill [Line Items]
Document Period End Date	Mar. 31, 2019
Balance as of September 30, 2018	$ 3,247,105
Acquisitions		$ 6,800
Purchase accounting adjustments	(267)
Effect of foreign currency translation	(8,428)
Balance at March 31, 2019	3,238,410
Healthcare
Goodwill [Line Items]
Balance as of September 30, 2018	1,430,325
Purchase accounting adjustments	88
Effect of foreign currency translation	(2,448)
Balance at March 31, 2019	1,427,965
Enterprise
Goodwill [Line Items]
Balance as of September 30, 2018	683,347
Purchase accounting adjustments	0
Effect of foreign currency translation	(2,406)
Balance at March 31, 2019	680,941
Automotive
Goodwill [Line Items]
Balance as of September 30, 2018	1,119,947
Purchase accounting adjustments	(355)
Effect of foreign currency translation	(3,139)
Balance at March 31, 2019	1,116,453	$ 1,080,500
Other
Goodwill [Line Items]
Balance as of September 30, 2018	13,486
Purchase accounting adjustments	0
Effect of foreign currency translation	(435)
Balance at March 31, 2019	$ 13,051

Goodwill and Intangible Asset_4

Goodwill and Intangible Assets Intangible Assets (Details) - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Document Period End Date	Mar. 31, 2019
Balance as of September 30, 2018	$ 450,001
Acquisitions		$ 2,000
Amortization	(52,735)
Effect of foreign currency translation	(442)
Balance at March 31, 2019	398,312
Other Acquisitions [Member]
Finite-Lived Intangible Assets [Line Items]
Acquisitions	$ 1,488

Goodwill and Intangible Asset_5

Goodwill and Intangible Assets Goodwill Impairment Assessment (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended		9 Months Ended
	Mar. 31, 2019	Sep. 30, 2018	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018	Jun. 30, 2018
Goodwill	$ 3,238,410	$ 3,247,105		$ 3,238,410
Goodwill and Intangible Asset Impairment	0		$ 137,907	0	$ 137,907
Other Asset Impairment Charges				0	1,780
Automotive Segment [Member]
Goodwill	$ 1,116,453	1,119,947	1,080,500	$ 1,116,453	1,080,500
Dragon TV [Member]
Goodwill			12,000		12,000
Mobile Reporting Unit [Member]
Goodwill			36,000		36,000
Goodwill, Impairment Loss		400			35,100
Goodwill and Intangible Asset Impairment		15,000
Other Asset Impairment Charges		6,200
SRS [Member]
Goodwill			17,800		17,800
Goodwill, Impairment Loss		3,400			102,800
Fair Value, Net Asset (Liability)			$ 94,300		$ 94,300
Goodwill, Subsequent Recognition of Deferred Tax Asset						$ 8,500
Goodwill and Intangible Asset Impairment		25,100
Other Asset Impairment Charges		900
Customer Relationships [Member] | Mobile Reporting Unit [Member]
Impairment of Intangible Assets (Excluding Goodwill)		7,600
Customer Relationships [Member] | SRS [Member]
Impairment of Intangible Assets (Excluding Goodwill)		12,900
Patented Technology [Member] | Mobile Reporting Unit [Member]
Impairment of Intangible Assets (Excluding Goodwill)		800
Patented Technology [Member] | SRS [Member]
Impairment of Intangible Assets (Excluding Goodwill)		$ 7,900

Financial Instruments and Hed_3

Financial Instruments and Hedging Activities (Additional Information) (Detail) - Derivatives Not Designated as Hedges - USD ($) $ in Millions	6 Months Ended
	Mar. 31, 2019	Sep. 30, 2018
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Derivative, Notional Amount	$ 43.6	$ 117.1
Maximum
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Term of foreign currency forward contracts	90 days

Financial Instruments and Hed_4

Financial Instruments and Hedging Activities (Quantitative Summary of Fair Value of Derivative Instruments) (Detail) - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2019	Sep. 30, 2018
Derivatives, Fair Value [Line Items]
Document Period End Date	Mar. 31, 2019
Foreign currency forward contracts | Prepaid Expenses and Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	$ 689	$ 143
Foreign currency forward contracts | Accrued Expenses And Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value	$ 350	$ 1,192

Financial Instruments and Hed_5

Financial Instruments and Hedging Activities (Summarized Activity of Derivative Instruments) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Document Period End Date			Mar. 31, 2019
Derivatives Not Designated as Hedges | Foreign currency forward contracts | Other income (expense), net
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income	$ 2,170	$ (785)	$ 440	$ (1,182)

