PTC (PTC) 10-K 22 Nov 13 2013 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
	Sep. 30, 2012	Nov. 18, 2013	Mar. 30, 2013
Entity Information [Line Items]	'	'	'
Document Type	'10-K	'	'
Amendment Flag	'false	'	'
Document Period End Date	30-Sep-13	'	'
Entity Registrant Name	'PTC Inc.	'	'
Entity Central Index Key	'0000857005	'	'
Current Fiscal Year End Date	'--09-30	'	'
Document Fiscal Year Focus	'2013	'	'
Document Fiscal Period Focus	'FY	'	'
Entity Current Reporting Status	'Yes	'	'
Entity Voluntary Filers	'No	'	'
Entity Well-known Seasoned Issuer	'Yes	'	'
Entity Filer Category	'Large Accelerated Filer	'	'
Entity Public Float	'	'	$3,018,836,651
Entity Common Stock, Shares Outstanding	'	119,494,574	'

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Sep. 30, 2013	Sep. 30, 2012
In Thousands, unless otherwise specified
ASSETS	'	'
Cash and cash equivalents	$241,913	$489,543
Accounts receivable, net of allowance for doubtful accounts of $3,418 and $3,902 at September 30, 2012 and 2011, respectively	229,106	217,370
Prepaid expenses	45,674	28,341
Other current assets	123,878	121,019
Deferred tax assets	39,645	22,879
Total current assets	680,216	879,152
Property and equipment, net	64,652	63,466
Goodwill	769,095	610,347
Acquired intangible assets, net	273,121	185,885
Deferred tax assets	7,696	20,660
Other assets	34,126	32,124
Total assets	1,828,906	1,791,634
LIABILITIES AND STOCKHOLDERS' EQUITY	'	'
Accounts payable, accrued expenses and other current liabilities	66,006	65,517
Accrued compensation and benefits	112,733	92,212
Accrued income taxes	7,074	804
Deferred tax liabilities	853	402
Current portion of long term debt	15,000	7,500
Deferred revenue	326,947	315,309
Total current liabilities	528,613	481,744
Long term debt, net of current portion	243,125	362,500
Deferred tax liabilities	42,088	31,854
Deferred revenue	9,966	12,220
Other liabilities	78,634	106,057
Total liabilities	902,426	994,375
Commitments and contingencies (Note I)	'	'
Stockholders' equity:	'	'
Preferred stock, $0.01 par value; 5,000 shares authorized; none issued	0	0
Common stock, $0.01 par value; 500,000 shares authorized; 118,446 and 119,553 shares issued and outstanding at September 30, 2013 and 2012, respectively	1,185	1,196
Additional paid-in capital	1,786,820	1,822,698
Accumulated deficit	-810,365	-954,134
Accumulated other comprehensive loss	-51,160	-72,501
Total stockholders' equity	926,480	797,259
Total liabilities and stockholders' equity	$1,828,906	$1,791,634

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parentheticals) (USD $)	Sep. 30, 2013	Sep. 30, 2012
In Thousands, except Per Share data, unless otherwise specified
Current assets:	'	'
Allowance for doubtful accounts	$3,030	$3,418
Stockholders' equity:	'	'
Preferred stock, par value	$0.01	$0.01
Preferred stock, shares authorized	5,000	5,000
Preferred stock, shares issued	0	0
Common stock, par value	$0.01	$0.01
Common stock, shares authorized	500,000	500,000
Common stock, shares issued	118,446	119,553
Common stock, shares outstanding	118,446	119,553

Consolidated_Statements_Of_Ope

Consolidated Statements Of Operations (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Revenue:	'	'	'
License	$344,209	$348,394	$342,121
Service	294,653	295,342	267,150
Support	654,679	611,943	557,678
Total revenue	1,293,541	1,255,679	1,166,949
Cost of revenue:	'	'	'
Cost of license revenue	33,004	30,595	28,792
Cost of service revenue	258,954	265,483	260,650
Cost of support revenue	81,081	76,050	67,326
Total cost of revenue	373,039	372,128	356,768
Gross margin	920,502	883,551	810,181
Sales and marketing	360,640	377,796	353,051
Research and development	221,918	214,960	211,406
General and administrative	131,937	117,468	110,291
Amortization of acquired intangible assets	26,486	20,303	18,319
Restructuring charges	52,197	24,928	0
Total operating expenses	793,178	755,455	693,067
Operating income	127,324	128,096	117,114
Foreign currency losses, net	-2,027	-5,862	-12,293
Interest income	2,862	2,920	3,844
Interest expense	6,976	4,746	3,310
Other income (expense), net	5,051	328	-807
Income before income taxes	126,234	120,736	104,548
(Benefit) provision for income taxes	-17,535	156,134	19,124
Net income (loss)	$143,769	($35,398)	$85,424
Earnings (loss) per sharebBasic (in USD per share)	$1.20	($0.30)	$0.73
Earnings (loss) per sharebDiluted (in USD per share)	$1.19	($0.30)	$0.71
Weighted average shares outstandingbBasic (in shares)	119,473	118,705	117,579
Weighted average shares outstandingbDiluted (in shares)	121,240	118,705	120,974

Consolidated_Statements_Of_Com

Consolidated Statements Of Comprehensive Income (Loss) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Statement of Comprehensive Income [Abstract]	'	'	'
Net income (loss)	$143,769	($35,398)	$85,424
Other comprehensive income (loss), net of tax:	'	'	'
Foreign currency translation adjustment, net of tax of $0 for all periods	7,165	-2,176	-7,174
Minimum pension liability adjustment, net of tax of $8,094 for 2013, $4,875 for 2012, and $3,209 for 2011	14,176	-5,561	-5,110
Other comprehensive income (loss)	21,341	-7,737	-12,284
Comprehensive income (loss)	$165,110	($43,135)	$73,140

Consolidated_Statements_Of_Com1

Consolidated Statements Of Comprehensive (Loss) Income (Parentheticals) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Foreign currency translation adjustment, tax	$0	$0	$0
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Tax	$8,094	$4,875	$3,209

Consolidated_Statements_Of_Cas

Consolidated Statements Of Cash Flows (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Cash flows from operating activities:	'	'	'
Net income (loss)	$143,769	($35,398)	$85,424
Adjustments to reconcile net income (loss) to net cash provided by operating activities:	'	'	'
Stock-based compensation	48,787	51,305	45,402
Depreciation and amortization	76,551	66,471	62,394
Provision for loss on accounts receivable	213	258	51
(Benefit from) provision for deferred income taxes	-39,714	104,766	-35,063
Excess tax benefits realized from stock-based awards	-334	-1,324	-5,398
Other non-cash costs, net	126	32	55
Changes in operating assets and liabilities, excluding the effects of acquisitions:	'	'	'
Accounts receivable	17,308	32,309	-32,334
Accounts payable and accrued expenses	-4,828	-8,556	-58
Accrued litigation	0	0	-52,129
Accrued compensation and benefits	11,036	983	-3,788
Deferred revenue	6,727	14,362	8,195
Accrued income taxes, net of income tax receivable	-15,211	-4,005	18,931
Other current assets and prepaid expenses	-9,113	8,332	-1,826
Other noncurrent assets	-11,766	-12,423	-15,111
Other noncurrent liabilities	1,132	863	3,953
Net cash provided by operating activities	224,683	217,975	78,698
Cash flows from investing activities:	'	'	'
Additions to property and equipment	-29,328	-31,413	-27,817
Acquisitions of businesses, net of cash acquired	-245,843	-220	-280,026
Other	721	0	0
Net cash used by investing activities	-274,450	-31,633	-307,843
Cash flows from financing activities:	'	'	'
Borrowings under revolving credit facility	0	230,000	250,000
Repayments of borrowings under revolving credit facility	-111,875	-60,000	-50,000
Repurchases of common stock	-74,871	-34,953	-54,921
Proceeds from issuance of common stock	4,884	21,210	24,756
Excess tax benefits realized from stock-based awards	334	1,324	5,398
Payments of withholding taxes in connection with vesting of stock-based awards	-14,996	-20,967	-22,520
Credit facility origination costs	0	-1,951	-995
Other	0	0	-1,298
Net cash (used) provided by financing activities	-196,524	134,663	150,420
Effect of exchange rate changes on cash and cash equivalents	-1,339	660	6,350
Net (decrease) increase in cash and cash equivalents	-247,630	321,665	-72,375
Cash and cash equivalents, beginning of year	489,543	167,878	240,253
Cash and cash equivalents, end of year	$241,913	$489,543	$167,878

Consolidated_Statements_Of_Sto

Consolidated Statements Of Stockholders' Equity (USD $)	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Loss [Member]
In Thousands, unless otherwise specified
Balance, value at Sep. 30, 2010	$747,304	$1,158	$1,802,786	($1,004,160)	($52,480)
Balance, shares at Sep. 30, 2010	'	115,826	'	'	'
Increase (Decrease) in Stockholders' Equity [Roll Forward]	'	'	'	'	'
Common stock issued for employee stock-based awards, shares	'	4,803	'	'	'
Common stock issued for employee stock-based awards, value	24,756	48	24,708	'	'
Shares surrendered by employees to pay taxes related to stock-based awards, shares	'	-1,043	'	'	'
Shares surrendered by employees to pay taxes related to stock-based awards, value	-22,520	-10	-22,510	'	'
Compensation expense from stock-based awards	45,402	'	45,402	'	'
Excess tax benefits (tax shortfalls) from stock-based awards	9,438	'	9,438	'	'
Net income (loss)	85,424	'	'	85,424	'
Repurchases of common stock, shares	-2,649	-2,649	'	'	'
Repurchases of common stock, value	-54,921	-27	-54,894	'	'
Foreign currency translation adjustment	-7,174	'	'	'	-7,174
Change in pension benefits, net of tax	-5,110	'	'	'	-5,110
Other	-91	'	'	'	'
Balance, value at Sep. 30, 2011	822,690	1,169	1,805,021	-918,736	-64,764
Balance, shares at Sep. 30, 2011	'	116,937	'	'	'
Increase (Decrease) in Stockholders' Equity [Roll Forward]	'	'	'	'	'
Common stock issued for employee stock-based awards, shares	'	5,077	'	'	'
Common stock issued for employee stock-based awards, value	21,210	51	21,159	'	'
Shares surrendered by employees to pay taxes related to stock-based awards, shares	'	-908	'	'	'
Shares surrendered by employees to pay taxes related to stock-based awards, value	-20,967	-9	-20,958	'	'
Compensation expense from stock-based awards	51,305	'	51,305	'	'
Excess tax benefits (tax shortfalls) from stock-based awards	1,109	'	1,109	'	'
Net income (loss)	-35,398	'	'	-35,398	'
Repurchases of common stock, shares	-1,553	-1,553	'	'	'
Repurchases of common stock, value	-34,953	-15	-34,938	'	'
Foreign currency translation adjustment	-2,176	'	'	'	-2,176
Change in pension benefits, net of tax	-5,561	'	'	'	-5,561
Balance, value at Sep. 30, 2012	797,259	1,196	1,822,698	-954,134	-72,501
Balance, shares at Sep. 30, 2012	119,553	119,553	'	'	'
Increase (Decrease) in Stockholders' Equity [Roll Forward]	'	'	'	'	'
Common stock issued for employee stock-based awards, shares	'	2,655	'	'	'
Common stock issued for employee stock-based awards, value	4,884	27	4,857	'	'
Shares surrendered by employees to pay taxes related to stock-based awards, shares	'	-709	'	'	'
Shares surrendered by employees to pay taxes related to stock-based awards, value	-14,996	-7	-14,989	'	'
Compensation expense from stock-based awards	48,787	'	48,787	'	'
Excess tax benefits (tax shortfalls) from stock-based awards	307	'	307	'	'
Net income (loss)	143,769	'	'	143,769	'
Repurchases of common stock, shares	-3,053	-3,053	'	'	'
Repurchases of common stock, value	-74,871	-31	-74,840	'	'
Foreign currency translation adjustment	7,165	'	'	'	7,165
Change in pension benefits, net of tax	14,176	'	'	'	14,176
Balance, value at Sep. 30, 2013	$926,480	$1,185	$1,786,820	($810,365)	($51,160)
Balance, shares at Sep. 30, 2013	118,446	118,446	'	'	'

Description_of_Business_and_Ba

Description of Business and Basis of Presentation	12 Months Ended
	Sep. 30, 2013
Description Of Business And Basis Of Presentation [Abstract]	'
Description of Business and Basis Of Presentation	'
	Description of Business and Basis of Presentation
	Business
	PTC Inc. was incorporated in 1985 and is headquartered in Needham, Massachusetts. PTC Inc. develops and delivers technology solutions, comprised of software and services, that transform the way our customers create and service their products. Our solutions help our customers in discrete manufacturing organizations optimize the activities within individual business functions, including engineering, supply chain, manufacturing and service, and coordinate these processes across the enterprise to create product and service advantage. Our technology solutions are complemented by our services and support organizations, as well as third-party resellers and other strategic partners, who provide services and support to customers worldwide.
	Basis of Presentation
	Our fiscal year-end is September 30. The consolidated financial statements include PTC Inc. (the parent company) and its wholly owned subsidiaries, including those operating outside the U.S. All intercompany balances and transactions have been eliminated in the consolidated financial statements.
	We prepare our financial statements under generally accepted accounting principles in the U.S. that require management to make estimates and assumptions that affect the amounts reported and the related disclosures. Actual results could differ from these estimates.