Fair Value Measures (Assets and

Fair Value Measures (Assets and Liabilities Measured at Fair Value on Recurring Basis) (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Sep. 30, 2018	Mar. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale Securities, Weighted Average Maturity	7 months 1 day	7 months 10 days
Document Period End Date			Mar. 31, 2019
Fair Value, Measurements, Recurring
Assets:
Money market funds	$ 380,124,000	$ 200,004,000	$ 380,124,000
Bank Time Deposits, Fair Value Disclosure	97,225,000	88,158,000	97,225,000
Commercial Paper, Fair value	38,061,000	27,363,000	38,061,000
Corporate notes and bonds, Fair Value	46,686,000	57,417,000	46,686,000
Foreign Currency Contract, Asset, Fair Value Disclosure	689,000	143,000	689,000
Total assets at fair value	562,785,000	373,085,000	562,785,000
Liabilities:
Contingent earn-out	(1,450,000)	(4,000,000)	(1,450,000)
Foreign Currency Contracts, Liability, Fair Value Disclosure	(350,000)	(1,192,000)	(350,000)
Total liabilities at fair value	(1,800,000)	(5,192,000)	(1,800,000)
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1
Assets:
Money market funds	380,124,000	200,004,000	380,124,000
Bank Time Deposits, Fair Value Disclosure	0	0	0
Commercial Paper, Fair value	0	0	0
Corporate notes and bonds, Fair Value	0	0	0
Foreign Currency Contract, Asset, Fair Value Disclosure	0	0	0
Total assets at fair value	380,124,000	200,004,000	380,124,000
Liabilities:
Contingent earn-out	0	0	0
Foreign Currency Contracts, Liability, Fair Value Disclosure	0	0	0
Total liabilities at fair value	0	0	0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Assets:
Money market funds	0	0	0
Bank Time Deposits, Fair Value Disclosure	97,225,000	88,158,000	97,225,000
Commercial Paper, Fair value	38,061,000	27,363,000	38,061,000
Corporate notes and bonds, Fair Value	46,686,000	57,417,000	46,686,000
Foreign Currency Contract, Asset, Fair Value Disclosure	689,000	143,000	689,000
Total assets at fair value	182,661,000	173,081,000	182,661,000
Liabilities:
Contingent earn-out	0	0	0
Foreign Currency Contracts, Liability, Fair Value Disclosure	(350,000)	(1,192,000)	(350,000)
Total liabilities at fair value	(350,000)	(1,192,000)	(350,000)
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3
Assets:
Money market funds	0	0	0
Bank Time Deposits, Fair Value Disclosure	0	0	0
Commercial Paper, Fair value	0	0	0
Corporate notes and bonds, Fair Value	0	0	0
Foreign Currency Contract, Asset, Fair Value Disclosure	0	0	0
Total assets at fair value	0	0	0
Liabilities:
Contingent earn-out	(1,450,000)	(4,000,000)	(1,450,000)
Foreign Currency Contracts, Liability, Fair Value Disclosure	0	0	0
Total liabilities at fair value	(1,450,000)	(4,000,000)	(1,450,000)
Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Amortized Cost Basis		57,563,000
Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Amortized Cost Basis		$ 27,194,000

Fair Value Measures (Changes in

Fair Value Measures (Changes in Fair Value of Contingent Earn-Out Liabilities) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Document Period End Date			Mar. 31, 2019
Balance at beginning of period	$ 3,979	$ 10,431	$ 4,000	$ 8,648
Earn-out liabilities established at time of acquisition	0	0	0	500
Payments and foreign currency translation	(2,529)	(79)	(2,550)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements				96
Adjustments to fair value included in acquisition-related costs, net	0	1,400	0	2,700
Balance at end of period	1,450	$ 11,752	1,450	$ 11,752
Contingent Consideration Payment, Higher End	$ 9,200		$ 9,200

Fair Value Measures Fair Value

Fair Value Measures Fair Value Measures - Additional Debt Details (Details) - USD ($) $ in Millions	Mar. 31, 2019	Sep. 30, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt, Fair Value	$ 2,114.3	$ 2,423.6
Debt Instrument, Face Amount	$ 2,137	$ 2,437

Accrued Expenses and Other Cu_3

Accrued Expenses and Other Current Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Sep. 30, 2018
Payables and Accruals [Abstract]
Compensation	$ 105,664	$ 174,984
Cost of revenue related liabilities	42,355	30,432
Sales and other taxes payable	17,847	21,220
Accrued interest payable	19,304	21,326
Facility-related liabilities	4,378	4,621
Sales and marketing incentives	2,434	1,889
Sales and other taxes payable	5,483	5,983
Other	14,006	8,884
Total	$ 211,471	$ 269,339

Restructuring and Other Charg_3

Restructuring and Other Charges, net (Accrual Activity Relating to Restructuring and Other Charges) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Restructuring [Roll Forward]
Balance at September 30, 2018			$ 16,193
Restructuring charges	$ 10,190	$ 5,067	20,579	$ 10,383
Restructuring Reserve, Accrual Adjustment			504
Cash payments			(22,685)
Balance at March 31, 2019	14,591		14,591
Personnel
Restructuring [Roll Forward]
Balance at September 30, 2018			9,690
Restructuring charges	9,945	3,704	18,428	7,364
Restructuring Reserve, Accrual Adjustment			0
Cash payments			(18,042)
Balance at March 31, 2019	10,076		10,076
Facilities
Restructuring [Roll Forward]
Balance at September 30, 2018			6,503
Restructuring charges	245	$ 1,363	2,151	$ 3,019
Restructuring Reserve, Accrual Adjustment			504
Cash payments			(4,643)
Balance at March 31, 2019	$ 4,515		$ 4,515

Restructuring and Other Charg_4

Restructuring and Other Charges, net (By Segment) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Restructuring Cost and Reserve [Line Items]
Document Period End Date			Mar. 31, 2019
Restructuring charges	$ (10,190)	$ (5,067)	$ (20,579)	$ (10,383)
Restructuring Charges and Other Expenses	21,469	8,881	44,550	22,450
Healthcare
Restructuring Cost and Reserve [Line Items]
Restructuring charges	(2,985)	(788)	(4,591)	(3,326)
Restructuring Charges and Other Expenses	2,985	788	4,591	3,326
Enterprise
Restructuring Cost and Reserve [Line Items]
Restructuring charges	(2,700)	(272)	(5,264)	(2,894)
Restructuring Charges and Other Expenses	2,700	272	5,264	2,894
Automotive
Restructuring Cost and Reserve [Line Items]
Restructuring charges	(3,212)	(849)	(7,538)	(1,000)
Restructuring Charges and Other Expenses	11,611	849	20,051	1,000
Other
Restructuring Cost and Reserve [Line Items]
Restructuring charges	116	(1,653)	(914)	(1,913)
Restructuring Charges and Other Expenses	445	1,653	3,981	1,913
Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring charges	(1,409)	(1,505)	(2,272)	(1,250)
Restructuring Charges and Other Expenses	3,728	5,319	10,663	13,317
Personnel
Restructuring Cost and Reserve [Line Items]
Restructuring charges	(9,945)	(3,704)	(18,428)	(7,364)
Personnel | Healthcare
Restructuring Cost and Reserve [Line Items]
Restructuring charges	(2,971)	(788)	(4,450)	(3,301)
Personnel | Enterprise
Restructuring Cost and Reserve [Line Items]
Restructuring charges	(2,700)	(265)	(5,251)	(527)
Personnel | Automotive
Restructuring Cost and Reserve [Line Items]
Restructuring charges	(3,593)	(849)	(5,863)	(1,000)
Personnel | Other
Restructuring Cost and Reserve [Line Items]
Restructuring charges	116	(1,095)	(914)	(1,344)
Personnel | Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring charges	(797)	(707)	(1,950)	(1,192)
Facilities
Restructuring Cost and Reserve [Line Items]
Restructuring charges	(245)	(1,363)	(2,151)	(3,019)
Facilities | Healthcare
Restructuring Cost and Reserve [Line Items]
Restructuring charges	(14)	0	(141)	(25)
Facilities | Enterprise
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0	(7)	(13)	(2,367)
Facilities | Automotive
Restructuring Cost and Reserve [Line Items]
Restructuring charges	381	0	(1,675)	0
Facilities | Other
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0	(558)	0	(569)
Facilities | Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring charges	(612)	(798)	(322)	(58)
Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Other Charges	11,279	3,814	23,971	12,067
Other Restructuring [Member] | Healthcare
Restructuring Cost and Reserve [Line Items]
Other Charges	0	0	0	0
Other Restructuring [Member] | Enterprise
Restructuring Cost and Reserve [Line Items]
Other Charges	0	0	0	0
Other Restructuring [Member] | Automotive
Restructuring Cost and Reserve [Line Items]
Other Charges	8,399	0	12,513	0
Other Restructuring [Member] | Other
Restructuring Cost and Reserve [Line Items]
Other Charges	561	0	3,067	0
Other Restructuring [Member] | Corporate
Restructuring Cost and Reserve [Line Items]
Other Charges	$ 2,319	3,814	$ 8,391	12,067
Chief Executive Officer [Member] | Other Restructuring [Member] | Corporate
Restructuring Cost and Reserve [Line Items]
Other Charges		$ 2,300		$ 5,700

Restructuring and Other Charg_5

Restructuring and Other Charges, net (Additional Information) (Detail) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019USD ($)	Mar. 31, 2018USD ($)	Mar. 31, 2019USD ($)	Mar. 31, 2018USD ($)	Sep. 30, 2018USD ($)
Restructuring Cost and Reserve [Line Items]
Document Period End Date			Mar. 31, 2019
Restructuring Charges and Other Expenses	$ 21,469	$ 8,881	$ 44,550	$ 22,450
Restructuring Reserve	14,591		$ 14,591		$ 16,193
Document Fiscal Year Focus			2019
Restructuring charges	10,190	5,067	$ 20,579	$ 10,383
Number of personnel eliminated			360	160
Professional service fees			$ 456	$ 1,451
Tangible Asset Impairment Charges	(800)	1,500	(300)	7,200
Personnel
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	10,076		10,076		9,690
Restructuring charges	9,945	3,704	18,428	7,364
Facilities
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	4,515		4,515		$ 6,503
Restructuring charges	245	1,363	2,151	3,019
Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Other Charges	11,279	3,814	23,971	12,067
Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring Charges and Other Expenses	3,728	5,319	10,663	13,317
Restructuring charges	1,409	1,505	2,272	1,250
Corporate | Personnel
Restructuring Cost and Reserve [Line Items]
Restructuring charges	797	707	1,950	1,192
Corporate | Facilities
Restructuring Cost and Reserve [Line Items]
Restructuring charges	612	798	322	58
Corporate | Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Other Charges	2,319	3,814	8,391	12,067
Corporate | Chief Executive Officer [Member] | Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Other Charges		$ 2,300		$ 5,700
Corporate transformation [Member] | Corporate | Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Other Charges	1,500		8,700
Stand-up and separation [Member] | Corporate | Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Other Charges	8,300		12,500
Accelerated depreciation [Member] | Corporate | Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Other Charges	$ 600		$ 3,100