Summary_Of_Significant_Account

Summary Of Significant Accounting Policies	12 Months Ended
	Sep. 30, 2013
Accounting Policies [Abstract]	'
Summary Of Significant Accounting Policies	'
	Summary of Significant Accounting Policies
	Foreign Currency Translation
	For our non-U.S. operations where the functional currency is the local currency, we translate assets and liabilities at exchange rates in effect at the balance sheet date and record translation adjustments in stockholders’ equity. For our non-U.S. operations where the U.S. dollar is the functional currency, we remeasure monetary assets and liabilities using exchange rates in effect at the balance sheet date and nonmonetary assets and liabilities at historical rates and record resulting exchange gains or losses in foreign currency net losses in the consolidated statement of operations. We translate income statement amounts at average rates for the period. Transaction gains and losses are recorded in foreign currency net losses in the consolidated statements of operations.
	Revenue Recognition
	We derive revenues from three primary sources: (1) software licenses, (2) services, and (3) support. We exercise judgment and use estimates in connection with determining the amounts of software license and services revenues to be recognized in each accounting period. We recognize revenue when: (1) persuasive evidence of an arrangement exists, (2) delivery has occurred (generally, FOB shipping point or electronic distribution), (3) the fee is fixed or determinable, and (4) collection is probable.
	Our software is distributed primarily through our direct sales force. In addition, we have an indirect distribution channel through alliances with resellers. Revenue arrangements with resellers are recognized on a sell-through basis; that is, when we deliver the product to the end-user customer. We record consideration given to a reseller as a reduction of revenue to the extent we have recorded revenue from the reseller. We do not offer contractual rights of return, stock balancing, or price protection to our resellers, and actual product returns from them have been insignificant to date. As a result, we do not maintain reserves for reseller product returns.
	At the time of each sale transaction, we must make an assessment of the collectability of the amount due from the customer. Revenue is only recognized at that time if management deems that collection is probable. In making this assessment, we consider customer credit-worthiness and historical payment experience. At that same time, we assess whether fees are fixed or determinable and free of contingencies or significant uncertainties. In assessing whether the fee is fixed or determinable, we consider the payment terms of the transaction, including transactions with payment terms that extend beyond our customary payment terms, and our collection experience in similar transactions without making concessions, among other factors. We have periodically provided financing to credit-worthy customers with payment terms up to 24 months. If the fee is determined not to be fixed or determinable, revenue is recognized only as payments become due from the customer, provided that all other revenue recognition criteria are met. Our software license arrangements generally do not include customer acceptance provisions. However, if an arrangement includes an acceptance provision, we record revenue only upon the earlier of (1) receipt of written acceptance from the customer or (2) expiration of the acceptance period.
	Our software arrangements often include implementation and consulting services that are sold under consulting engagement contracts or as part of the software license arrangement. When we determine that such services are not essential to the functionality of the licensed software, we record revenue separately for the license and service elements of these arrangements, provided that appropriate evidence of fair value exists for the undelivered services (see discussion below). Generally, we consider that a service is not essential to the functionality of the software based on various factors, including if the services may be provided by independent third parties experienced in providing such consulting and implementation in coordination with dedicated customer personnel and whether the services result in significant modification or customization of the software functionality. When consulting services qualify for separate accounting, consulting revenues under time and materials billing arrangements are recognized as the services are performed. Consulting revenues under fixed-priced contracts are generally recognized as the services are performed using a proportionate performance model with hours or costs as the input method of attribution. When we provide consulting services considered essential to the functionality of the software, the arrangement does not qualify for separate accounting of the license and service elements, and the license revenue is recognized together with the consulting services using the percentage-of-completion method of contract accounting. Under such arrangements, consideration is recognized as the services are performed as measured by an observable input. In these circumstances, we separate license revenue from service revenue for income statement presentation by allocating vendor specific objective evidence (VSOE) of fair value of the consulting services as service revenue and the residual portion as license revenue. Under the percentage-of-completion method, we estimate the stage of completion of contracts with fixed or “not to exceed” fees based on hours or costs incurred to date as compared with estimated total project hours or costs at completion. Adjustments to estimates to complete are made in the periods in which facts resulting in a change become known. When total cost estimates exceed revenues, we accrue for the estimated losses when identified. The use of the proportionate performance and percentage-of-completion methods of accounting require significant judgment relative to estimating total contract costs or hours (hours being a proxy for costs), including assumptions relative to the length of time to complete the project, the nature and complexity of the work to be performed and anticipated changes in salaries and other costs.
	We generally use the residual method to recognize revenue from software arrangements that include one or more elements to be delivered at a future date when evidence of the fair value of all undelivered elements exists, and the elements of the arrangement qualify for separate accounting as described above. Under the residual method, the fair value of the undelivered elements (i.e., support and services) based on VSOE is deferred and the remaining portion of the total arrangement fee is allocated to the delivered elements (i.e., software license). If evidence of the fair value of one or more of the undelivered elements does not exist, all revenues are deferred and recognized when delivery of all of those elements has occurred or when fair values can be established. We determine VSOE of the fair value of services and support revenue based upon our recent pricing for those elements when sold separately. For certain transactions, VSOE of the fair value of support revenue is determined based on a substantive support renewal clause within a customer contract. Our current pricing practices are influenced primarily by product type, purchase volume, sales channel and customer location. We review services and support sold separately on a periodic basis and update, when appropriate, our VSOE of fair value for such services to ensure that it reflects our recent pricing experience.
	Generally, our contracts are accounted for individually. However, when contracts are closely interrelated and dependent on each other, it may be necessary to account for two or more contracts as one to reflect the substance of the group of contracts.
	For subscription-based licenses, license revenue is recognized ratably over the term of the arrangement. In limited circumstances, where the right to use the software license is contingent upon current payments of support, fees for software license and support are recognized ratably over the initial support term.
	Support contracts generally include rights to unspecified upgrades (when and if available), telephone and internet-based support, updates and bug fixes. support revenue is recognized ratably over the term of the support contract on a straight-line basis.
	Reimbursements of out-of-pocket expenditures incurred in connection with providing consulting services are included in services revenue, with the offsetting expense recorded in cost of service revenue.
	Training services include on-site and classroom training. Training revenues are recognized as the related training services are provided.
	Deferred Revenue
	Deferred revenue primarily relates to software support agreements billed to customers for which the services have not yet been provided. The liability associated with performing these services is included in deferred revenue and, if not yet paid, the related amount is included in other current assets. Billed but uncollected support-related amounts included in other current assets at September 30, 2013 and 2012 were $108.6 million and $110.7 million, respectively. Deferred revenue consisted of the following:
		September 30,
		2013		2012
		(in thousands)
	Deferred support revenue	$	312,721	$	306,940
	Deferred service revenue	18,793		14,127
	Deferred license revenue	5,399		6,462
	Total deferred revenue	$	336,913	$	327,529
	Cash, Cash Equivalents
	Our cash equivalents are invested in money market accounts and time deposits of financial institutions. We have established guidelines relative to credit ratings, diversification and maturities that are intended to maintain safety and liquidity. Cash equivalents include highly liquid investments with maturity periods of three months or less when purchased.
	Concentration of Credit Risk and Fair Value of Financial Instruments
	The amounts reflected in the consolidated balance sheets for cash and cash equivalents, accounts receivable and accounts payable approximate their fair value due to their short maturities. Financial instruments that potentially subject us to concentration of credit risk consist primarily of investments, trade accounts receivable and foreign currency derivative instruments. Our cash, cash equivalents, and foreign currency derivatives are placed with financial institutions with high credit standings. Our credit risk for derivatives is also mitigated due to the short-term nature of the contracts. Our customer base consists of large numbers of geographically diverse customers dispersed across many industries, and no individual customer comprised more than 10% of our trade accounts receivable as of September 30, 2013 or 2012.
	Fair Value Measurements
	Fair value is defined as the price that would be received from selling an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. 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. Accounting standards prescribe a fair value hierarchy that requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. A financial instrument’s categorization within the fair value hierarchy is based upon the lowest level of input that is significant to the fair value measurement. Three levels of inputs that may be used to measure fair value:
	•	Level 1: quoted prices (unadjusted) in active markets for identical assets or liabilities;
	•	Level 2: inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices in active markets for similar assets or liabilities, quoted prices for identical or similar assets or liabilities in markets that are not active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities; or
	•	Level 3: unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.
	Our significant financial assets and liabilities measured at fair value on a recurring basis as of September 30, 2013 and 2012 were as follows:
		September 30,
		2013		2012
		(in thousands)
	Financial assets
	Cash equivalents—Level 1 (1)	$	56,706	$	231,488
	Forward contracts—Level 2	301		236
		$	57,007	$	231,724
	Financial liabilities
	Forward contracts—Level 2	$	438	$	—
	(1) Money market funds and time deposits.
	Allowance for Doubtful Accounts
	We maintain allowances for doubtful accounts for estimated losses resulting from the inability of our customers to make required payments. In determining the adequacy of the allowance for doubtful accounts, management specifically analyzes individual accounts receivable, historical bad debts, customer concentrations, customer credit-worthiness, current economic conditions, and accounts receivable aging trends. Our allowance for doubtful accounts on trade accounts receivable was $3.0 million as of September 30, 2013, $3.4 million as of September 30, 2012, $3.9 million as of September 30, 2011 and $4.6 million as of September 30, 2010. Uncollectible trade accounts receivable written-off, net of recoveries, were $0.6 million, $0.8 million and $0.8 million in 2013, 2012 and 2011, respectively. Provisions for bad debt expense were $0.2 million, $0.3 million and $0.1 million in 2013, 2012 and 2011, respectively, and are included in general and administrative expenses in the accompanying consolidated statements of operations.
	Financing Receivables and Transfers of Financial Assets
	We periodically provide extended payment terms for software purchases to credit-worthy customers with payment terms up to 24 months. The determination of whether to offer such payment terms is based on the size, nature and credit-worthiness of the customer, and the history of collecting amounts due, without concession, from the customer and customers generally. This determination is based on an internal credit assessment. In making this assessment, we use the Standard & Poor's (S&P) credit rating as our primary credit quality indicator, if available. If a customer, including both commercial and U.S. Federal government, has a S&P bond rating of BBB- or above, we designate the customer as a Tier 1. If a customer does not have a S&P bond rating, or has a S&P bond rating below BBB-, we base our assessment on an internal credit assessment which considers selected balance sheet, operating and liquidity measures, historical payment experience, and current business conditions within the industry or region. We designate these customers as Tier 2 or Tier 3, with Tier 3 being lower credit quality than Tier 2.
	As of September 30, 2013 and 2012, amounts due from customers for contracts with original payment terms greater than twelve months (financing receivables) totaled $53.1 million and $42.5 million, respectively. Accounts receivable and other current assets in the accompanying consolidated balance sheets include current receivables from such contracts totaling $36.1 million and $29.5 million at September 30, 2013 and 2012, respectively, and other assets in the accompanying consolidated balance sheets include long-term receivables from such contracts totaling $17.0 million and $13.0 million at September 30, 2013 and 2012, respectively. As of September 30, 2013 and September 30, 2012, respectively, none of these receivables were past due. Our credit risk assessment for financing receivables was as follows:
		September 30,
		2013		2012
		(in thousands)
	S&P bond rating BBB-1 and above-Tier 1	$	42,189	$	34,017
	Internal Credit Assessment-Tier 2	10,934		8,446
	Internal Credit Assessment-Tier 3	—		—
	Total financing receivables	$	53,123	$	42,463
	We evaluate the need for an allowance for doubtful accounts for estimated losses resulting from the inability of these customers to make required payments. We write off uncollectible trade and financing receivables when we have exhausted all collection avenues. As of September 30, 2013 and 2012, we concluded that all financing receivables were collectible and no reserve for credit losses was recorded. We did not provide a reserve for credit losses or write off any uncollectible financing receivables in 2013, 2012 and 2011.
	We periodically transfer future payments under certain of these contracts to third-party financial institutions on a non-recourse basis. We record such transfers as sales of the related accounts receivable when we surrender control of such receivables. In 2013, 2012 and 2011, we sold $17.0 million, $14.3 million and $4.1 million, respectively, of financing receivables to third-party financial institutions.
	Derivatives
	Generally accepted accounting principles require all derivatives, whether designated in a hedging relationship or not, to be recorded on the balance sheet at fair value. Changes in the derivative’s fair value are recognized currently in earnings unless specific hedge accounting criteria are met.
	Derivatives are financial instruments whose values are derived from one or more underlying financial instruments, such as foreign currency. We enter into derivative transactions, specifically foreign currency forward contracts, to manage our exposure to fluctuations in foreign exchange rates that arise primarily from our foreign currency-denominated receivables and payables. The contracts are primarily denominated in European currencies, typically have maturities of less than three months and require an exchange of foreign currencies for U.S. dollars at maturity of the contracts at rates agreed to at inception of the contracts. We do not enter into or hold derivatives for trading or speculative purposes. Generally, we do not designate foreign currency forward contracts as hedges for accounting purposes, and changes in the fair value of these instruments are recognized immediately in earnings. Because we enter into forward contracts only as an economic hedge, any gain or loss on the underlying foreign-denominated balance would be offset by the loss or gain on the forward contract. Gains and losses on forward contracts and foreign denominated receivables and payables are included in foreign currency net losses.
	As of September 30, 2013 and 2012, we had outstanding forward contracts with notional amounts equivalent to the following:
		September 30,
	Currency Hedged	2013		2012
	(in thousands)
Canadian/U.S. Dollar	$	41,852	$	54,133
Euro/U.S. Dollar	50,902		53,716
Chinese Renminbi/U.S. Dollar	—		3,666
Japanese Yen/U.S. Dollar	6,496		13,415
Swiss Franc/U.S. Dollar	9,678		—
All other	15,506		8,973
Total	$	124,434	$	133,903
The accompanying consolidated balance sheets include net assets of $0.3 million and $0.2 million in other current assets as of September 30, 2013 and September 30, 2012, respectively, and a net liability of $0.4 million in accrued expenses and other current liabilities as of September 30, 2013 related to the fair value of our forward contracts.
Net gains and losses on foreign currency exposures, including realized and unrealized gains and losses on forward contracts, included in foreign currency net losses, were net losses of $2.0 million, $5.9 million and $12.3 million for 2013, 2012 and 2011, respectively. Excluding the underlying foreign currency exposure being hedged, net realized and unrealized gains and losses on forward contracts included in foreign currency net losses, were a net gain of $3.4 million in 2013, and net losses of $3.6 million and $4.1 million in 2012 and 2011, respectively.
In 2011, in connection with our planned acquisition of MKS, we entered into forward contracts to purchase CND$292 million (equivalent to approximately $305 million when we entered into the contracts) to reduce our foreign currency exposure related to changes in the Canadian to U.S. Dollar exchange rate from the time we entered into the agreement to acquire MKS (the purchase price was in Canadian Dollars) and the expected closing date. In 2011, we settled these contracts and recorded a net foreign currency loss of $4.4 million.
Property and Equipment
Property and equipment are recorded at cost and depreciated using the straight-line method over their estimated useful lives. Computer hardware and software are typically amortized over three to five years, and furniture and fixtures over three to eight years. Leasehold improvements are amortized over the shorter of their useful lives or the remaining terms of the related leases. Property and equipment under capital leases are amortized over the lesser of the lease terms or their estimated useful lives. Maintenance and repairs are charged to expense when incurred; additions and improvements are capitalized. When an item is sold or retired, the cost and related accumulated depreciation is relieved, and the resulting gain or loss, if any, is recognized in income.
Software Development Costs
We incur costs to develop computer software to be licensed or otherwise marketed to customers. Research and development costs are expensed as incurred, except for costs of internally developed or externally purchased software that qualify for capitalization. Development costs for software to be sold externally incurred subsequent to the establishment of technological feasibility, but prior to the general release of the product, are capitalized and, upon general release, are amortized using the greater of either the straight-line method over the expected life of the related products or based upon the pattern in which economic benefits related to such assets are realized. The straight-line method is used if it approximates the same amount of expense as that calculated using the ratio that current period gross product revenues bear to total anticipated gross product revenues. No development costs for software to be sold externally were capitalized in 2013, 2012 or 2011. In connection with acquisitions of businesses described in Note E, we capitalized software of $54.0 million and $44.9 million in 2013 and 2011, respectively. These assets are included in acquired intangible assets in the accompanying consolidated balance sheets.
Goodwill, Acquired Intangible Assets and Long-lived Assets
Goodwill is the amount by which the purchase price in a business acquisition exceeds the fair values of net identifiable assets on the date of purchase.
Goodwill is evaluated for impairment annually, or more frequently if events or changes in circumstances indicate that the asset might be impaired. Factors we consider important, on an overall company basis and reportable-segment basis, when applicable, that could trigger an impairment review include significant underperformance relative to historical or projected future operating results, significant changes in our use of the acquired assets or the strategy for our overall business, significant negative industry or economic trends, a significant decline in our stock price for a sustained period and a reduction of our market capitalization relative to net book value. We perform our annual goodwill assessment as of the end of the third quarter. Our goodwill impairment assessment was based on the guidance prescribed in ASU 2011-8. On July 2, 2011, the estimated fair value of each reporting unit was approximately double its carrying value or higher. Because our fair value was well in excess of our carrying value on that date, and there were no other indicators that our goodwill had become impaired since that date, we elected to perform a qualitative assessment to test each reporting unit’s goodwill for impairment. Based on our qualitative assessment, if we determine that the fair value of a reporting unit is more likely than not (i.e., a likelihood of more than 50 percent) to be greater than its carrying amount no additional testing will be performed. If we determine that the fair value of a reporting unit is more likely than not to be less than its carrying amount, the two step impairment test will be performed. In the first step, we compare the fair value of each reporting unit to its carrying value. If the fair value of the reporting unit exceeds the carrying value of the net assets assigned to that unit, goodwill is not considered impaired and we are not required to perform further testing. If the carrying value of the net assets assigned to the reporting unit exceeds the fair value of the reporting unit, then we must perform the second step of the impairment test in order to determine the implied fair value of the reporting unit’s goodwill. If the carrying value of a reporting unit’s goodwill exceeds its implied fair value, then we would record an impairment loss equal to the difference.
Long-lived assets primarily include property and equipment and acquired intangible assets with finite lives (including purchased software, customer lists and trademarks). Purchased software is amortized over 3 to 10 years, customer lists are amortized over 4 to 12 years and trademarks are amortized over 3 to 7 years. We review long-lived assets for impairment when events or changes in business circumstances indicate that the carrying amount of the assets may not be fully recoverable or that the useful lives of those assets are no longer appropriate. Each impairment test is based on a comparison of the undiscounted cash flows to the recorded value of the asset. If impairment is indicated, the asset is written down to its estimated fair value based on a discounted cash flow analysis.
Advertising Expenses
Advertising costs are expensed as incurred. Total advertising expenses incurred were $4.2 million, $2.8 million and $2.6 million in 2013, 2012 and 2011, respectively.
Income Taxes
Our income tax expense includes U.S. and international income taxes. Certain items of income and expense are not reported in tax returns and financial statements in the same year. The tax effects of these differences are reported as deferred tax assets and liabilities. Deferred tax assets are recognized for the estimated future tax effects of deductible temporary differences and tax operating loss and credit carryforwards. Changes in deferred tax assets and liabilities are recorded in the provision for income taxes. We assess the likelihood that our deferred tax assets will be recovered from future taxable income and, to the extent we believe that it is more likely than not that all or a portion of deferred tax assets will not be realized, we establish a valuation allowance. To the extent we establish a valuation allowance or increase this allowance in a period, we include an expense within the tax provision in the consolidated statement of operations.
Comprehensive Income (Loss)
Comprehensive income (loss) consists of net income (loss) and other comprehensive income (loss), which includes foreign currency translation adjustments and changes in unrecognized actuarial gains and losses (net of tax) related to pension benefits. For the purposes of comprehensive income disclosures, we do not record tax provisions or benefits for the net changes in the foreign currency translation adjustment, as we intend to reinvest permanently undistributed earnings of our foreign subsidiaries. Accumulated other comprehensive loss is reported as a component of stockholders’ equity and, as of September 30, 2013 and 2012, was comprised of cumulative translation adjustment losses of $0.4 million and $7.6 million, respectively, and unrecognized actuarial losses related to pension benefits of $74.4 million ($50.8 million net of tax) and $96.4 million ($64.9 million net of tax), respectively.
Earnings per Share (EPS)
Basic EPS is calculated by dividing net income by the weighted average number of shares outstanding during the period. Unvested restricted shares, although legally issued and outstanding, are not considered outstanding for purposes of calculating basic earnings per share. Diluted EPS is calculated by dividing net income by the weighted average number of shares outstanding plus the dilutive effect, if any, of outstanding stock options, restricted shares and restricted stock units using the treasury stock method. The calculation of the dilutive effect of outstanding equity awards under the treasury stock method includes consideration of proceeds from the assumed exercise of stock options, unrecognized compensation expense and any tax benefits as additional proceeds.
The following table presents the calculation for both basic and diluted EPS:
	Year ended September 30,
	2013		2012			2011
	(in thousands, except per share data)
Net income (loss)	$	143,769	$	(35,398	)	$	85,424
Weighted average shares outstanding	119,473		118,705			117,579
Dilutive effect of employee stock options, restricted shares and restricted stock units	1,767		—			3,395
Diluted weighted average shares outstanding	121,240		118,705			120,974
Basic earnings (loss) per share	$	1.2	$	(0.30	)	$	0.73
Diluted earnings (loss) per share	$	1.19	$	(0.30	)	$	0.71
Due to the net loss generated in 2012, the dilutive effect of stock options, restricted shares and restricted stock units totaling 2.3 million was excluded from the computation of diluted EPS for that period as the effect would have been anti-dilutive. In 2011, stock options to purchase 0.2 million shares were excluded from the computation of diluted EPS as their effect would have been anti-dilutive.
Stock-Based Compensation
We measure the compensation cost of employee services received in exchange for an award of equity instruments based on the grant-date fair value of the award. That cost is recognized over the period during which an employee is required to provide service in exchange for the award. See Note K for a description of the types of stock-based awards granted, the compensation expense related to such awards and detail of equity-based awards outstanding. See Note G for detail of the tax benefit recognized in the consolidated statement of operations related to stock-based compensation.
Related Party Transaction
On November 15, 2011, we entered into a consulting agreement with Professor Michael Porter, a director of PTC. In consideration for providing consulting services, we made a restricted stock grant valued at $0.2 million (9,402 shares) to Professor Porter, half of which vested on November 15, 2012 and the other half of which vested on November 15, 2013. Professor Porter also earned $60,000 in fees for participation in strategy events on behalf of PTC under the agreement. This agreement expired on November 15, 2013.
Recent Accounting Pronouncements
Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists
In July 2013, the Financial Accounting Standards Board (the FASB) issued Accounting Standards Update (ASU) 2013-11,
Income Taxes (Topic 740)—Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists. ASU 2011-13 generally requires that an unrecognized tax benefit, or a portion of an unrecognized tax benefit, shall be presented in the financial statements as a reduction to a deferred tax asset for a net operating loss carryforward, a similar tax loss, or a tax credit carryforward. ASU 2013-11 is effective for us in our first quarter of fiscal 2015. We are currently evaluating the impact of ASU 2013-11 on our consolidated financial statements.
Disclosures about Offsetting Assets and Liabilities
In January 2013, the FASB issued ASU 2013-01, Balance Sheet (Topic 210)—Clarifying the Scope of Disclosures about Offsetting Assets and Liabilities. ASU 2013-01 clarifies the scope of disclosures about offsetting assets and liabilities originally outlined in ASU 2011-11 issued in December 2011. ASU 2013-01 limits the scope of the disclosures to recognized derivative instruments accounted for in accordance with ASC 815, Derivatives and Hedging. For assets and liabilities within the scope of the standard, entities are required to disclose certain quantitative information in a tabular format, separately for assets and liabilities. The information required includes: a) the gross amounts of those recognized assets and those recognized liabilities; b) the amounts offset to determine the net amounts presented in the statement of financial position; c) the net amounts presented in the statement of financial position; d) the amounts subject to an enforceable master netting arrangement or similar agreement not otherwise included in (b); and e) the net amount after deducting the amounts in (d) from the amounts in (c). The disclosures are effective for us in our first quarter of fiscal 2014. We are currently evaluating the impact of ASU 2013-01 on our consolidated financial statements.
Reporting Amounts Reclassified Out of Accumulated Other Comprehensive Income
In February 2013, the FASB issued ASU No. 2013-02, Comprehensive Income (Topic 220)—Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income (ASU 2013-02). ASU 2013-02 requires an entity to report the effect of significant reclassifications out of accumulated other comprehensive income on the respective line items in net income if the amount being reclassified is required under U.S. GAAP to be reclassified in its entirety to net income. For other amounts that are not required under U.S. GAAP to be reclassified in their entirety from accumulated other comprehensive income to net income in the same reporting period, an entity is required to cross-reference other disclosures required under U.S. GAAP that provide additional detail about those amounts. ASU 2013-02 is effective for us in our first quarter of fiscal 2014. We are currently evaluating the impact of ASU 2013-02 on our consolidated financial statements.

Restructuring_Charges

Restructuring Charges	12 Months Ended
	Sep. 30, 2013
Restructuring [Abstract]	'
Restructuring Charges	'
	Restructuring Charges
	During 2013, as part of our ongoing strategy to reduce costs and improve profitability, we implemented restructuring actions and recorded restructuring charges of $52.2 million (including $52.4 million related to 2013 actions, net of a $0.2 million credit related to prior period restructuring reserves). The 2013 restructuring charges included $51.0 million for severance and related costs associated with 553 employees and $1.5 million of charges related to excess facilities.
	In 2012, we adopted a plan to restructure our workforce and related facilities to enhance long-term profitability and recorded restructuring charges of $24.9 million. The restructuring charges included $24.4 million for severance and related costs associated with 209 employees and a $0.5 million charge related to facility consolidations.
	The following table summarizes restructuring charges reserve activity for the three years ended September 30, 2013:
					For the year ended September 30, 2013
					2013 Restructuring Charges
		Prior Period Restructuring Charges			Employee Severance			Facility Closures			Consolidated Total
					and Related Benefits			and Other Costs
		(in thousands)
	Balance, October 1, 2010	$	1,165		$	—		$	—		$	1,165
	Cash disbursements	(502		)	—			—			(502		)
	Foreign currency impact	3			—			—			3
	Balance, September 30, 2011	666			—			—			666
	Charges to operations	24,928									24,928
	Cash disbursements	(20,947		)	—			—			(20,947		)
	Foreign currency impact	(186		)	—			—			(186		)
	Balance, September 30, 2012	4,461			—			—			4,461
	Charges to operations	(251		)	50,954			1,494			52,197
	Cash disbursements	(4,225		)	(31,781		)	(1,193		)	(37,199		)
	Foreign currency impact	15			60			(5		)	70
	Balance, September 30, 2013	$	—		$	19,233		$	296		$	19,529
	The accrual for facility closures and related costs is included in accrued expenses in the consolidated balance sheet, and the accrual for employee severance and related benefits is included in accrued compensation and benefits in the consolidated balance sheet.

Property_And_Equipment

Property And Equipment	12 Months Ended
	Sep. 30, 2013
Property, Plant and Equipment [Abstract]	'
Property And Equipment	'
	Property and Equipment
	Property and equipment consisted of the following:
		September 30,
		2013			2012
		(in thousands)
	Computer hardware and software	$	217,724		$	224,558
	Furniture and fixtures	19,211			20,878
	Leasehold improvements	35,289			46,393
	Gross property and equipment	272,224			291,829
	Accumulated depreciation and amortization	(207,572		)	(228,363		)
	Net property and equipment	$	64,652		$	63,466
	Depreciation expense was $31.5 million, $30.4 million and $28.7 million in 2013, 2012 and 2011, respectively.

Acquisitions

Acquisitions	12 Months Ended
	Sep. 30, 2013
Business Combinations [Abstract]	'
Acquisition	'
	Acquisitions
	In 2013, we completed the acquisitions of Servigistics, Enigma and NetIDEAS. In 2011, we completed the acquisitions of MKS and 4CS. The results of operations of these acquired businesses have been included in our consolidated financial statements beginning on their respective acquisition dates. Servigistics, Enigma and NetIDEAS collectively added $94.9 million to our 2013 revenue. MKS and 4CS collectively added $81.5 million and $26.8 million to our 2012 and 2011 revenue, respectively.
	Acquisition-related costs were $9.9 million, $3.8 million and $7.8 million in 2013, 2012 and 2011, respectively. Acquisition-related costs include direct costs of completing an acquisition (e.g., investment banker fees, professional fees, including legal and valuation services) and expenses related to acquisition integration activities (e.g., professional fees, severance, and retention bonuses). These costs have been classified in general and administrative expenses in the accompanying consolidated statements of operations.
	NetIDEAS and Enigma
	In the fourth quarter of 2013, we acquired all of the outstanding common stock of NetIDEAS, Inc. (a privately-held U.S.- based company) and Enigma Information Systems LTD (a privately-held company with operations in Israel, the U.S., the U.K and Sweden) for a total of $25.0 million, net of $1.0 million of cash acquired. The acquisitions resulted in goodwill of $14.3 million, intangible assets of $15.2 million and deferred tax liabilities related to the intangible assets of $5.3 million. Our results of operations prior to these acquisitions, if presented on a pro forma basis, would not differ materially from our reported results.
	Servigistics
	On October 2, 2012, we acquired all of the outstanding shares of capital stock of Servigistics, Inc. (a privately held developer of a suite of service lifecycle management (SLM) software solutions) for $220.8 million in cash, net of $1.4 million cash acquired. We acquired Servigistics to expand our products that support service organizations within manufacturing companies, including managing service and spare parts information and the delivery of service for warranty and product support processes. Servigistics had annualized revenues of approximately $80.0 million and approximately 400 employees.
	The acquisition of Servigistics has been accounted for as a business combination. Assets acquired and liabilities assumed have been recorded at their estimated fair values as of the October 2, 2012 acquisition date. The fair values of intangible assets were based on valuations using an income approach, with estimates and assumptions provided by management of Servigistics and PTC. The process for estimating the fair values of identifiable intangible assets and certain tangible assets requires the use of significant estimates and assumptions, including estimating future cash flows and developing appropriate discount rates. The excess of the purchase price over the tangible assets, identifiable intangible assets and assumed liabilities was recorded as goodwill.
	Based upon a valuation, the total purchase price allocation was as follows:
		(in thousands)
	Goodwill	$	139,833
	Identifiable intangible assets	118,300
	Cash	1,355
	Accounts receivable	20,536
	Property and equipment	3,588
	Deferred support revenue	(11,714		)
	Deferred tax assets and liabilities, net	(35,566		)
	Net assumed liabilities	(14,159		)
	Total purchase price allocation	222,173
	Less: Servigistics cash acquired	(1,355		)
	Total purchase price allocation, net of cash acquired	$	220,818
	The purchase price allocation resulted in $139.8 million of goodwill, the majority of which will not be deductible for income tax purposes. Of the acquired goodwill, $127.0 million was allocated to our software products segment and $12.8 million was allocated to our services segment. Intangible assets of $118.3 million includes purchased software of $49.9 million, customer relationships of $66.0 million and trademarks of $2.4 million, which are being amortized over weighted average useful lives of 9 years, 10 years and 7 years, respectively, based upon the pattern in which economic benefits related to such assets are expected to be realized. In accounting for the business combination we recorded net deferred tax liabilities of $35.6 million, primarily related to the tax effect of the acquired intangible assets other than goodwill and the fair value adjustment for deferred revenue that are not deductible for income tax purposes. The resulting amount of goodwill reflects our expectations of the following synergistic benefits: (1) the potential to sell Servigistics products into our customer base and to sell PTC products into Servigistics' customer base; (2) our intention to leverage our larger sales force and our intellectual property to attract new contracts and revenue; and (3) our intention to leverage our established presence in global markets.
	The unaudited financial information in the table below summarizes the combined results of operations of PTC and Servigistics, on a pro forma basis, as though the companies had been combined as of the beginning of PTC's fiscal year 2012. The pro forma information for all periods presented includes the effects of business combination accounting resulting from the acquisition as though the acquisition had been consummated as of the beginning of fiscal year 2012, including amortization charges from acquired intangible assets, the fair value adjustment of acquired deferred support revenue being recorded in fiscal year 2012 versus fiscal year 2013, interest expense on borrowings in connection with the acquisition, the exclusion of acquisition-related costs and the related tax effects. In 2013, we recorded a tax benefit of $32.6 million to decrease our valuation allowance as a result of Servigistics' net deferred tax liabilities recorded in accounting for the business combination. This tax benefit is excluded from the 2013 pro forma results and is reflected in the 2012 pro forma results because the deferred tax liabilities would have resulted in a lower tax charge when we established a valuation allowance against all of our U.S. net deferred tax assets in the fourth quarter of 2012. The pro forma financial information is presented for comparative purposes only and is not necessarily indicative of the results of operations that actually would have been achieved if the acquisition had taken place at the beginning of 2012.
	Unaudited Pro Forma Financial Information
		Year ended September 30,
		2013			2012
		(in millions, except per share amounts)
	Revenue	$	1,296.60		$	1,328.50
	Net income (loss)	$	116.5		$	(11.6	)
	Earnings (loss) per share—Basic	$	0.98		$	(0.10	)
	Earnings (loss) per share—Diluted	$	0.96		$	(0.10	)
	4CS
	In the fourth quarter of 2011, we acquired all of the outstanding common stock of 4C Solutions, Inc. (4CS), a U.S.-based privately-held company with approximately 200 employees, for $14.9 million in cash (net of $0.1 million of cash acquired). Our results of operations prior to this acquisition, if presented on a pro forma basis, would not differ materially from our reported results.
	MKS
	On May 31, 2011, we acquired all of the outstanding common stock of MKS Inc. (a publicly-held company based in Ontario, Canada) for $265.2 million, net of $33.2 million of cash acquired.
	MKS’s results of operations have been included in PTC’s consolidated financial statements beginning May 31, 2011. The unaudited financial information in the table below summarizes the combined results of operations of PTC and MKS, on a pro forma basis, as though the companies had been combined as of the beginning of PTC’s fiscal year 2010. The pro forma information for all periods presented also includes the effects of business combination accounting resulting from the acquisition, including amortization charges from acquired intangible assets, stock-based compensation charges for unvested stock options, interest expense on borrowings in connection with the acquisition, and the related tax effects as though the acquisition had been consummated as of the beginning of 2010. These pro forma results exclude the impact of the purchase accounting adjustment to deferred revenue and the transaction costs included in the historical results and the related tax effects. The pro forma financial information is presented for comparative purposes only and is not necessarily indicative of the results of operations that actually would have been achieved if the acquisition had taken place at the beginning of 2010. For the year ended September 30, 2011, the pro forma financial information is based on PTC’s results of operations for the year ended September 30, 2011, which includes MKS’s results beginning May 31, 2011, combined with MKS’s results of operations for the eight months ended May 30, 2011.
	Unaudited Pro Forma Financial Information
		Year ended
		30-Sep-11
		(in millions, except per share amounts)
	Revenue	$	1,227.80
	Net income	$	93
	Earnings per share—Basic	$	0.79
	Earnings per share—Diluted	$	0.77