Debt and Credit Facilities (Bor

Debt and Credit Facilities (Borrowing Obligations) (Detail) - USD ($) $ in Thousands	1 Months Ended			3 Months Ended	6 Months Ended
	Sep. 30, 2018	Nov. 30, 2017	Jan. 31, 2017	Mar. 31, 2018	Mar. 31, 2019	Dec. 22, 2016	Jun. 21, 2016	Oct. 22, 2012	Aug. 14, 2012
Debt Instrument [Line Items]
Document Period End Date					Mar. 31, 2019
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months					$ 0
Long-term Debt, Maturities, Repayments of Principal in Year Two					0
Long-term Debt, Maturities, Repayments of Principal in Year Three					0
Long-term Debt, Maturities, Repayments of Principal in Year Four					310,463
Long-term Debt, Maturities, Repayments of Principal in Year Five					676,488
Long-term Debt, Maturities, Repayments of Principal in Rolling after Year Five					1,150,000
Total debt	$ 2,185,361				1,911,185
Less: current portion	0				0
Total long-term debt	2,185,361				1,911,185
Debt Issuance Costs, Noncurrent, Net	(843)				(677)
Long-term Debt, Gross					2,136,951
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net					(225,766)
5.625% Senior Notes due 2026 [Member]
Debt Instrument [Line Items]
Senior Notes, net of unamortized premium	494,915				495,210	$ 500,000
5.375% Senior Notes due August 15, 2020
Debt Instrument [Line Items]
Senior Notes, net of unamortized premium	298,759				0			$ 350,000	$ 700,000
Repayments of Debt	150,000		$ 600,000
6.0% Senior Notes due 2024 [Member]
Debt Instrument [Line Items]
Senior Notes, net of unamortized premium	298,220				298,375		$ 300,000
Convertible Debentures One Percent Due Twenty Thirty Five [Member]
Debt Instrument [Line Items]
Senior Notes, net of unamortized premium	553,973				567,128
Convertible Debentures Two Point Seven Five Percent Due November One Twenty Thirty One [Member]
Debt Instrument [Line Items]
Convertible Debentures, net of unamortized discount	46,568				46,568
Repayments of Debt		$ 331,200		$ 331,200
1.25% Convertible Debentures due 2025 [Member]
Debt Instrument [Line Items]
Convertible Debentures, net of unamortized discount	263,863				269,485
Convertible Debentures One Point Five Percent Due November One Twenty Thirty Five [Member] [Member]
Debt Instrument [Line Items]
Convertible Debentures, net of unamortized discount	$ 229,906				235,096
Senior Notes [Member]
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months					0
Long-term Debt, Maturities, Repayments of Principal in Year Two					0
Long-term Debt, Maturities, Repayments of Principal in Year Three					0
Long-term Debt, Maturities, Repayments of Principal in Year Four					0
Long-term Debt, Maturities, Repayments of Principal in Year Five					0
Long-term Debt, Maturities, Repayments of Principal in Rolling after Year Five					800,000
Total debt					792,908
Long-term Debt, Gross					800,000
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net					(7,092)
Convertible Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months					0
Long-term Debt, Maturities, Repayments of Principal in Year Two					0
Long-term Debt, Maturities, Repayments of Principal in Year Three					0
Long-term Debt, Maturities, Repayments of Principal in Year Four					310,463
Long-term Debt, Maturities, Repayments of Principal in Year Five					676,488
Long-term Debt, Maturities, Repayments of Principal in Rolling after Year Five					350,000
Total debt					1,118,277
Long-term Debt, Gross					1,336,951
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net					$ (218,674)

Debt and Credit Facilities Borr

Debt and Credit Facilities Borrowing Obligations Detail (Details) - USD ($) $ in Millions	Mar. 31, 2019	Sep. 30, 2018
Borrowing Obligations Detail [Abstract]
Long-term Debt, Fair Value	$ 2,114.3	$ 2,423.6
Debt Instrument, Face Amount	$ 2,137	$ 2,437

Debt and Credit Facilities 5.37

Debt and Credit Facilities 5.375% Senior Notes due 2020 (Details) - USD ($) $ in Thousands	1 Months Ended		3 Months Ended	6 Months Ended
	Sep. 30, 2018	Jan. 31, 2017	Sep. 30, 2018	Mar. 31, 2019	Mar. 31, 2018	Jan. 09, 2017	Oct. 22, 2012	Aug. 14, 2012
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 2,437,000		$ 2,437,000	$ 2,137,000
Document Period End Date				Mar. 31, 2019
Repayments of Long-term Debt, Long-term Capital Lease Obligations, and Capital Securities				$ 300,000	$ 331,172
Loss on extinguishment of debt				910	$ 0
5.375% Senior Notes due August 15, 2020
Debt Instrument [Line Items]
Debt Instrument, Face Amount	300,000		300,000			$ 450,000
Senior Notes, Noncurrent	$ 298,759		$ 298,759	$ 0			$ 350,000	$ 700,000
Debt Instrument, Interest Rate, Stated Percentage	5.375%		5.375%	5.375%				5.375%
Unamortized Debt Issuance Expense	$ 1,241		$ 1,241	$ 0
Repayments of Debt	$ 150,000	$ 600,000
Loss on extinguishment of debt		$ (18,600)	$ (300)

Debt and Credit Facilities 6.0%

Debt and Credit Facilities 6.0% Senior Notes due 2024 (Details) - USD ($) $ in Thousands	1 Months Ended	6 Months Ended
	Jun. 30, 2016	Mar. 31, 2019	Sep. 30, 2018	Dec. 22, 2016	Jun. 21, 2016
5.625% Senior Notes due 2026 [Member]
Debt Instrument [Line Items]
Senior Notes, Noncurrent		$ 495,210	$ 494,915	$ 500,000
Debt Instrument, Interest Rate, Stated Percentage		5.625%		5.625%
Unamortized Debt Issuance Expense		$ 4,790	5,085
6.0% Senior Notes due 2024 [Member]
Debt Instrument [Line Items]
Senior Notes, Noncurrent		$ 298,375	$ 298,220		$ 300,000
Debt Instrument, Interest Rate, Stated Percentage		6.00%	6.00%		6.00%
Proceeds from Issuance of Long-term Debt	$ 297,500
Unamortized Debt Issuance Expense		$ 1,625	$ 1,780
Debt Instrument, Redemption Price, Percentage		100.00%

Debt and Credit Facilities 1.0%

Debt and Credit Facilities 1.0% Convertible Debentures due 2035 (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended			6 Months Ended
	Nov. 30, 2017	Mar. 31, 2018	Jun. 30, 2015	Dec. 31, 2014	Mar. 31, 2019	Mar. 31, 2018	Sep. 30, 2018	Dec. 07, 2015	Jun. 01, 2015	Oct. 24, 2011
Debt Instrument [Line Items]
Debt Instrument, Face Amount					$ 2,137,000		$ 2,437,000
Debt Issuance Costs, Noncurrent, Net					677		$ 843
Loss on extinguishment of debt					$ 910	$ 0
Convertible Debentures One Percent Due Twenty Thirty Five [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount								$ 676,500
Debt Instrument, Convertible, Carrying Amount of Equity Component								$ 181,100
Debt Instrument, Convertible, Conversion Price								$ 27.22
Debt Instrument, Interest Rate, Stated Percentage					1.00%		1.00%	1.00%
Convertible Debt, Noncurrent								$ 495,400
Convertible Debentures Two Point Seven Five Percent Due November One Twenty Thirty One [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount					$ 46,600					$ 690,000
Debt Instrument, Convertible, Carrying Amount of Equity Component										$ 156,400
Debt Instrument, Convertible, Conversion Price										$ 32.30
Repayments of Convertible Debt		$ 17,800	$ 256,200	$ 38,300		$ 17,800
Debt Instrument, Interest Rate, Stated Percentage					2.75%		2.75%			2.75%
Repayments of Debt	$ 331,200	$ 331,200
Convertible Debt, Noncurrent										$ 533,600
Convertible Debentures One Point Five Percent Due November One Twenty Thirty Five [Member] [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount									$ 263,900
Debt Instrument, Convertible, Carrying Amount of Equity Component									$ 55,300
Debt Instrument, Convertible, Conversion Price									$ 23.26
Debt Instrument, Interest Rate, Stated Percentage					1.50%		1.50%
Convertible Debt, Noncurrent									$ 208,600

Debt and Credit Facilities 2.75

Debt and Credit Facilities 2.75% Convertible Debentures due 2031 (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended			6 Months Ended
	Nov. 30, 2017	Mar. 31, 2018	Jun. 30, 2015	Dec. 31, 2014	Mar. 31, 2019	Mar. 31, 2018	Sep. 30, 2018	Oct. 24, 2011
Debt Instrument [Line Items]
Loss on extinguishment of debt					$ 910	$ 0
Debt Instrument, Face Amount					2,137,000		$ 2,437,000
Debt Issuance Costs, Noncurrent, Net					677		843
Convertible Debentures Two Point Seven Five Percent Due November One Twenty Thirty One [Member]
Debt Instrument [Line Items]
Repayments of Convertible Debt		$ 17,800	$ 256,200	$ 38,300		$ 17,800
Debt Instrument, Face Amount					46,600			$ 690,000
Repayments of Debt	$ 331,200	$ 331,200
Debt Instrument, Convertible, Conversion Price								$ 32.30
Debt Instrument, Unamortized Discount					$ 0		$ 0
Convertible Debt, Noncurrent								$ 533,600
Debt Instrument, Convertible, Carrying Amount of Equity Component								$ 156,400
Debt Instrument, Interest Rate, Stated Percentage					2.75%		2.75%	2.75%

Debt and Credit Facilities 1.5%

Debt and Credit Facilities 1.5% Convertible Debentures due 2035 (Details) - USD ($) $ / shares in Units, $ in Thousands	Mar. 31, 2019	Sep. 30, 2018	Jun. 01, 2015
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 2,137,000	$ 2,437,000
Debt Issuance Costs, Noncurrent, Net	$ 677	$ 843
Convertible Debentures One Point Five Percent Due November One Twenty Thirty Five [Member] [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount			$ 263,900
Debt Instrument, Interest Rate, Stated Percentage	1.50%	1.50%
Debt Instrument, Convertible, Conversion Price			$ 23.26
Debt issuance Percentage of Principal Amount			97.09%
Debt Instrument, Unamortized Discount (Premium), Net			$ 7,700
Debt Instrument, Unamortized Discount	$ 27,841	$ 32,845
Convertible Debt, Noncurrent			208,600
Debt Instrument, Convertible, Carrying Amount of Equity Component			$ 55,300

Debt and Credit Facilities Cred

Debt and Credit Facilities Credit Facility (Details) - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Sep. 30, 2018	Apr. 15, 2016
Line of Credit Facility [Line Items]
Debt Issuance Costs, Noncurrent, Net	$ 677		$ 843
Loss on extinguishment of debt	(910)	$ 0
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	235,600			$ 242,500
Letters of Credit Outstanding, Amount	$ 6,900