Goodwill_And_Acquired_Intangib

Goodwill And Acquired Intangible Assets	12 Months Ended
	Sep. 30, 2013
Goodwill and Intangible Assets Disclosure [Abstract]	'
Goodwill And Intangible Assets	'
	Goodwill and Acquired Intangible Assets
	We have two reportable segments: (1) software products and (2) services. As of September 30, 2013 and 2012, goodwill and acquired intangible assets in the aggregate attributable to our software products reportable segment was $979.3 million and $768.1 million, respectively, and attributable to our services reportable segment was $62.9 million and $28.1 million, respectively. Goodwill is tested for impairment at least annually, or on an interim basis if an event occurs or circumstances change that would, more likely than not, reduce the fair value of the reporting segment below its carrying value. We completed our annual impairment review as of June 29, 2013 based on a qualitative assessment. Our qualitative assessment included company specific (financial performance and long-range plans), industry, and macroeconomic factors, as well as a sensitivity analysis of key model assumptions. Based on our qualitative assessment, we believe it is more-likely-than-not that the fair values of our reporting units exceed their carrying values and no further impairment testing is required. Through September 30, 2013, there have not been any events or changes in circumstances that indicate that the carrying values of goodwill or acquired intangible assets may not be recoverable.
	Goodwill and acquired intangible assets consisted of the following:
		30-Sep-13									30-Sep-12
		Gross			Accumulated			Net Book			Gross		Accumulated		Net Book
		Carrying			Amortization			Value			Carrying		Amortization		Value
		Amount									Amount
		(in thousands)
	Goodwill (not amortized)							$	769,095						$	610,347
	Intangible assets with finite lives (amortized) (1):
	Purchased software	$	233,566		$	148,127		$	85,439		$	177,166	$	127,250	$	49,916
	Capitalized software	22,877			22,877			—			22,877		22,877		—
	Customer lists and relationships	304,434			120,338			184,096			227,097		93,215		133,882
	Trademarks and trade names	13,427			10,097			3,330			11,013		8,967		2,046
	Other	3,784			3,528			256			3,437		3,396		41
		$	578,088		$	304,967		$	273,121		$	441,590	$	255,705	$	185,885
	Total goodwill and acquired intangible assets							$	1,042,216						$	796,232
	(1)    The weighted average useful lives of purchased software, customer lists and relationships, trademarks and trade names and other intangible assets with a remaining net book value are 8 years, 10 years, 7 years and 3 years, respectively.
	The changes in the carrying amounts of goodwill from October 1, 2012 to September 30, 2013 are due to the impact of acquisitions (described in Note E) and to foreign currency translation adjustments related to those asset balances that are recorded in non-U.S. currencies.
	Changes in goodwill presented by reportable segment were as follows:
		Software			Services			Total
		Products			Segment
		Segment
		(in thousands)
	Balance, October 1, 2012	$	588,443		$	24,951		$	613,394
	Acquisition of 4CS	(950		)	—			(950		)
	Foreign currency translation adjustments	(2,024		)	(73		)	(2,097		)
	Balance, September 30, 2012	585,469			24,878			610,347
	Acquisition of Servigistics	127,033			12,800			139,833
	Acquisition of NetIDEAS	—			10,196			10,196
	Acquisition of Enigma	3,570			581			4,151
	Foreign currency translation and other adjustments	4,476			92			4,568
	Balance, September 30, 2013	$	720,548		$	48,547		$	769,095
	The aggregate amortization expense for intangible assets with finite lives recorded for the years ended September 30, 2013, 2012 and 2011 was reflected in our consolidated statements of operations as follows:
		Year ended September 30,
		2013			2012			2011
		(in thousands)
	Amortization of acquired intangible assets	$	26,486		$	20,303		$	18,319
	Cost of license revenue	18,586			15,819			15,393
	Total amortization expense	$	45,072		$	36,122		$	33,712
	The estimated aggregate future amortization expense for intangible assets with finite lives remaining as of September 30, 2013 is $48.9 million for 2014, $47.1 million for 2015, $39.7 million for 2016, $35.9 million for 2017, $31.9 million for 2018, and $69.6 million thereafter.

Income_Taxes

Income Taxes	12 Months Ended
	Sep. 30, 2012
Income Tax Disclosure [Abstract]	'
Income Taxes	'
	Income Taxes
	Our income (loss) before income taxes consisted of the following:
		Year ended September 30,
		2013				2012				2011
		(in thousands)
	Domestic	$	6,112			$	(11,422	)		$	(23,984	)
	Foreign	120,122				132,158				128,532
	Total income before income taxes	$	126,234			$	120,736			$	104,548
	Our (benefit) provision for income taxes consisted of the following:
		Year ended September 30,
		2013				2012				2011
		(in thousands)
	Current:
	Federal	$	7,081			$	8,534			$	22,849
	State	1,512				1,733				(192		)
	Foreign	13,586				41,101				31,530
		22,179				51,368				54,187
	Deferred:
	Federal	(38,224		)		106,041				(31,303		)
	State	(4,718		)		7,706				(2,176		)
	Foreign	3,228				(8,981		)		(1,584		)
		(39,714		)		104,766				(35,063		)
	Total (benefit) provision for income taxes	$	(17,535	)		$	156,134			$	19,124
	The reconciliation between the statutory federal income tax rate and our effective income tax rate is shown below:
		Year ended September 30,
		2013			2012			2011
	Statutory federal income tax rate	35	%		35	%		35	%
	Change in valuation allowance	(32	)%		103	%		3	%
	State income taxes, net of federal tax benefit	1	%		—	%		(2	)%
	Federal and state research and development credits	(1	)%		(1	)%		(5	)%
	Tax audit and examination settlements	(1	)%		1	%		—	%
	Foreign rate differences	(26	)%		(16	)%		(15	)%
	Foreign withholding tax	5	%		3	%		—	%
	Subsidiary reorganization	—	%		3	%		1	%
	Other, net	5	%		1	%		1	%
	Effective income tax rate	(14	)%		129	%		18	%
	In 2013, our effective tax rate was a benefit of 14% on pre-tax income of $126.2 million.  Our effective tax rate was lower than the 35% statutory federal income tax rate due, in large part, to the reversal of a portion of the valuation allowance against deferred tax assets (primarily the U.S.).  We recorded benefits of $36.7 million resulting from 2013 acquisitions as described below, and a benefit of $7.9 million related to the release of a valuation allowance as a result of a pension gain recorded in accumulated other comprehensive income in equity.  Additionally, our 2013 tax provision reflects a $2.0 million provision related to a research and development (R&D) cost sharing prepayment by a foreign subsidiary to the U.S. A similar prepayment was made in 2012 resulting in a $7.8 million provision in that year. This impact is included in foreign rate differences in our effective tax rate reconciliation above. This impact was offset by a corresponding increase in our valuation allowance in the U.S. Other factors impacting the rate include, our corporate structure in which our foreign taxes are at an effective tax rate lower than the U.S. rate, foreign withholding taxes of $6.0 million and non-cash tax benefits of $5.3 million, included in foreign rate differences, recorded as a result of the conclusion of tax audits in several foreign jurisdictions.
	Acquisitions in the year were accounted for as business combinations.  Assets acquired, including the fair value of acquired tangible assets, intangible assets (including finite-lived acquired intangible assets totaling $133.5 million) and assumed liabilities were recorded, and we recorded deferred tax liabilities of $40.9 million primarily related to the tax effect of the acquired intangible assets that are not deductible for income tax purposes.  These deferred tax liabilities reduced our deferred tax asset balance and resulted in a tax benefit of $36.7 million to decrease our valuation allowance in jurisdictions where we have recorded a valuation allowance (primarily the U.S.).  As this decrease in the valuation allowance is not part of the accounting for business combinations (the fair value of the assets acquired and liabilities assumed), it was recorded as an income tax benefit.
	In 2012, our effective tax rate was higher than the 35% statutory federal income tax rate due primarily to the recording of a $124.5 million charge to the income tax provision related to the establishment of a valuation allowance on U.S. net deferred tax assets. This increase was offset in part as a result of our corporate structure in which our foreign taxes are at an effective tax rate lower than the U.S. rate. Our 2012 provision included $4.2 million related to the restructuring of our Canadian operations that resulted in a change in the tax status of the foreign legal entity and a discrete non-cash charge of $1.4 million related to the impact of a Japanese legislative change on our Japan entities' deferred tax assets. Additionally, our 2012 tax provision reflects a $7.8 million provision related to a research and development cost sharing prepayment by a foreign subsidiary to the U.S. We made a comparable prepayment in 2011. Foreign rate differences in our effective tax rate reconciliation above include the effect of the current year deferred charges associated with intercompany transactions.
	In 2011, our effective tax rate was lower than the 35% statutory federal income tax rate due primarily to our corporate structure in which our foreign taxes are at an effective tax rate lower than the U.S. rate and a $2.3 million tax benefit related to R&D triggered by a retroactive extension of the R&D tax credit enacted in the first quarter of 2011. Our 2011 tax provision reflects a $7.5 million provision related to a research and development cost sharing prepayment by a foreign subsidiary to the U.S. A similar prepayment was made in 2010 resulting in a $6.0 million provision in that year. As a result, the net increase to the 2011 provision was $1.5 million. This impact is included in foreign rate differences in our effective tax rate reconciliation above. Also included in foreign rate differences is the effect of permanent items in foreign jurisdictions and the current year deferred charge associated with intercompany transactions.
	In 2011, we continued the reorganization of our legal entity structure which began in 2010 to support our tax and cash planning. The 2011 reorganization resulted in a $46.4 million taxable gain in the U.S. The tax on this gain was offset in part by the reversal of a deferred tax liability for unremitted earnings of a foreign subsidiary of $6.5 million (established in 2010 in contemplation of this transaction), the recognition of foreign tax credits previously not benefitted, and foreign tax credits generated as a result of this transaction.
	At September 30, 2013 and 2012, income taxes payable and income tax accruals recorded in accrued income taxes, other current liabilities, and other liabilities on the accompanying consolidated balance sheets were $14.4 million ($7.1 million in accrued income taxes, $2.1 million in other current liabilities and $5.2 million in other liabilities) and $16.4 million ($0.8 million in accrued income taxes, $4.4 million in other current liabilities and $11.2 million in other liabilities), respectively. At September 30, 2013 and 2012, prepaid taxes recorded in prepaid expenses on the accompanying consolidated balance sheets were $11.5 million and $0.7 million, respectively. We made net income tax payments of $35.4 million, $53.0 million and $28.1 million in 2013, 2012 and 2011, respectively.
	The significant temporary differences that created deferred tax assets and liabilities are shown below:
		September 30,
		2013				2012
		(in thousands)
	Deferred tax assets:
	Net operating loss carryforwards	$	47,770			$	23,879
	Foreign tax credits	5,994				—
	Capitalized research and development expense	51,237				59,562
	Pension benefits	30,870				35,676
	Deferred revenue	63,976				58,791
	Stock-based compensation	18,045				17,137
	Accrual for litigation	—				16,310
	Other reserves not currently deductible	19,343				12,058
	Amortization of intangible assets	5,772				10,658
	Other tax credits	31,263				23,899
	Depreciation	3,077				5,582
	Other	4,396				5,984
	Gross deferred tax assets	281,743				269,536
	Valuation allowance	(156,547		)		(170,404		)
	Total deferred tax assets	125,196				99,132
	Deferred tax liabilities:
Acquired intangible assets not deductible	(88,134		)		(53,030		)
Pension prepayments	(15,607		)		(12,475		)
Deferred revenue	(12,592		)		(21,693		)
Other	(4,463		)		(651		)
Total deferred tax liabilities	(120,796		)		(87,849		)
Net deferred tax assets	$	4,400			$	11,283
In the fourth quarter of 2012, we recorded a $124.5 million non-cash charge to the income tax provision to establish a valuation allowance against substantially all of our U.S. net deferred tax assets. We weighed all available evidence, both positive and negative, and concluded that it was more likely than not (a likelihood of more than 50 percent) that substantially all of our U.S. deferred tax assets will not be realized. The realization of deferred tax assets, including carryforwards and deductible temporary differences, depends on the existence of sufficient taxable income of the same character during the carryback or carryforward period. We considered all sources of taxable income available to realize the deferred tax assets, including the future reversal of existing temporary differences, future taxable income exclusive of reversing temporary differences and carryforwards, taxable income in prior carryback years and tax-planning strategies.
For U.S. tax return purposes, net operating loss (NOL) carryforwards and tax credits are generally available to be carried forward to future years, subject to certain limitations. At September 30, 2013, we had U.S. federal NOL carryforwards of $79.0 million that expire in 2019 to 2033. These include NOL carryforwards from acquisitions of $55.7 million, consisting of $41.9 million from Servigistics and Enigma and $13.8 million from prior acquisitions. The utilization of these NOL carryforwards is limited as a result of the change in ownership rules under Internal Revenue Code Section 382. NOL's totaling $39.3 million relate to windfall tax benefits that have not been recognized, the impact of which will be recorded in APIC when realized.
As of September 30, 2013, we had Federal R&D credit carryforwards of $14.7 million, which expire beginning in 2029 and ending in 2033 and Massachusetts R&D credit carryforwards of $19.4 million, which expire beginning in 2015 and ending in 2028. We also had foreign tax credits of $6.0 million expiring in 2023. A full valuation allowance is recorded against these carryforwards.
We also have NOL carryforwards in non-U.S. jurisdictions totaling $143.9 million, the majority of which do not expire. We also have non-U.S. tax credit carryforwards of $6.8 million that expire beginning in 2022 and ending in 2033 There are limitations imposed on the utilization of such NOLs that could restrict the recognition of any tax benefits.
As of September 30, 2013, we have a valuation allowance of $129.9 million against net deferred tax assets in the U.S. and a remaining valuation allowance of $26.6 million against net deferred tax assets in certain foreign jurisdictions. The valuation allowance recorded against net deferred tax assets of certain foreign jurisdictions is established primarily for our net operating loss carryforwards, the majority of which do not expire. There are limitations imposed on the utilization of such net operating losses that could restrict the recognition of any tax benefits.
The changes to the valuation allowance were primarily due to:
	Year ended September 30,
	2013				2012				2011
	(in millions)
Valuation allowance beginning of year	$	170.4			$	38.6			$	40.5
Net release of valuation allowance (1)	(44.6		)		—				(2.4		)
Establish valuation allowance in the U.S.	—				124.5				—
Net increase/decrease in deferred tax assets for foreign jurisdictions with a full valuation allowance	1.9				(2.1		)		(0.8		)
Establish valuation allowance for acquired businesses	12.1				—				—
Establish valuation allowance in foreign jurisdictions	—				0.6				—
Adjust deferred tax asset and valuation allowance in the U.S.	16.7				8.8				1.3
Valuation allowance end of year	156.5				170.4				$	38.6
-1	In 2013, this is attributable to recognition of deferred tax liabilities recorded in connection with accounting for 2013 acquisitions and a reduction in deferred tax assets associated with our U.S. pension plan, both of which are described above.
Our policy is to record estimated interest and penalties related to the underpayment of income taxes as a component of our income tax provision. In 2013, we recorded net interest of a $1.2 million benefit, and in both 2012 and 2011 a provision of $0.3 million. We recorded penalty expense of $0.1 million in 2012. In 2013 and 2011, we had no tax penalty expense in our income tax provision. As of September 30, 2013 and 2012, we had accrued $1.1 million and $2.3 million, respectively, of net estimated interest expense related to income tax accruals. We had $0.1 million of accrued tax penalties as of September 30, 2013 and September 30, 2012.
	Year ended September 30,
Unrecognized tax benefits	2013				2012				2011
	(in millions)
Unrecognized tax benefit beginning of year	$	19.1			$	16.2			$	15.9
Tax positions related to current year:
Additions	1				3.4				1.1
Tax positions related to prior years:
Additions	1.8				1.4				0.7
Reductions	(6.3		)		(0.5		)		(1.5		)
Settlements	(0.7		)		—				—
Statute expirations	(1.2		)		(1.4		)		—
Unrecognized tax benefit end of year	$	13.7			$	19.1			$	16.2
If all of our unrecognized tax benefits as of September 30, 2013 were to become recognizable in the future, we would record a benefit to the income tax provision of $12.9 million (which would be partially offset by an increase in the U.S. valuation allowance of $7.6 million) and a credit to additional paid-in capital (APIC) of $0.8 million. Although we believe our tax estimates are appropriate, the final determination of tax audits and any related litigation could result in favorable or unfavorable changes in our estimates. We anticipate the settlement of tax audits may be finalized within the next twelve months and could result in a decrease in our unrecognized tax benefits of up to $2 million.
In the normal course of business, PTC and its subsidiaries are examined by various taxing authorities, including the IRS in the United States. As of September 30, 2013, we remained subject to examination in the following major tax jurisdictions for the tax years indicated:
Major Tax Jurisdiction		Open Years
United States		2010 through 2013
Germany		2011 through 2013
France		2010 through 2013
Japan		2008 through 2013
Ireland		2009 through 2013
We incurred expenses related to stock-based compensation in 2013, 2012 and 2011 of $48.8 million, $51.3 million and $45.4 million, respectively. Accounting for the tax effects of stock-based awards requires that we establish a deferred tax asset as the compensation is recognized for financial reporting prior to recognizing the tax deductions. The tax benefit recognized in the consolidated statement of operations related to stock-based compensation totaled $2.7 million, $3.9 million and $15.2 million in 2013, 2012 and 2011, respectively. Upon the settlement of the stock-based awards (i.e., exercise, vesting, forfeiture or cancellation), the actual tax deduction is compared with the cumulative financial reporting compensation cost and any excess tax deduction is considered a windfall tax benefit, and is tracked in a “windfall tax benefit pool” to offset any future tax deduction shortfalls and will be recorded as increases to APIC in the period when the tax deduction reduces income taxes payable. In 2013, 2012 and 2011, we recorded windfall tax benefits of $0.3 million, $1.1 million and $9.4 million to APIC, respectively. We follow the with-and-without approach for the direct effects of windfall tax deductions to determine the timing of the recognition of benefits for windfall tax deductions. We follow the direct method for indirect effects. As of September 30, 2013, the tax effect of windfall tax deductions which had not yet reduced taxes payable was $23 million.
We have not provided for U.S. income taxes or foreign withholding taxes on foreign unrepatriated earnings as it is our current intention to permanently reinvest these earnings outside the U.S. unless it can be done with no significant tax cost. If we decide to change this assertion in the future to repatriate any additional non-U.S. earnings, we may be required to establish a deferred tax liability on such earnings. The cumulative amount of undistributed earnings of our subsidiaries for which U.S. income taxes have not been provided totaled approximately $378 million and $267 million as of September 30, 2013 and 2012, respectively. The amount of unrecognized deferred tax liability on the undistributed earnings cannot be practicably determined at this time. However, we do currently have an outstanding loan receivable in the amount of $154.4 million owed to the U.S. from our top tier foreign subsidiary that can be repaid to repatriate foreign generated cash to the U.S. without tax cost.