Debt and Credit Facilities Appl

Debt and Credit Facilities Applicable Borrowing Rates and Additional Detail (Details) - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2019	Sep. 30, 2018	Mar. 13, 2017	Dec. 22, 2016	Jun. 21, 2016	Dec. 07, 2015	Aug. 14, 2012	Oct. 24, 2011
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Unamortized Discount	$ 0	$ 0
5.625% Senior Notes due 2026 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.625%			5.625%
Debt Instrument, Interest Rate, Effective Percentage	5.625%
nuan_DebtInstrumentMaturityYear	2026
Unamortized Debt Issuance Expense	$ 4,790	5,085
Debt Instrument, Unamortized Premium	$ 0	$ 0
6.0% Senior Notes due 2024 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.00%	6.00%			6.00%
Debt Instrument, Interest Rate, Effective Percentage	6.00%	6.00%
nuan_DebtInstrumentMaturityYear	2024
Unamortized Debt Issuance Expense	$ 1,625	$ 1,780
Debt Instrument, Unamortized Premium	$ 0	$ 0
5.375% Senior Notes due August 15, 2020
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.375%	5.375%					5.375%
Debt Instrument, Interest Rate, Effective Percentage	5.28%	5.28%
nuan_DebtInstrumentMaturityYear	2020
Unamortized Debt Issuance Expense	$ 0	$ 1,241
Debt Instrument, Unamortized Premium	$ 0	$ 0
Convertible Debentures Two Point Seven Five Percent Due November One Twenty Thirty One [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.75%	2.75%						2.75%
Debt Instrument, Interest Rate, Effective Percentage	7.432%	7.43%
nuan_DebtInstrumentMaturityYear	2031
Unamortized Debt Issuance Expense	$ 0	$ 0
Debt Instrument, Unamortized Discount	$ 0	$ 0
Convertible Debentures One Point Five Percent Due November One Twenty Thirty Five [Member] [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	1.50%	1.50%
Debt Instrument, Interest Rate, Effective Percentage	5.394%	5.39%
nuan_DebtInstrumentMaturityYear	2035
Unamortized Debt Issuance Expense	$ 958	$ 1,144
Debt Instrument, Unamortized Discount	$ 27,841	$ 32,845
Convertible Debentures One Percent Due Twenty Thirty Five [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	1.00%	1.00%				1.00%
Debt Instrument, Interest Rate, Effective Percentage	5.622%	5.62%
nuan_DebtInstrumentMaturityYear	2035
Unamortized Debt Issuance Expense	$ 4,923	$ 5,587
Debt Instrument, Unamortized Discount	$ 104,437	116,928
Convertible Debentures 1.25% Due 2025 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	1.25%		1.25%
Debt Instrument, Interest Rate, Effective Percentage	5.578%
nuan_DebtInstrumentMaturityYear	2025
Unamortized Debt Issuance Expense	$ 3,419	3,704
Debt Instrument, Unamortized Discount	$ 77,096	$ 82,433
Minimum [Member] | Revolving Credit Facility Due April Fifteenth Twenty Twenty One [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.50%
Minimum [Member] | Revolving Credit Facility Due April Fifteenth Twenty Twenty One [Member] | London Interbank Offered Rate [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.50%
Maximum | Revolving Credit Facility Due April Fifteenth Twenty Twenty One [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.75%
Maximum | Revolving Credit Facility Due April Fifteenth Twenty Twenty One [Member] | London Interbank Offered Rate [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.75%

Debt and Credit Facilities 5.62

Debt and Credit Facilities 5.625% Senior Notes due December 2026 (Details) - USD ($) $ in Thousands	1 Months Ended	6 Months Ended
	Dec. 31, 2016	Mar. 31, 2019	Sep. 30, 2018	Dec. 22, 2016
Debt Instrument [Line Items]
Document Period End Date		Mar. 31, 2019
5.625% Senior Notes due 2026 [Member]
Debt Instrument [Line Items]
Senior Notes, Noncurrent		$ 495,210	$ 494,915	$ 500,000
Debt Instrument, Interest Rate, Stated Percentage		5.625%		5.625%
Proceeds from Issuance of Senior Long-term Debt	$ 495,000
Before December 15, 2021 [Member] | 5.625% Senior Notes due 2026 [Member]
Debt Instrument [Line Items]
Aggregate Principal Amount of Senior Notes, Redemption Price, Percentage		100.00%

Debt and Credit Facilities 1.25

Debt and Credit Facilities 1.25% Convertible Debentures due 2025 (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	1 Months Ended	3 Months Ended			6 Months Ended		59 Months Ended
	Nov. 30, 2017	Mar. 31, 2018	Jun. 30, 2015	Dec. 31, 2014	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2018	Sep. 30, 2018	Mar. 13, 2017	Oct. 24, 2011
Debt Instrument [Line Items]
Document Period End Date					Mar. 31, 2019
Debt Instrument, Face Amount					$ 2,137			$ 2,437
Stock Repurchased and Retired During Period, Shares					6.1	5.8	62.2
Stock Repurchased During Period, Value					$ 91.3	$ 99.1	$ 1,034
Convertible Debentures 1.25% Due 2025 [Member]
Debt Instrument [Line Items]
Convertible Debt, Noncurrent									$ 252.1
Debt Instrument, Face Amount									$ 350
Debt Instrument, Interest Rate, Stated Percentage					1.25%				1.25%
Proceeds from Issuance of Long-term Debt						343.6
Debt Instrument, Convertible, Carrying Amount of Equity Component									$ 97.9
Debt Instrument, Convertible, Conversion Price									$ 22.22
Convertible Debentures Two Point Seven Five Percent Due November One Twenty Thirty One [Member]
Debt Instrument [Line Items]
Convertible Debt, Noncurrent										$ 533.6
Debt Instrument, Face Amount					$ 46.6					$ 690
Debt Instrument, Interest Rate, Stated Percentage					2.75%			2.75%		2.75%
Repayments of Convertible Debt		$ 17.8	$ 256.2	$ 38.3		$ 17.8
Repayments of Debt	$ 331.2	$ 331.2
Debt Instrument, Convertible, Carrying Amount of Equity Component										$ 156.4
Debt Instrument, Convertible, Conversion Price										$ 32.30