Long_Term_Debt

Long Term Debt	12 Months Ended
	Sep. 30, 2012
Debt Disclosure [Abstract]	'
Debt Disclosure [Text Block]	'
	Debt
	Credit Agreement
	In August 2012, we entered into a multi-currency credit facility (the credit facility) with a syndicate of ten banks for which JPMorgan Chase Bank, N.A. acts as Administrative Agent. The credit facility replaced a revolving credit facility with the same banks (the previous credit facility) entered into in August 2010. We expect to use the credit facility for general corporate purposes, including acquisitions of businesses and working capital requirements. As of September 30, 2013, the fair value of our credit facility approximates our book value.
	The credit facility consists of a $150 million term loan and a $300 million revolving loan commitment, and may be increased by an additional $150 million (in the form of revolving loans or term loans, or a combination thereof) if the existing or additional lenders are willing to make such increased commitments. The revolving loan commitment does not require amortization of principal. The term loan requires prepayment of principal at the end of each calendar quarter. The revolving loan and term loan may be repaid in whole or in part prior to the scheduled maturity dates at our option without penalty or premium. The credit facility matures on August 16, 2017, when all remaining amounts outstanding will be due and payable in full. We are required to make principal payments under the term loan of $15.0 million, $15.0 million, $22.5 million and $90.0 million in 2014, 2015, 2016 and 2017, respectively.
	PTC is the sole borrower under the credit facility. The obligations under the credit facility are guaranteed by PTC’s material domestic subsidiaries and 65% of the voting equity interests of PTC’s material first-tier foreign subsidiaries are pledged as collateral for the obligations.
	As of September 30, 2013, we had $258.1 million outstanding under the credit facility (including $230 million borrowed in September 2012 in connection with our October 2012 acquisition of Servigistics described in Note E) comprised of the $142.5 million term loan and a $115.6 million revolving loan. As of September 30, 2012, we had $370 million outstanding under the credit facility. Loans under the credit facility bear interest at variable rates which reset every 30 to 180 days depending on the rate and period selected by PTC as described below. As of September 30, 2013, the annual rate on the term loan was 1.5625% (which reset on November 15, 2013 to 1.50%) and the annual interest rate on the revolving loan was 1.5625%, which will reset on December 13, 2013. Interest rates on borrowings outstanding under the credit facility range from 1.25% to 1.5% above an adjusted LIBO rate for Eurodollar-based borrowings or would range from 0.25% to 0.5% above the defined base rate (the greater of the Prime Rate, the Federal Funds Effective Rate plus 0.005%, or an adjusted LIBO rate plus 1%) for base rate borrowings, in each case based upon PTC’s leverage ratio. Additionally, PTC may borrow certain foreign currencies at rates set in the same range above the respective London interbank offered interest rates for those currencies, based on PTC’s leverage ratio. A quarterly commitment fee on the undrawn portion of the credit facility is required, ranging from 0.20% to 0.30% per annum, based upon PTC’s leverage ratio.
	The credit facility limits PTC’s and its subsidiaries’ ability to, among other things: incur additional indebtedness; incur liens or guarantee obligations; pay dividends (other than to PTC) and make other distributions; make investments and enter into joint ventures; dispose of assets; and engage in transactions with affiliates, except on an arms-length basis. Under the credit facility, PTC and its material domestic subsidiaries may not invest cash or property in, or loan to, PTC’s foreign subsidiaries in aggregate amounts exceeding $50 million for any purpose and an additional $75 million for acquisitions of businesses. In addition, under the credit facility, PTC and its subsidiaries must maintain the following financial ratios:
	•	a leverage ratio, defined as consolidated funded indebtedness to consolidated trailing four quarters EBITDA, of no greater than 2.50 to 1.00 at any time; and
	•	a fixed charge coverage ratio, defined as the ratio of consolidated trailing four quarters EBITDA less consolidated capital expenditures to consolidated fixed charges, of no less than 3.50 to 1.00 at any time.
	As of September 30, 2013, our leverage ratio was 0.94 to 1.00, our fixed charge coverage ratio was 18.43 to 1.00 and we were in compliance with all financial and operating covenants of the credit facility.
	Any failure to comply with the financial or operating covenants of the credit facility would prevent PTC from being able to borrow additional funds, and would constitute a default, permitting the lenders to, among other things, accelerate the amounts outstanding, including all accrued interest and unpaid fees, under the credit facility and to terminate the credit facility. A change in control of PTC, as defined in the agreement, also constitutes an event of default, permitting the lenders to accelerate the indebtedness and terminate the credit facility.
	We incurred $1.8 million and $1.0 million of origination costs in 2012 and 2011, respectively, in connection with entering into and amending the new and previous credit facilities. These origination costs were recorded as deferred debt issuance costs when incurred and are being expensed over the remaining term of the new credit facility.
	In 2013, 2012 and 2011, we paid $5.8 million, $3.7 million and $1.5 million, respectively, of interest on the credit facilities. The average interest rate on borrowings outstanding during 2013, 2012 and 2011 was approximately 1.7%, 1.8% and 2.1%, respectively.

Commitments_And_Contingencies

Commitments And Contingencies	12 Months Ended
	Sep. 30, 2012
Commitments and Contingencies Disclosure [Abstract]	'
Commitments And Contingencies	'
	Commitments and Contingencies
	Leasing Arrangements
	We lease office facilities under operating leases expiring at various dates through 2023. Certain leases require us to pay for taxes, insurance, maintenance and other operating expenses in addition to rent. Lease expense was $38.4 million, $37.8 million and $35.7 million in 2013, 2012 and 2011, respectively. At September 30, 2013, our future minimum lease payments under noncancellable operating leases are as follows:
	Year ending September 30,	(in thousands)
	2014	$	40,870
	2015	35,580
	2016	28,165
	2017	22,463
	2018	18,972
	Thereafter	52,762
	Total minimum lease payments	$	198,812
	Amounts above include future minimum lease payments for our corporate headquarters facility located in Needham, Massachusetts. The lease for our headquarters facility was renewed in the first quarter of 2011 for an additional 10 years (through November 2022) with a ten year renewal option through November 2032. Under the terms of the lease, we are paying approximately $7.4 million in annual base rent plus operating expenses. The amended lease provides for $12.8 million in landlord funding for leasehold improvements which we expect to complete in 2014. We will capitalize these leasehold improvements as the assets are placed in service and amortize them to expense over the shorter of the lease term or their expected useful life. The $12.8 million of funding by the landlord is not included in the table above and reduces rent expense over the lease term.
	As of September 30, 2013 and 2012, we had letters of credit and bank guarantees outstanding of $3.9 million (of which $1.0 million was collateralized) and $3.7 million (of which $1.2 million was collateralized), respectively, primarily related to our corporate headquarters lease.
	Legal and Regulatory Matters
	China Investigation
	We have been cooperating to provide information to the U.S. Securities and Exchange Commission and the Department of Justice concerning payments and expenses by certain of our business partners in China and/or by employees of our Chinese subsidiary that raise questions concerning compliance with laws, including the U.S. Foreign Corrupt Practices Act.  Although we have begun discussions with the SEC and Department of Justice regarding possible resolution of this matter, we continue to respond to requests for information and cannot predict when or how this matter may be resolved. Resolution of this matter could include fines and penalties; however we are unable to estimate an amount that could be associated with any resolution and, accordingly, we have not recorded a liability for this matter.  If we are required to record a liability for this matter, or to pay fines or penalties associated with this matter, this could materially impact our results for the period in which the liability is recorded or such amounts are paid. Further, any settlement or other resolution of this matter could have collateral effects on our business in China, the United States and elsewhere.
	We terminated certain employees and business partners in China in connection with this matter, which may have an adverse impact on our level of sales in China until replacements for those employees and business partners are in place and productive. Revenue from China has historically represented  6% to 7% of our total revenue.
	Other Legal Proceedings
	We are subject to various legal proceedings and claims that arise in the ordinary course of business. We do not believe that resolving the legal proceedings and claims that we are currently subject to will have a material adverse impact on our financial condition, results of operations or cash flows. However, the results of legal proceedings cannot be predicted with certainty. Should any of these legal proceedings and claims be resolved against us, the operating results for a particular reporting period could be adversely affected.
	Accruals
	With respect to legal proceedings and claims, we record an accrual for a contingency when it is both probable that a liability has been incurred and the amount of the loss can be reasonably estimated. For legal proceedings and claims for which the likelihood that a liability has been incurred is more than remote but less than probable, we estimate the range of possible outcomes to be up to $1 million. As of September 30, 2013, we had a legal proceedings and claims accrual of $0.3 million.
	Guarantees and Indemnification Obligations
	We enter into standard indemnification agreements in the ordinary course of our business. Pursuant to such agreements with our business partners or customers, we indemnify, hold harmless, and agree to reimburse the indemnified party for losses suffered or incurred by the indemnified party, generally in connection with patent, copyright or other intellectual property infringement claims by any third party with respect to our products, as well as claims relating to property damage or personal injury resulting from the performance of services by us or our subcontractors. The maximum potential amount of future payments we could be required to make under these indemnification agreements is unlimited. Historically, our costs to defend lawsuits or settle claims relating to such indemnity agreements have been minimal and we accordingly believe the estimated fair value of liabilities under these agreements is immaterial.
	We warrant that our software products will perform in all material respects in accordance with our standard published specifications in effect at the time of delivery of the licensed products for a specified period of time. Additionally, we generally warrant that our consulting services will be performed consistent with generally accepted industry standards. In most cases, liability for these warranties is capped. If necessary, we would provide for the estimated cost of product and service warranties based on specific warranty claims and claim history; however, we have not incurred significant cost under our product or services warranties. As a result, we believe the estimated fair value of these liabilities is immaterial.

Stockholders_Equity

Stockholders' Equity	12 Months Ended
	Sep. 30, 2012
Stockholders' Equity Note [Abstract]	'
Stockholders' Equity	'
	Stockholders’ Equity
	Preferred Stock
	We may issue up to 5.0 million shares of our preferred stock in one or more series. 0.5 million of these shares are designated as Series A Junior Participating Preferred Stock. Our Board of Directors is authorized to fix the rights and terms for any series of preferred stock without additional shareholder approval.
	Common Stock
	Our Articles of Organization authorize us to issue up to 500 million shares of our common stock. Our Board of Directors has periodically authorized the repurchase of shares of our common stock. For the period of October 1, 2012 through September 30, 2013, we were authorized to repurchase up to $100 million worth of shares with cash from operations. We repurchased 3.1 million shares at a cost of $74.9 million in 2013, 1.6 million shares at a cost of $35.0 million in 2012, and 2.6 million shares at a cost of $54.9 million in 2011. All shares of our common stock repurchased are automatically restored to the status of authorized and unissued. Future repurchases of shares will reduce our cash balances.

Equity_Incentive_Plan

Equity Incentive Plan	12 Months Ended
	Sep. 30, 2012
Share-based Compensation, Allocation and Classification in Financial Statements [Abstract]	'
Equity Incentive Plan	'
	Equity Incentive Plan
	Our 2000 Equity Incentive Plan (2000 Plan) provides for grants of nonqualified and incentive stock options, common stock, restricted stock, restricted stock units and stock appreciation rights to employees, directors, officers and consultants. We award restricted stock units as the principal equity incentive awards, including certain performance-based awards that are earned based on achieving performance criteria established by the Compensation Committee of our Board of Directors generally on or prior to the grant date. Each restricted stock unit represents the contingent right to receive one share of our common stock.
	The fair value of restricted shares and restricted stock units granted in 2013, 2012 and 2011 was based on the fair market value of our stock on the date of grant. The weighted average fair value per share of restricted shares and restricted stock units granted in 2013, 2012 and 2011 was $22.87, $20.16 and $21.91, respectively. Pre-vesting forfeiture rates for purposes of determining stock-based compensation for all periods presented were estimated by us to be 0% for directors and executive officers, 4% for vice president-level employees and 7% for all other employees.
	The following table shows total stock-based compensation expense recorded from our stock-based awards as reflected in our consolidated statements of operations:
		Year ended September 30,
		2013			2012			2011
		(in thousands)
	Cost of license revenue	$	21		$	22		$	15
	Cost of service revenue	6,134			5,682			5,011
	Cost of support revenue	3,324			3,234			2,721
	Sales and marketing	11,326			13,809			11,428
	Research and development	8,590			8,761			8,547
	General and administrative	19,392			19,797			17,680
	Total stock-based compensation expense	$	48,787		$	51,305		$	45,402
	As of September 30, 2013, total unrecognized compensation cost related to unvested restricted shares and restricted stock units expected to vest was approximately $60 million and the weighted average remaining recognition period for unvested awards was 12 months.
	As of September 30, 2013, 6.7 million shares of common stock were available for grant under the 2000 Plan and 5.3 million shares of common stock were reserved for issuance upon the exercise of stock options and vesting of restricted stock units granted and outstanding.
		Shares		Weighted			Aggregate Intrinsic Value as of September 30, 2013
				Average
				Grant Date
				Fair Value
	Restricted stock activity for the year ended September 30, 2013	(in thousands except grant date fair value data)
	Balance of nonvested outstanding restricted stock October 1, 2012	72		$	24.49
	Vested	(67	)	$	24.72
	Balance of nonvested outstanding restricted stock September 30, 2013	5		$	21.27		$	134
		Shares		Weighted			Aggregate Intrinsic Value as of September 30, 2013
				Average
				Grant Date
				Fair Value
	Restricted stock unit activity for the year ended September 30, 2013	(in thousands except grant date fair value data)
	Balance of nonvested outstanding restricted stock units October 1, 2012	5,134		$	19.99
	Granted	2,654		$	22.87
	Vested	(2,188	)	$	19.26
	Forfeited or not earned	(414	)	$	21.26
	Balance of nonvested outstanding restricted stock units September 30, 2013	5,186		$	21.67		$	147,684
			Restricted Stock Units
	Restricted stock unit grants		Performance-based (1)		Time-based (2)
			(Number of Units in thousands)
	Year ended September 30, 2013		422		2,232
	-1	Of these performance-based RSUs, the performance conditions were achieved for approximately 200 thousand shares, half of which vested in November 2013, with the remainder to vest in two substantially equal installments in November 2014 and 2015. The remaining approximately 200 thousand shares will be eligible to vest in two substantially equal installments on the later of November 15, 2014 and November 15, 2015 and the date the Compensation Committee determines the extent to which performance criteria have been achieved. RSUs not earned for earlier periods are eligible to be earned in 2014 or 2015.
	-2	The time-based RSUs were issued to directors and employees, including some of our executive officers. The time-based RSUs issued to employees and executives will vest in three substantially equal annual installments from the date of grant. Substantially all of the time-based RSUs issued to our directors will vest one year from the date of grant.
	Additionally, 0.3 million performance-based shares that were granted to our executive officers in prior years vested in November 2013 as the performance criteria were achieved.
	Until July 2005, we generally granted stock options. For those options, the option exercise price was typically the fair market value at the date of grant, and they generally vested over four years and expired ten years from the date of grant.
		Shares		Weighted			Weighted Average		Aggregate
				Average			Remaining		Intrinsic
				Exercise			Contractual Term		Value
				Price
	Stock option activity for the year ended September 30, 2013	(in thousands)					(in years)		(in thousands)
	Outstanding:
	Balance, October 1, 2012	573		$	10.36
	Cancelled	(7	)	$	7.56
	Exercised	(467	)	$	10.45
	Balance, September 30, 2013	99		$	10.13		0.82		$	1,817
	Exercisable September 30, 2013	99		$	10.13		0.82		$	1,814
		Year ended September 30,
		2013			2012			2011
	Value of stock option and stock-based award activity	(in thousands)
	Total intrinsic value of stock options exercised	$	6,525		$	31,746		$	15,983
	Total fair value of restricted stock and restricted stock unit awards vested	$	48,083		$	65,574		$	68,772
	In 2013, shares issued upon vesting of restricted stock units were net of 0.7 million shares retained by us to cover employee tax withholdings of $15.0 million. In 2012, shares issued upon vesting of restricted stock units were net of 0.9 million shares retained by us to cover employee tax withholdings of $21.0 million. In 2011, shares issued upon vesting of restricted stock and restricted stock units were net of 1.0 million shares retained by us to cover employee tax withholdings of $22.5 million.

Employee_Benefit_Plan

Employee Benefit Plan	12 Months Ended
	Sep. 30, 2012
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]	'
Employee Benefit Plan	'
	Employee Benefit Plan
	We offer a savings plan to eligible U.S. employees. The plan is intended to qualify under Section 401(k) of the Internal Revenue Code. Participating employees may defer a portion of their pre-tax compensation, as defined, but not more than statutory limits. We contribute 50% of the amount contributed by the employee, up to a maximum of 6% of the employee’s earnings. Our matching contributions vest at a rate of 25% per year of service, with full vesting after 4 years of service. We made matching contributions of $5.0 million, $4.9 million, and $4.4 million in 2013, 2012 and 2011, respectively.

Pension_Plans

Pension Plans	12 Months Ended
	Sep. 30, 2012
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]	'
Pension Plans	'
	Pension Plans
	We maintain defined benefit pension plans primarily covering certain employees of Computervision, which we acquired in 1998, and of CoCreate, which we acquired in 2008. Benefits are based upon length of service and average compensation with vesting after one to five years of service. The pension cost was actuarially computed using assumptions applicable to each subsidiary plan and economic environment. We adjust our pension liability related to our plans due to changes in actuarial assumptions and performance of plan investments, as shown below.
	Effective April 1, 1990, the benefits under the U.S. pension plan were frozen indefinitely. We contribute all amounts deemed necessary on an actuarial basis to satisfy IRS funding requirements. Effective in 1998, benefits under one of the international plans were frozen indefinitely.
	The following table presents the actuarial assumptions used in accounting for the pension plans:
		U.S. Plan									International Plans
		2013			2012			2011			2013		2012			2011
	Weighted average assumptions used to determine benefit obligations at September 30 measurement date:
	Discount rate	4.9	%		4	%		4.5	%		3.3	%	3.4	%		4.8	%
	Rate of increase in future compensation (1)	—	%		—	%		—	%		3	%	3	%		3	%
	Weighted average assumptions used to determine net periodic pension cost for fiscal years ended September 30:
	Discount rate	4	%		4.5	%		5	%		3.4	%	4.8	%		4	%
	Rate of increase in future compensation	—	%		—	%		—	%		3	%	3	%		2.7	%
	Rate of return on plan assets	7.25	%		7.25	%		7.25	%		5.4	%	5.4	%		5.6	%
	-1	The rate of increase in future compensation is weighted for all plans, ongoing and frozen (with a 0% increase for frozen plans). The weighted rate of increase for ongoing non-U.S. plans was 3% at September 30, 2013 and 2012.
	In selecting the expected long-term rate of return on assets, we considered the current investment portfolio and the investment return goals in the plans’ investment policy statements. We, with input from the plans’ professional investment managers and actuaries, also considered the average rate of earnings expected on the funds invested or to be invested to provide plan benefits. This process included determining expected returns for the various asset classes that comprise the plans’ target asset allocation. This basis for selecting the long-term asset return assumptions is consistent with the prior year. Using generally accepted diversification techniques, the plans’ assets, in aggregate and at the individual portfolio level, are invested so that the total portfolio risk exposure and risk-adjusted returns best meet the plans’ long-term liabilities to employees. Plan asset allocations are reviewed periodically and rebalanced to achieve target allocation among the asset categories when necessary.
	As of September 30, 2013, for the U.S. plan and the international plans, the weighted long-term rate of return assumption is 7.25% and 5.70%, respectively. These rates of return, together with the assumptions used to determine the benefit obligations as of September 30, 2013 in the table above, will be used to determine our 2014 net periodic pension cost, which we expect to be approximately $3 million.
	The actuarially computed components of net periodic pension cost recognized in our consolidated statements of operations for each year are shown below:
		U.S. Plan											International Plans
		2013				2012				2011			2013				2012			2011
		(in thousands)
	Interest cost of projected benefit obligation	$	4,989			$	5,490			$	5,627		$	2,384			$	2,554		$	2,382
	Service cost	—				—				—			2,017				1,882			1,782
	Expected return on plan assets	(6,128		)		(5,412		)		(5,373		)	(2,126		)		(1,929		)	(2,254		)
	Amortization of prior service cost	—				—				—			(6		)		(7		)	—
	Recognized actuarial loss	3,152				2,967				2,549			1,248				341			334
	Net periodic pension cost	$	2,013			$	3,045			$	2,803		$	3,517			$	2,841		$	2,244
	The following tables display the change in benefit obligation and the change in the plan assets and funded status of the plans as well as the amounts recognized in our consolidated balance sheets:
		U.S. Plan								International Plans							Total
		Year ended September 30,
		2013				2012				2013			2012				2013			2012
		(in thousands)
	Change in benefit obligation:
	Projected benefit obligation—beginning of year	$	129,701			$	123,645			$	71,408		$	55,382			$	201,109		$	179,027
	Service cost	—				—				2,017			1,882				2,017			1,882
	Interest cost	4,989				5,490				2,384			2,554				7,373			8,044
	Actuarial (gain) loss	(12,728		)		8,449				1,426			14,724				(11,302		)	23,173
	Foreign exchange impact	—				—				629			(2,132		)		629			(2,132		)
	Participant contributions	—				—				432			421				432			421
	Benefits paid	(8,584		)		(7,883		)		(1,732		)	(1,423		)		(10,316		)	(9,306		)
	Plan curtailments	—				—				(1,608		)	—				(1,608		)	—
	Projected benefit obligation—end of year	$	113,378			$	129,701			$	74,956		$	71,408			$	188,334		$	201,109
	Change in plan assets and funded status:
	Plan assets at fair value—beginning of year	$	86,016			$	74,367			$	38,817		$	36,414			$	124,833		$	110,781
	Actual return on plan assets	10,438				13,995				3,172			2,504				13,610			16,499
	Employer contributions	6,961				5,537				3,008			2,129				9,969			7,666
	Participant contributions	—				—				432			421				432			421
	Foreign exchange impact	—				—				(335		)	(1,228		)		(335		)	(1,228		)
	Benefits paid	(8,584		)		(7,883		)		(1,732		)	(1,423		)		(10,316		)	(9,306		)
	Plan assets at fair value—end of year	94,831				86,016				43,362			38,817				138,193			124,833
	Projected benefit obligation—end of year	113,378				129,701				74,956			71,408				188,334			201,109
	Underfunded status	$	(18,547	)		$	(43,685	)		$	(31,594	)	$	(32,591	)		$	(50,141	)	$	(76,276	)
	Accumulated benefit obligation—end of year	$	113,378			$	129,701			$	71,513		$	66,287			$	184,891		$	195,988
	Amounts recognized in the balance sheet:
	Non-current liability	$	(18,547	)		$	(43,685	)		$	(31,594	)	$	(32,591	)		$	(50,141	)	$	(76,276	)
	Amounts in accumulated other comprehensive loss:
	Unrecognized actuarial loss	$	55,180			$	75,370			$	19,177		$	21,068			$	74,357		$	96,438
	In the first, second and fourth quarters of 2013, we terminated employees in Germany resulting in plan curtailments and a reduction in projected benefits obligations totaling $1.6 million.
	We expect to recognize approximately $3 million of the unrecognized actuarial loss as of September 30, 2013 as a component of net periodic pension cost in 2014.
	The following table shows the percentage of total plan assets for each major category of plan assets:
		U.S. Plan						International Plans
		September 30,
		2013			2012			2013			2012
	Asset category:
Equity securities	62	%		65	%		51	%		46	%
Fixed income securities	38	%		33	%		27	%		27	%
Insurance company	—	%		—	%		19	%		25	%
Cash	—	%		2	%		3	%		2	%
	100	%		100	%		100	%		100	%
We periodically review the pension plans’ investments in the various asset classes. The current asset allocation target is 60% equity securities and 40% fixed income securities for the U.S. plan and a CoCreate plan in Germany, and 100% fixed income securities for the other international plans. The fixed income securities for the other international plans primarily include investments held with insurance companies with fixed returns. The plans’ investment managers are provided specific guidelines under which they are to invest the assets assigned to them. In general, investment managers are expected to remain fully invested in their asset class with further limitations on risk as related to investments in a single security, portfolio turnover and credit quality.
The U.S. plan and the German CoCreate plan investment policies prohibit the use of derivatives associated with leverage and speculation or investments in securities issued by PTC, except through index-related strategies and/or commingled funds. An investment committee oversees management of the pension plans’ assets. Plan assets consist primarily of investments in mutual funds invested in equity and fixed income securities.
In 2013 and 2012, our actual return on plan assets was $13.6 million and $16.5 million, respectively, compared to a loss of $1.6 million in 2011.
Based on actuarial valuations and additional voluntary contributions, we contributed $10.0 million, $7.7 million, and $2.2 million in 2013, 2012 and 2011, respectively, to the plans. We expect to make contributions totaling approximately $12 million in 2014.
As of September 30, 2013, benefit payments expected to be paid over the next ten years are outlined in the following table:
	U.S. Plan				International				Total
					Plans
	(in thousands)
Year ending September 30,
2014	$	4,898			$	1,727			$	6,625
2015	5,286				1,785				7,071
2016	5,698				1,947				7,645
2017	6,141				2,140				8,281
2018	6,633				2,514				9,147
2019 to 2023	40,715				18,620				59,335
Fair Value of Plan Assets
The U.S. Plan assets are comprised primarily of investments in common/collective trusts. Common/collective trusts are valued at the net asset value of shares held as reported by the trustee. The underlying investments in the common/collective trusts are publicly traded U.S. and international stocks, U.S. treasury securities and other fixed-income securities. Although the net asset values of the common/collective funds are determined by observable prices of the underlying securities, they are classified as Level 2 because the units of the common/collective trusts do not trade in open public markets. The fair value of the underlying investments in common/collective equity securities are based upon stock-exchange prices. The fair value of the underlying investments in common/collective fixed income securities are based on evaluated prices that reflect significant observable market information such as reported trades, actual trade information of similar securities, benchmark yields, broker/dealer quotes, issuer spreads, bids, offers and relevant credit information.
	30-Sep-13
	Level 1				Level 2				Level 3			Total
	(in thousands)
U.S. plan assets-common/collective trusts:
Fixed income securities:
U.S. Treasury, agency and other local government and non-corporate	$	—			$	15,690			$	—		$	15,690
Mortgage-backed	—				10,179				—			10,179
Corporate investment grade	—				9,254				—			9,254
Corporate high yield	—				941				—			941
U.S. equity securities:
Large capitalization stocks	—				37,567				—			37,567
Small capitalization stocks	—				9,553				—			9,553
U.S. real estate investment trusts	—				77				—			77
International equity securities:
Large/mid capitalization stocks	—				11,294				—			11,294
Small capitalization stocks	—				110				—			110
Emerging large/mid capitalization stocks	—				83				—			83
Commodities	—				83				—			83
	$	—			$	94,831			$	—		$	94,831
The International Plan assets are comprised primarily of investments in a trust and an insurance company. The underlying investments in the trust are primarily publicly traded European DJ EuroStoxx50 equities and European governmental fixed income securities. They are classified as Level 1 because the underlying units of the trust are traded in open public markets. The fair value of the underlying investments in equity securities and fixed income are based upon publicly-traded exchange prices.
	30-Sep-13
	Level 1				Level 2				Level 3			Total
	(in thousands)
International plan assets:
Fixed income securities:
Government	$	6,455			$	—			$	—		$	6,455
Europe corporate investment grade	5,390				—				—			5,390
Europe large capitalization stocks	21,952				—				—			21,952
Insurance company funds (1)	—				8,429				—			8,429
Cash	1,136				—				—			1,136
	$	34,933			$	8,429			$	—		$	43,362
(1) These investments are comprised primarily of funds invested with an insurance company in Japan with a guaranteed rate of return. The insurance company invests these assets primarily in government and corporate bonds.

Segment_Information

Segment Information	12 Months Ended
	Sep. 30, 2012
Segment Reporting [Abstract]	'
Segment Information	'
	Segment Information
	We operate within a single industry segment—computer software and related services. Operating segments as defined under GAAP are components of an enterprise about which separate financial information is available that is evaluated regularly by the chief operating decision maker, or decision-making group, in deciding how to allocate resources and in assessing performance. Our chief operating decision maker is our President and Chief Executive Officer. We have two operating and reportable segments: (1) Software Products, which includes license and related support revenue (including updates and technical support) for all our products except training-related products; and (2) Services, which includes consulting, implementation, training, computer-based training products, including support thereon, and other services revenue. We do not allocate sales and marketing or administrative expenses to our operating segments as these activities are managed on a consolidated basis.
	The revenue and operating income attributable to these operating segments are summarized as follows:
		Year ended September 30,
		2013			2012			2011
		(in thousands)
	Software Products segment revenue	$	977,523		$	935,472		$	875,511
	Services segment revenue	316,018			320,207			291,438
	Total revenue	$	1,293,541		$	1,255,679		$	1,166,949
	Operating income: (1) (2)
	Software Products segment	$	605,963		$	598,344		$	557,879
	Services segment (3)	37,131			41,793			22,577
	Sales and marketing expenses	(378,771		)	(392,956		)	(353,051		)
	General and administrative expenses	(136,999		)	(119,085		)	(110,291		)
	Total operating income	$	127,324		$	128,096		$	117,114
	Other (expense) income, net	(1,090		)	(7,360		)	(12,566		)
	Income before income taxes	$	126,234		$	120,736		$	104,548
	-1	We recorded restructuring charges of $52.2 million in 2013. Software Products included $17.7 million; Services included $11.3 million; sales and marketing expenses included $18.1 million; and general and administrative expenses included $5.1 million of the total restructuring charges recorded in 2013. We recorded restructuring charges of $24.9 million in 2012. Software Products included $4.1 million; Services included $4.0 million; sales and marketing expenses included $15.2 million; and general and administrative expenses included $1.6 million of the total restructuring charges recorded in 2012.
	-2	The Software Products segment operating income includes depreciation and amortization of $27.3 million, $25.4 million, and $24.8 million in 2013, 2012, and 2011, respectively. The Services segment operating income includes depreciation and amortization of $5.0 million, $3.6 million, and $3.8 million in 2013, 2012, and 2011, respectively.
	-3	In the first quarter of 2011, we made a strategic decision to enter into a contract with a customer in the automotive industry, for which we expected our costs to exceed our revenue by approximately $5 million. Services segment operating income in 2011 included immediate recognition of the approximately $5 million estimated loss on this contract and resulted in a reduction of service margins by approximately 2%.
	We report revenue by the following three product areas:
	•	CAD: PTC Creo®, including PTC Creo Parametric and PTC Creo Elements/Direct®, and PTC Mathcad®.
	•	Extended PLM: our PLM solutions (primarily PTC Windchill® and PTC Creo ViewTM ), our ALM solutions (primarily PTC Integrity™) and our SCM Solutions (primarily PTC Windchill FlexPLM®).
	•	SLM: PTC Arbortext® and PTC Servigistics®.
		Year ended September 30,
		2013			2012			2011
		(in thousands)
	CAD	$	552,510		$	573,457		$	587,824
	Extended PLM	572,313			604,339			503,128
	SLM	168,718			77,883			75,997
	Total revenue	$	1,293,541		$	1,255,679		$	1,166,949
	Data for the geographic regions in which we operate is presented below. Amounts for the years ended September 30, 2012 and 2011 include immaterial reclassifications between geographic regions made to conform to the current year classification.
		Year ended September 30,
		2013			2012			2011
		(in thousands)
	Revenue:
	Americas (1)	$	522,788		$	479,932		$	429,213
	Europe (2)	479,877			480,287			466,540
	Pacific Rim	161,587			160,834			147,992
	Japan	129,289			134,626			123,204
	Total revenue	$	1,293,541		$	1,255,679		$	1,166,949
		September 30,
		2013			2012			2011
		(in thousands)
	Long-lived tangible assets:
	Americas (3)	$	49,788		$	46,083		$	42,767
	Europe	5,557			6,649			6,989
	Asia-Pacific	9,307			10,734			12,813
	Total long-lived tangible assets	$	64,652		$	63,466		$	62,569
	-1	Includes revenue in the United States totaling $485.2 million, $453.2 million and $408.0 million for 2013, 2012 and 2011, respectively.
	-2	Includes revenue in Germany totaling $167.2 million, $188.3 million and $173.3 million for 2013, 2012 and 2011, respectively.
	-3	Substantially all of the Americas long-lived tangible assets are located in the United States.
	Our international revenue is presented based on the location of our customer. We license products to customers worldwide. Our sales and marketing operations outside the United States are conducted principally through our international sales subsidiaries throughout Europe and the Asia-Pacific regions. Intercompany sales and transfers between geographic areas are accounted for at prices that are designed to be representative of unaffiliated party transactions.