Stockholders' Equity Stockhol_2

Stockholders' Equity Stockholders' Equity (Details) - USD ($) shares in Millions, $ in Millions	6 Months Ended		59 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2018	Aug. 01, 2018	Apr. 29, 2015	Apr. 29, 2013
Stockholders Equity Note [Line Items]
Document Period End Date	Mar. 31, 2019
Stock Repurchase Program, Number of Shares Authorized to be Repurchased, Value				$ 500	$ 500	$ 500
Stock Repurchased and Retired During Period, Shares	6.1	5.8	62.2
Stock Repurchased During Period, Value	$ 91.3	$ 99.1	$ 1,034
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 466

Net Income (Loss) Per Share (Ad

Net Income (Loss) Per Share (Additional Information) (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income (loss)	$ 77,332	$ (164,053)	$ 96,422	$ (110,825)
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent	(20,749)	(167,141)	(3,050)	(119,676)
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	$ 98,081	$ 3,088	$ 99,472	$ 8,851
Weighted Average Number of Shares Outstanding, Basic	285,866	294,103	286,849	292,720
Dilutive Securities, Effect on Basic Earnings Per Share	0	0	0	0
Weighted Average Number of Shares Outstanding, Diluted	285,866	294,103	286,849	292,720
Earnings Per Share, Basic	$ 0.27	$ (0.56)	$ 0.34	$ (0.38)
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Basic Share	0.34	0.01	0.35	0.03
Income (Loss) from Continuing Operations, Per Basic Share	$ (0.07)	$ (0.57)	$ (0.01)	$ (0.41)
Weighted Average Number of Shares, Contingently Issuable	2,646	2,836	2,422	2,387
Income (Loss) from Continuing Operations, Per Diluted Share	$ (0.07)	$ (0.57)	$ (0.01)	$ (0.41)
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Diluted Share	0.34	0.01	0.35	0.03
Earnings Per Share, Diluted	$ 0.27	$ (0.56)	$ 0.34	$ (0.38)
Anti-dilutive common equivalent shares excluded from computation of diluted net income (loss) per share	460	2,679	635	4,178

Stock-Based Compensation (Inclu

Stock-Based Compensation (Included in Consolidated Statements of Operations) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Document Period End Date			Mar. 31, 2019
Stock based compensation	$ 29,871	$ 31,742	$ 64,211	$ 67,967
Cost of hosting and professional services
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock based compensation	5,481	6,306	12,813	13,684
Cost of product and licensing
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock based compensation	132	112	396	378
Cost of maintenance and support
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock based compensation	381	538	147	1,219
Research and development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock based compensation	7,820	7,757	16,650	16,764
Sales and marketing
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock based compensation	7,638	7,372	16,895	17,536
General and administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock based compensation	$ 8,419	$ 9,657	$ 17,310	$ 18,386

Stock-Based Compensation (Summa

Stock-Based Compensation (Summary of Activity Relating to Restricted Units) (Detail) - USD ($) $ / shares in Units, $ in Millions	6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Sep. 30, 2018	Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Document Period End Date	Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	13,116		19,144
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	2 years 11 months
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price	$ 17.63			$ 16.41
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value	$ 0.1
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	13,116		21,939
Restricted Units, Outstanding [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term	2 years 11 months	2 years 7 months
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value	$ 0.1			$ 0.1
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price	$ 17.63		$ 17.31
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	1,500
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price	$ 12.79
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period	4,528
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price	$ 17.89
Closing market value of common stock	16.93
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Purchase price for restricted units, vested	$ 0.001
Number of Shares Underlying Restricted Units — Contingent Awards
Restricted Units, Outstanding [Roll Forward]
Outstanding at September 30, 2018	3,039,568
Granted	1,332,963
Earned/released	(1,366,735)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Number of Shares, Period Increase (Decrease)	296,759
Forfeited	(613,805)
Outstanding March 31, 2019	2,095,232
Weighted average remaining recognition period of outstanding restricted units	1 year 10 months 20 days
Unrecognized stock-based compensation expense of outstanding restricted units	$ 30.4
Aggregate intrinsic value of outstanding restricted units (b)	$ 40.2
Number of Shares Underlying Restricted Units — Time-Based Awards
Restricted Units, Outstanding [Roll Forward]
Outstanding at September 30, 2018	6,872,087
Granted	5,913,256
Earned/released	(4,594,896)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Number of Shares, Period Increase (Decrease)	296,759
Forfeited	(937,614)
Outstanding March 31, 2019	7,549,592
Weighted average remaining recognition period of outstanding restricted units	1 year 8 months 20 days
Unrecognized stock-based compensation expense of outstanding restricted units	$ 71.2
Aggregate intrinsic value of outstanding restricted units (b)	$ 123.3

Stock-Based Compensation (Sum_2

Stock-Based Compensation (Summary of Weighted-Average Grant-Date Fair Value and Intrinsic Value of Restricted Units Vested) (Detail) - USD ($) $ / shares in Units, $ in Millions	6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Document Period End Date	Mar. 31, 2019
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant-date fair value per share	$ 16.35	$ 15.67
Total intrinsic value of shares vested (in millions)	$ 95.2	$ 94

Stock-Based Compensation Stock

Stock-Based Compensation Stock Incentive Plan (Details)	6 Months Ended
	Mar. 31, 2019shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized	82,250,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	83,500,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	8,400,000