Subsequent_Events

Subsequent Events	12 Months Ended
	Sep. 30, 2012
Subsequent Events [Abstract]	'
Subsequent Events	'
	Subsequent Events
	Restricted Stock Unit Grants
	On November 11, 2013, we granted the restricted stock units shown in the table below. The performance-based RSUs were issued to employees, including some of our executive officers, and are earned based on achievement of performance conditions established by the Compensation Committee of our Board of Directors on the grant date and are also subject to service conditions. Of these performance-based RSUs:
	• 24 thousand are eligible to vest to the extent earned in three substantially equal installments on the later of November 15, 2014 or the date the Compensation Committee determines the extent to which the applicable performance criteria have been achieved, November 15, 2015 and November 15, 2016, and
	•317 thousand are eligible to vest to the extent earned in three substantially equal installments on (i) the later of November 15, 2014 or the date the Compensation Committee determines the extent to which the applicable performance criteria have been achieved, (ii) the later of November 15, 2015 or the date the Compensation Committee determines the extent to which the applicable performance criteria have been achieved, and (iii) the later of November 15, 2016 or the date the Compensation Committee determines the extent to which the applicable performance criteria have been achieved; RSUs not earned for a period may be earned in subsequent periods.
	The time-based RSUs were issued to employees, including some of our executive officers, and will vest in three substantially equal annual installments from the grant date.
		Performance-Based RSUs		Time-Based RSUs
		(in thousands)
	Number Granted	341		748
	Intrinsic Value	$	10,959	$	24,060

Summary_Of_Significant_Account1

Summary Of Significant Accounting Policies (Policy)	12 Months Ended
	Sep. 30, 2013
Accounting Policies [Abstract]	'
Foreign Currency Translation	'
	Foreign Currency Translation
	For our non-U.S. operations where the functional currency is the local currency, we translate assets and liabilities at exchange rates in effect at the balance sheet date and record translation adjustments in stockholders’ equity. For our non-U.S. operations where the U.S. dollar is the functional currency, we remeasure monetary assets and liabilities using exchange rates in effect at the balance sheet date and nonmonetary assets and liabilities at historical rates and record resulting exchange gains or losses in foreign currency net losses in the consolidated statement of operations. We translate income statement amounts at average rates for the period. Transaction gains and losses are recorded in foreign currency net losses in the consolidated statements of operations.
Revenue Recognition	'
	Revenue Recognition
	We derive revenues from three primary sources: (1) software licenses, (2) services, and (3) support. We exercise judgment and use estimates in connection with determining the amounts of software license and services revenues to be recognized in each accounting period. We recognize revenue when: (1) persuasive evidence of an arrangement exists, (2) delivery has occurred (generally, FOB shipping point or electronic distribution), (3) the fee is fixed or determinable, and (4) collection is probable.
	Our software is distributed primarily through our direct sales force. In addition, we have an indirect distribution channel through alliances with resellers. Revenue arrangements with resellers are recognized on a sell-through basis; that is, when we deliver the product to the end-user customer. We record consideration given to a reseller as a reduction of revenue to the extent we have recorded revenue from the reseller. We do not offer contractual rights of return, stock balancing, or price protection to our resellers, and actual product returns from them have been insignificant to date. As a result, we do not maintain reserves for reseller product returns.
	At the time of each sale transaction, we must make an assessment of the collectability of the amount due from the customer. Revenue is only recognized at that time if management deems that collection is probable. In making this assessment, we consider customer credit-worthiness and historical payment experience. At that same time, we assess whether fees are fixed or determinable and free of contingencies or significant uncertainties. In assessing whether the fee is fixed or determinable, we consider the payment terms of the transaction, including transactions with payment terms that extend beyond our customary payment terms, and our collection experience in similar transactions without making concessions, among other factors. We have periodically provided financing to credit-worthy customers with payment terms up to 24 months. If the fee is determined not to be fixed or determinable, revenue is recognized only as payments become due from the customer, provided that all other revenue recognition criteria are met. Our software license arrangements generally do not include customer acceptance provisions. However, if an arrangement includes an acceptance provision, we record revenue only upon the earlier of (1) receipt of written acceptance from the customer or (2) expiration of the acceptance period.
	Our software arrangements often include implementation and consulting services that are sold under consulting engagement contracts or as part of the software license arrangement. When we determine that such services are not essential to the functionality of the licensed software, we record revenue separately for the license and service elements of these arrangements, provided that appropriate evidence of fair value exists for the undelivered services (see discussion below). Generally, we consider that a service is not essential to the functionality of the software based on various factors, including if the services may be provided by independent third parties experienced in providing such consulting and implementation in coordination with dedicated customer personnel and whether the services result in significant modification or customization of the software functionality. When consulting services qualify for separate accounting, consulting revenues under time and materials billing arrangements are recognized as the services are performed. Consulting revenues under fixed-priced contracts are generally recognized as the services are performed using a proportionate performance model with hours or costs as the input method of attribution. When we provide consulting services considered essential to the functionality of the software, the arrangement does not qualify for separate accounting of the license and service elements, and the license revenue is recognized together with the consulting services using the percentage-of-completion method of contract accounting. Under such arrangements, consideration is recognized as the services are performed as measured by an observable input. In these circumstances, we separate license revenue from service revenue for income statement presentation by allocating vendor specific objective evidence (VSOE) of fair value of the consulting services as service revenue and the residual portion as license revenue. Under the percentage-of-completion method, we estimate the stage of completion of contracts with fixed or “not to exceed” fees based on hours or costs incurred to date as compared with estimated total project hours or costs at completion. Adjustments to estimates to complete are made in the periods in which facts resulting in a change become known. When total cost estimates exceed revenues, we accrue for the estimated losses when identified. The use of the proportionate performance and percentage-of-completion methods of accounting require significant judgment relative to estimating total contract costs or hours (hours being a proxy for costs), including assumptions relative to the length of time to complete the project, the nature and complexity of the work to be performed and anticipated changes in salaries and other costs.
	We generally use the residual method to recognize revenue from software arrangements that include one or more elements to be delivered at a future date when evidence of the fair value of all undelivered elements exists, and the elements of the arrangement qualify for separate accounting as described above. Under the residual method, the fair value of the undelivered elements (i.e., support and services) based on VSOE is deferred and the remaining portion of the total arrangement fee is allocated to the delivered elements (i.e., software license). If evidence of the fair value of one or more of the undelivered elements does not exist, all revenues are deferred and recognized when delivery of all of those elements has occurred or when fair values can be established. We determine VSOE of the fair value of services and support revenue based upon our recent pricing for those elements when sold separately. For certain transactions, VSOE of the fair value of support revenue is determined based on a substantive support renewal clause within a customer contract. Our current pricing practices are influenced primarily by product type, purchase volume, sales channel and customer location. We review services and support sold separately on a periodic basis and update, when appropriate, our VSOE of fair value for such services to ensure that it reflects our recent pricing experience.
	Generally, our contracts are accounted for individually. However, when contracts are closely interrelated and dependent on each other, it may be necessary to account for two or more contracts as one to reflect the substance of the group of contracts.
	For subscription-based licenses, license revenue is recognized ratably over the term of the arrangement. In limited circumstances, where the right to use the software license is contingent upon current payments of support, fees for software license and support are recognized ratably over the initial support term.
	Support contracts generally include rights to unspecified upgrades (when and if available), telephone and internet-based support, updates and bug fixes. support revenue is recognized ratably over the term of the support contract on a straight-line basis.
	Reimbursements of out-of-pocket expenditures incurred in connection with providing consulting services are included in services revenue, with the offsetting expense recorded in cost of service revenue.
	Training services include on-site and classroom training. Training revenues are recognized as the related training services are provided.
Deferred Revenue	'
	Deferred Revenue
	Deferred revenue primarily relates to software support agreements billed to customers for which the services have not yet been provided. The liability associated with performing these services is included in deferred revenue and, if not yet paid, the related amount is included in other current assets. Billed but uncollected support-related amounts included in other current assets at September 30, 2013 and 2012 were $108.6 million and $110.7 million, respectively. Deferred revenue consisted of the following:
		September 30,
		2013		2012
		(in thousands)
	Deferred support revenue	$	312,721	$	306,940
	Deferred service revenue	18,793		14,127
	Deferred license revenue	5,399		6,462
	Total deferred revenue	$	336,913	$	327,529
Cash, Cash Equivalents	'
	Cash, Cash Equivalents
	Our cash equivalents are invested in money market accounts and time deposits of financial institutions. We have established guidelines relative to credit ratings, diversification and maturities that are intended to maintain safety and liquidity. Cash equivalents include highly liquid investments with maturity periods of three months or less when purchased.
Concentration Of Credit Risk And Fair Value Of Financial Instruments	'
	Concentration of Credit Risk and Fair Value of Financial Instruments
	The amounts reflected in the consolidated balance sheets for cash and cash equivalents, accounts receivable and accounts payable approximate their fair value due to their short maturities. Financial instruments that potentially subject us to concentration of credit risk consist primarily of investments, trade accounts receivable and foreign currency derivative instruments. Our cash, cash equivalents, and foreign currency derivatives are placed with financial institutions with high credit standings. Our credit risk for derivatives is also mitigated due to the short-term nature of the contracts. Our customer base consists of large numbers of geographically diverse customers dispersed across many industries, and no individual customer comprised more than 10% of our trade accounts receivable as of September 30, 2013 or 2012.
Fair Value Measurements	'
	Fair Value Measurements
	Fair value is defined as the price that would be received from selling an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. 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. Accounting standards prescribe a fair value hierarchy that requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. A financial instrument’s categorization within the fair value hierarchy is based upon the lowest level of input that is significant to the fair value measurement. Three levels of inputs that may be used to measure fair value:
	•	Level 1: quoted prices (unadjusted) in active markets for identical assets or liabilities;
	•	Level 2: inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices in active markets for similar assets or liabilities, quoted prices for identical or similar assets or liabilities in markets that are not active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities; or
	•	Level 3: unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.
	Our significant financial assets and liabilities measured at fair value on a recurring basis as of September 30, 2013 and 2012 were as follows:
		September 30,
		2013		2012
		(in thousands)
	Financial assets
	Cash equivalents—Level 1 (1)	$	56,706	$	231,488
	Forward contracts—Level 2	301		236
		$	57,007	$	231,724
	Financial liabilities
	Forward contracts—Level 2	$	438	$	—
	(1) Money market funds and time deposits.
Allowance For Doubtful Accounts	'
	Allowance for Doubtful Accounts
	We maintain allowances for doubtful accounts for estimated losses resulting from the inability of our customers to make required payments. In determining the adequacy of the allowance for doubtful accounts, management specifically analyzes individual accounts receivable, historical bad debts, customer concentrations, customer credit-worthiness, current economic conditions, and accounts receivable aging trends. Our allowance for doubtful accounts on trade accounts receivable was $3.0 million as of September 30, 2013, $3.4 million as of September 30, 2012, $3.9 million as of September 30, 2011 and $4.6 million as of September 30, 2010. Uncollectible trade accounts receivable written-off, net of recoveries, were $0.6 million, $0.8 million and $0.8 million in 2013, 2012 and 2011, respectively. Provisions for bad debt expense were $0.2 million, $0.3 million and $0.1 million in 2013, 2012 and 2011, respectively, and are included in general and administrative expenses in the accompanying consolidated statements of operations.
Financing Receivables And Transfers Of Financial Assets	'
	Financing Receivables and Transfers of Financial Assets
	We periodically provide extended payment terms for software purchases to credit-worthy customers with payment terms up to 24 months. The determination of whether to offer such payment terms is based on the size, nature and credit-worthiness of the customer, and the history of collecting amounts due, without concession, from the customer and customers generally. This determination is based on an internal credit assessment. In making this assessment, we use the Standard & Poor's (S&P) credit rating as our primary credit quality indicator, if available. If a customer, including both commercial and U.S. Federal government, has a S&P bond rating of BBB- or above, we designate the customer as a Tier 1. If a customer does not have a S&P bond rating, or has a S&P bond rating below BBB-, we base our assessment on an internal credit assessment which considers selected balance sheet, operating and liquidity measures, historical payment experience, and current business conditions within the industry or region. We designate these customers as Tier 2 or Tier 3, with Tier 3 being lower credit quality than Tier 2.
	As of September 30, 2013 and 2012, amounts due from customers for contracts with original payment terms greater than twelve months (financing receivables) totaled $53.1 million and $42.5 million, respectively. Accounts receivable and other current assets in the accompanying consolidated balance sheets include current receivables from such contracts totaling $36.1 million and $29.5 million at September 30, 2013 and 2012, respectively, and other assets in the accompanying consolidated balance sheets include long-term receivables from such contracts totaling $17.0 million and $13.0 million at September 30, 2013 and 2012, respectively. As of September 30, 2013 and September 30, 2012, respectively, none of these receivables were past due. Our credit risk assessment for financing receivables was as follows:
		September 30,
		2013		2012
		(in thousands)
	S&P bond rating BBB-1 and above-Tier 1	$	42,189	$	34,017
	Internal Credit Assessment-Tier 2	10,934		8,446
	Internal Credit Assessment-Tier 3	—		—
	Total financing receivables	$	53,123	$	42,463
	We evaluate the need for an allowance for doubtful accounts for estimated losses resulting from the inability of these customers to make required payments. We write off uncollectible trade and financing receivables when we have exhausted all collection avenues. As of September 30, 2013 and 2012, we concluded that all financing receivables were collectible and no reserve for credit losses was recorded. We did not provide a reserve for credit losses or write off any uncollectible financing receivables in 2013, 2012 and 2011.
	We periodically transfer future payments under certain of these contracts to third-party financial institutions on a non-recourse basis. We record such transfers as sales of the related accounts receivable when we surrender control of such receivables. In 2013, 2012 and 2011, we sold $17.0 million, $14.3 million and $4.1 million, respectively, of financing receivables to third-party financial institutions.
Derivatives	'
	Derivatives
	Generally accepted accounting principles require all derivatives, whether designated in a hedging relationship or not, to be recorded on the balance sheet at fair value. Changes in the derivative’s fair value are recognized currently in earnings unless specific hedge accounting criteria are met.
	Derivatives are financial instruments whose values are derived from one or more underlying financial instruments, such as foreign currency. We enter into derivative transactions, specifically foreign currency forward contracts, to manage our exposure to fluctuations in foreign exchange rates that arise primarily from our foreign currency-denominated receivables and payables. The contracts are primarily denominated in European currencies, typically have maturities of less than three months and require an exchange of foreign currencies for U.S. dollars at maturity of the contracts at rates agreed to at inception of the contracts. We do not enter into or hold derivatives for trading or speculative purposes. Generally, we do not designate foreign currency forward contracts as hedges for accounting purposes, and changes in the fair value of these instruments are recognized immediately in earnings. Because we enter into forward contracts only as an economic hedge, any gain or loss on the underlying foreign-denominated balance would be offset by the loss or gain on the forward contract. Gains and losses on forward contracts and foreign denominated receivables and payables are included in foreign currency net losses.
	As of September 30, 2013 and 2012, we had outstanding forward contracts with notional amounts equivalent to the following:
		September 30,
	Currency Hedged	2013		2012
		(in thousands)
	Canadian/U.S. Dollar	$	41,852	$	54,133
	Euro/U.S. Dollar	50,902		53,716
	Chinese Renminbi/U.S. Dollar	—		3,666
	Japanese Yen/U.S. Dollar	6,496		13,415
	Swiss Franc/U.S. Dollar	9,678		—
	All other	15,506		8,973
	Total	$	124,434	$	133,903
	The accompanying consolidated balance sheets include net assets of $0.3 million and $0.2 million in other current assets as of September 30, 2013 and September 30, 2012, respectively, and a net liability of $0.4 million in accrued expenses and other current liabilities as of September 30, 2013 related to the fair value of our forward contracts.
	Net gains and losses on foreign currency exposures, including realized and unrealized gains and losses on forward contracts, included in foreign currency net losses, were net losses of $2.0 million, $5.9 million and $12.3 million for 2013, 2012 and 2011, respectively. Excluding the underlying foreign currency exposure being hedged, net realized and unrealized gains and losses on forward contracts included in foreign currency net losses, were a net gain of $3.4 million in 2013, and net losses of $3.6 million and $4.1 million in 2012 and 2011, respectively.
	In 2011, in connection with our planned acquisition of MKS, we entered into forward contracts to purchase CND$292 million (equivalent to approximately $305 million when we entered into the contracts) to reduce our foreign currency exposure related to changes in the Canadian to U.S. Dollar exchange rate from the time we entered into the agreement to acquire MKS (the purchase price was in Canadian Dollars) and the expected closing date. In 2011, we settled these contracts and recorded a net foreign currency loss of $4.4 million.
Property And Equipment	'
	Property and Equipment
	Property and equipment are recorded at cost and depreciated using the straight-line method over their estimated useful lives. Computer hardware and software are typically amortized over three to five years, and furniture and fixtures over three to eight years. Leasehold improvements are amortized over the shorter of their useful lives or the remaining terms of the related leases. Property and equipment under capital leases are amortized over the lesser of the lease terms or their estimated useful lives. Maintenance and repairs are charged to expense when incurred; additions and improvements are capitalized. When an item is sold or retired, the cost and related accumulated depreciation is relieved, and the resulting gain or loss, if any, is recognized in income.
Software Development Costs	'
	Software Development Costs
	We incur costs to develop computer software to be licensed or otherwise marketed to customers. Research and development costs are expensed as incurred, except for costs of internally developed or externally purchased software that qualify for capitalization. Development costs for software to be sold externally incurred subsequent to the establishment of technological feasibility, but prior to the general release of the product, are capitalized and, upon general release, are amortized using the greater of either the straight-line method over the expected life of the related products or based upon the pattern in which economic benefits related to such assets are realized. The straight-line method is used if it approximates the same amount of expense as that calculated using the ratio that current period gross product revenues bear to total anticipated gross product revenues. No development costs for software to be sold externally were capitalized in 2013, 2012 or 2011. In connection with acquisitions of businesses described in Note E, we capitalized software of $54.0 million and $44.9 million in 2013 and 2011, respectively. These assets are included in acquired intangible assets in the accompanying consolidated balance sheets.
Goodwill, Acquired Intangible Assets And Long-lived Assets	'
	Goodwill, Acquired Intangible Assets and Long-lived Assets
	Goodwill is the amount by which the purchase price in a business acquisition exceeds the fair values of net identifiable assets on the date of purchase.
	Goodwill is evaluated for impairment annually, or more frequently if events or changes in circumstances indicate that the asset might be impaired. Factors we consider important, on an overall company basis and reportable-segment basis, when applicable, that could trigger an impairment review include significant underperformance relative to historical or projected future operating results, significant changes in our use of the acquired assets or the strategy for our overall business, significant negative industry or economic trends, a significant decline in our stock price for a sustained period and a reduction of our market capitalization relative to net book value. We perform our annual goodwill assessment as of the end of the third quarter. Our goodwill impairment assessment was based on the guidance prescribed in ASU 2011-8. On July 2, 2011, the estimated fair value of each reporting unit was approximately double its carrying value or higher. Because our fair value was well in excess of our carrying value on that date, and there were no other indicators that our goodwill had become impaired since that date, we elected to perform a qualitative assessment to test each reporting unit’s goodwill for impairment. Based on our qualitative assessment, if we determine that the fair value of a reporting unit is more likely than not (i.e., a likelihood of more than 50 percent) to be greater than its carrying amount no additional testing will be performed. If we determine that the fair value of a reporting unit is more likely than not to be less than its carrying amount, the two step impairment test will be performed. In the first step, we compare the fair value of each reporting unit to its carrying value. If the fair value of the reporting unit exceeds the carrying value of the net assets assigned to that unit, goodwill is not considered impaired and we are not required to perform further testing. If the carrying value of the net assets assigned to the reporting unit exceeds the fair value of the reporting unit, then we must perform the second step of the impairment test in order to determine the implied fair value of the reporting unit’s goodwill. If the carrying value of a reporting unit’s goodwill exceeds its implied fair value, then we would record an impairment loss equal to the difference.
	Long-lived assets primarily include property and equipment and acquired intangible assets with finite lives (including purchased software, customer lists and trademarks). Purchased software is amortized over 3 to 10 years, customer lists are amortized over 4 to 12 years and trademarks are amortized over 3 to 7 years. We review long-lived assets for impairment when events or changes in business circumstances indicate that the carrying amount of the assets may not be fully recoverable or that the useful lives of those assets are no longer appropriate. Each impairment test is based on a comparison of the undiscounted cash flows to the recorded value of the asset. If impairment is indicated, the asset is written down to its estimated fair value based on a discounted cash flow analysis.
Advertising Expenses	'
	Advertising Expenses
	Advertising costs are expensed as incurred. Total advertising expenses incurred were $4.2 million, $2.8 million and $2.6 million in 2013, 2012 and 2011, respectively.
Income Taxes	'
	Income Taxes
	Our income tax expense includes U.S. and international income taxes. Certain items of income and expense are not reported in tax returns and financial statements in the same year. The tax effects of these differences are reported as deferred tax assets and liabilities. Deferred tax assets are recognized for the estimated future tax effects of deductible temporary differences and tax operating loss and credit carryforwards. Changes in deferred tax assets and liabilities are recorded in the provision for income taxes. We assess the likelihood that our deferred tax assets will be recovered from future taxable income and, to the extent we believe that it is more likely than not that all or a portion of deferred tax assets will not be realized, we establish a valuation allowance. To the extent we establish a valuation allowance or increase this allowance in a period, we include an expense within the tax provision in the consolidated statement of operations.
Comprehensive Income	'
	Comprehensive Income (Loss)
	Comprehensive income (loss) consists of net income (loss) and other comprehensive income (loss), which includes foreign currency translation adjustments and changes in unrecognized actuarial gains and losses (net of tax) related to pension benefits. For the purposes of comprehensive income disclosures, we do not record tax provisions or benefits for the net changes in the foreign currency translation adjustment, as we intend to reinvest permanently undistributed earnings of our foreign subsidiaries. Accumulated other comprehensive loss is reported as a component of stockholders’ equity and, as of September 30, 2013 and 2012, was comprised of cumulative translation adjustment losses of $0.4 million and $7.6 million, respectively, and unrecognized actuarial losses related to pension benefits of $74.4 million ($50.8 million net of tax) and $96.4 million ($64.9 million net of tax), respectively.
Earnings Per Share (EPS)	'
	Earnings per Share (EPS)
	Basic EPS is calculated by dividing net income by the weighted average number of shares outstanding during the period. Unvested restricted shares, although legally issued and outstanding, are not considered outstanding for purposes of calculating basic earnings per share. Diluted EPS is calculated by dividing net income by the weighted average number of shares outstanding plus the dilutive effect, if any, of outstanding stock options, restricted shares and restricted stock units using the treasury stock method. The calculation of the dilutive effect of outstanding equity awards under the treasury stock method includes consideration of proceeds from the assumed exercise of stock options, unrecognized compensation expense and any tax benefits as additional proceeds.
	The following table presents the calculation for both basic and diluted EPS:
		Year ended September 30,
		2013		2012			2011
		(in thousands, except per share data)
	Net income (loss)	$	143,769	$	(35,398	)	$	85,424
	Weighted average shares outstanding	119,473		118,705			117,579
	Dilutive effect of employee stock options, restricted shares and restricted stock units	1,767		—			3,395
	Diluted weighted average shares outstanding	121,240		118,705			120,974
	Basic earnings (loss) per share	$	1.2	$	(0.30	)	$	0.73
	Diluted earnings (loss) per share	$	1.19	$	(0.30	)	$	0.71
	Due to the net loss generated in 2012, the dilutive effect of stock options, restricted shares and restricted stock units totaling 2.3 million was excluded from the computation of diluted EPS for that period as the effect would have been anti-dilutive. In 2011, stock options to purchase 0.2 million shares were excluded from the computation of diluted EPS as their effect would have been anti-dilutive.
Stock-Based Compensation	'
	Stock-Based Compensation
	We measure the compensation cost of employee services received in exchange for an award of equity instruments based on the grant-date fair value of the award. That cost is recognized over the period during which an employee is required to provide service in exchange for the award. See Note K for a description of the types of stock-based awards granted, the compensation expense related to such awards and detail of equity-based awards outstanding. See Note G for detail of the tax benefit recognized in the consolidated statement of operations related to stock-based compensation.