Income Taxes Components of Inco

Income Taxes Components of Income (Loss) Before Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Components of Income (Loss) before Income Taxes [Abstract]
Document Period End Date			Mar. 31, 2019
Domestic	$ (35,351)	$ (80,758)	$ (15,563)	$ (119,867)
Foreign	13,644	(84,390)	12,541	(76,785)
Loss before income taxes	$ (21,707)	$ (165,148)	$ (3,022)	$ (196,652)

Income Taxes (Components of Ben

Income Taxes (Components of Benefit from Income Taxes) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Domestic	$ (5,272)	$ 6,989	$ (5,719)	$ (90,143)
Foreign	4,314	(4,996)	5,747	13,167
(Benefit) provision for income taxes	$ (958)	$ 1,993	$ 28	$ (76,976)
Effective tax rate	4.40%	(1.20%)	(0.90%)	39.10%

Income Taxes (Additional Inform

Income Taxes (Additional Information) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Business Acquisition [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	24.53%	21.00%	24.53%
Deferred Income Tax Expense (Benefit)			$ (12,815)	$ (90,143)
Effective Income Tax Rate Reconciliation, Percent	4.40%	(1.20%)	(0.90%)	39.10%
TCJA [Domain]
Business Acquisition [Line Items]
Deferred Income Tax Expense (Benefit)				$ 87,000
Current Income Tax Expense (Benefit)				$ 2,000

Commitments and Contingencies (

Commitments and Contingencies (Details)	6 Months Ended
	Mar. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Indemnification term for former officers and directors	6 years

Segment and Geographic Inform_3

Segment and Geographic Information and Significant Customers (Segment Results Along with Reconciliation of Segment Profit to Income Before Income Taxes) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Segment Reporting Information [Line Items]
Stranded Costs			$ 700	$ 1,800
Document Period End Date			Mar. 31, 2019
Segment Revenues	$ 409,583	$ 466,193	$ 903,237	913,417
Segment profit	118,904	146,255	292,659	286,103
Corporate expenses and other, net	(32,435)	(63,508)	(68,057)	(107,079)
Acquisition-related revenues	(1,582)	(3,188)	(3,138)	(9,159)
Stock-based compensation	(29,871)	(31,742)	(64,211)	(67,967)
Amortization of intangible assets	(26,004)	(31,455)	(52,735)	(63,810)
Business Combination, Acquisition Related Costs	(2,233)	(2,360)	(5,069)	(7,921)
Restructuring and other charges, net	(21,469)	(8,881)	(44,550)	(22,450)
Goodwill and Intangible Asset Impairment	0	(137,907)	0	(137,907)
Other expenses, net	(27,017)	(32,362)	(57,921)	(66,462)
Loss before income taxes	(21,707)	(165,148)	(3,022)	(196,652)
Segment Reconciling Items [Member]
Segment Reporting Information [Line Items]
Segment Revenues	(1,582)	(3,188)	(3,138)	(9,159)
Health Care Segment [Member]
Segment Reporting Information [Line Items]
Segment Revenues	204,404		476,269
segment revenue	204,549	261,240	476,527	506,775
Segment profit	63,136	86,235	167,058	162,462
Enterprise Segment [Member]
Segment Reporting Information [Line Items]
Segment Revenues	115,442		244,894
segment revenue	115,637	112,667	245,329	233,266
Segment profit	23,549	25,288	68,195	62,565
Automotive Segment [Member]
Segment Reporting Information [Line Items]
Segment Revenues	72,999		146,978
segment revenue	74,242	68,950	149,424	130,448
Segment profit	26,580	28,719	45,965	51,745
Other Segments [Member]
Segment Reporting Information [Line Items]
Segment Revenues	16,738		35,096
segment revenue	16,737	26,524	35,095	52,087
Segment profit	5,639	6,013	11,441	9,331
Operating Segments [Member]
Segment Reporting Information [Line Items]
segment revenue	$ 411,165	$ 469,381	$ 906,375	$ 922,576

Segment and Geographic Inform_4

Segment and Geographic Information and Significant Customers (Classification of Revenue by Major Geographic Areas) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Document Period End Date			Mar. 31, 2019
Segment Revenues	$ 409,583	$ 466,193	$ 903,237	$ 913,417
UNITED STATES
Revenues from External Customers and Long-Lived Assets [Line Items]
Segment Revenues	299,101	342,003	682,533	680,486
International [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Segment Revenues	$ 110,482	$ 124,190	$ 220,704	$ 232,931

Supplemental Cash Flow Suppleme

Supplemental Cash Flow Supplemental Cash Flow (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Supplemental Cash Flow Elements [Abstract]
Interest Paid, Including Capitalized Interest, Operating and Investing Activities	$ 9,186	$ 21,427	$ 40,754	$ 48,708
Income Taxes Paid	$ 4,407	$ 4,233	$ 7,214	$ 8,833

Related party transaction (Deta

Related party transaction (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended	12 Months Ended
	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Mar. 31, 2019	Sep. 30, 2018
Document Period End Date				Mar. 31, 2019
Magnet [Member] [Member]
Payments to Acquire Intangible Assets	$ 0.3			$ 0.9
Finite-Lived Intangible Assets, Cost Incurred to Renew or Extend	$ 9			$ 9
Licensed Technology [Member] | Magnet [Domain]
Related Party Transaction, Purchases from Related Party		$ 1.5	$ 3.5		$ 5
Service Agreements [Member] | Maximum | Magnet [Domain]
Related Party Transaction, Purchases from Related Party					$ 2

Uncategorized Items - nuan-2019

Label	Element	Value
Contract with Customer, Asset, Net	us-gaap_ContractWithCustomerAssetNet	$ 168,595,000