Summary_Of_Significant_Account2

Summary Of Significant Accounting Policies (Tables)	12 Months Ended
	Sep. 30, 2013
Accounting Policies [Abstract]	'
Revenue Recognition	'
	We derive revenues from three primary sources: (1) software licenses, (2) services, and (3) support.
Deferred Revenue	'
	Deferred revenue consisted of the following:
		September 30,
		2013		2012
		(in thousands)
	Deferred support revenue	$	312,721	$	306,940
	Deferred service revenue	18,793		14,127
	Deferred license revenue	5,399		6,462
	Total deferred revenue	$	336,913	$	327,529
Financial Assets And Liabilities Measured At Fair Value On Recurring Basis	'
	Our significant financial assets and liabilities measured at fair value on a recurring basis as of September 30, 2013 and 2012 were as follows:
		September 30,
		2013		2012
		(in thousands)
	Financial assets
	Cash equivalents—Level 1 (1)	$	56,706	$	231,488
	Forward contracts—Level 2	301		236
		$	57,007	$	231,724
	Financial liabilities
	Forward contracts—Level 2	$	438	$	—
	(1) Money market funds and time deposits.
Financing Receivable Credit Quality Indicators	'
	As of September 30, 2013 and September 30, 2012, respectively, none of these receivables were past due. Our credit risk assessment for financing receivables was as follows:
		September 30,
		2013		2012
		(in thousands)
	S&P bond rating BBB-1 and above-Tier 1	$	42,189	$	34,017
	Internal Credit Assessment-Tier 2	10,934		8,446
	Internal Credit Assessment-Tier 3	—		—
	Total financing receivables	$	53,123	$	42,463
Notional Amounts Of Outstanding Forward Contracts	'
	As of September 30, 2013 and 2012, we had outstanding forward contracts with notional amounts equivalent to the following:
		September 30,
	Currency Hedged	2013		2012
		(in thousands)
	Canadian/U.S. Dollar	$	41,852	$	54,133
	Euro/U.S. Dollar	50,902		53,716
	Chinese Renminbi/U.S. Dollar	—		3,666
	Japanese Yen/U.S. Dollar	6,496		13,415
	Swiss Franc/U.S. Dollar	9,678		—
	All other	15,506		8,973
	Total	$	124,434	$	133,903
Earnings Per Share Basic And Diluted	'
	The following table presents the calculation for both basic and diluted EPS:
		Year ended September 30,
		2013		2012			2011
		(in thousands, except per share data)
	Net income (loss)	$	143,769	$	(35,398	)	$	85,424
	Weighted average shares outstanding	119,473		118,705			117,579
	Dilutive effect of employee stock options, restricted shares and restricted stock units	1,767		—			3,395
	Diluted weighted average shares outstanding	121,240		118,705			120,974
	Basic earnings (loss) per share	$	1.2	$	(0.30	)	$	0.73
	Diluted earnings (loss) per share	$	1.19	$	(0.30	)	$	0.71

Restructuring_Charges_Tables

Restructuring Charges (Tables)	12 Months Ended
	Sep. 30, 2013
Restructuring [Abstract]	'
Schedule of Restructuring Reserve by Type of Cost [Table Text Block]	'
	The following table summarizes restructuring charges reserve activity for the three years ended September 30, 2013:
					For the year ended September 30, 2013
					2013 Restructuring Charges
		Prior Period Restructuring Charges			Employee Severance			Facility Closures			Consolidated Total
					and Related Benefits			and Other Costs
		(in thousands)
	Balance, October 1, 2010	$	1,165		$	—		$	—		$	1,165
	Cash disbursements	(502		)	—			—			(502		)
	Foreign currency impact	3			—			—			3
	Balance, September 30, 2011	666			—			—			666
	Charges to operations	24,928									24,928
	Cash disbursements	(20,947		)	—			—			(20,947		)
	Foreign currency impact	(186		)	—			—			(186		)
	Balance, September 30, 2012	4,461			—			—			4,461
	Charges to operations	(251		)	50,954			1,494			52,197
	Cash disbursements	(4,225		)	(31,781		)	(1,193		)	(37,199		)
	Foreign currency impact	15			60			(5		)	70
	Balance, September 30, 2013	$	—		$	19,233		$	296		$	19,529

Property_And_Equipment_Tables

Property And Equipment (Tables)	12 Months Ended
	Sep. 30, 2013
Property, Plant and Equipment [Abstract]	'
Components Of Property And Equipment	'
	Property and equipment consisted of the following:
		September 30,
		2013			2012
		(in thousands)
	Computer hardware and software	$	217,724		$	224,558
	Furniture and fixtures	19,211			20,878
	Leasehold improvements	35,289			46,393
	Gross property and equipment	272,224			291,829
	Accumulated depreciation and amortization	(207,572		)	(228,363		)
	Net property and equipment	$	64,652		$	63,466

Acquisitions_Tables

Acquisitions (Tables)	12 Months Ended
	Sep. 30, 2013
Business Combinations [Abstract]	'
Pro Forma Financial Information	'
	Unaudited Pro Forma Financial Information
		Year ended
		30-Sep-11
		(in millions, except per share amounts)
	Revenue	$	1,227.80
	Net income	$	93
	Earnings per share—Basic	$	0.79
	Earnings per share—Diluted	$	0.77

Recovered_Sheet1

Goodwill and Acquired Intangible Assets (Tables)	12 Months Ended
	Sep. 30, 2013
Goodwill and Intangible Assets Disclosure [Abstract]	'
Goodwill And Acquired Intangible Assets	'
	Goodwill and acquired intangible assets consisted of the following:
		30-Sep-13									30-Sep-12
		Gross			Accumulated			Net Book			Gross		Accumulated		Net Book
		Carrying			Amortization			Value			Carrying		Amortization		Value
		Amount									Amount
		(in thousands)
	Goodwill (not amortized)							$	769,095						$	610,347
	Intangible assets with finite lives (amortized) (1):
	Purchased software	$	233,566		$	148,127		$	85,439		$	177,166	$	127,250	$	49,916
	Capitalized software	22,877			22,877			—			22,877		22,877		—
	Customer lists and relationships	304,434			120,338			184,096			227,097		93,215		133,882
	Trademarks and trade names	13,427			10,097			3,330			11,013		8,967		2,046
	Other	3,784			3,528			256			3,437		3,396		41
		$	578,088		$	304,967		$	273,121		$	441,590	$	255,705	$	185,885
	Total goodwill and acquired intangible assets							$	1,042,216						$	796,232
	(1)    The weighted average useful lives of purchased software, customer lists and relationships, trademarks and trade names and other intangible assets with a remaining net book value are 8 years, 10 years, 7 years and 3 years, respectively.
Schedule Of Movements in Goodwill by Reportable Segment	'
	Changes in goodwill presented by reportable segment were as follows:
		Software			Services			Total
		Products			Segment
		Segment
		(in thousands)
	Balance, October 1, 2012	$	588,443		$	24,951		$	613,394
	Acquisition of 4CS	(950		)	—			(950		)
	Foreign currency translation adjustments	(2,024		)	(73		)	(2,097		)
	Balance, September 30, 2012	585,469			24,878			610,347
	Acquisition of Servigistics	127,033			12,800			139,833
	Acquisition of NetIDEAS	—			10,196			10,196
	Acquisition of Enigma	3,570			581			4,151
	Foreign currency translation and other adjustments	4,476			92			4,568
	Balance, September 30, 2013	$	720,548		$	48,547		$	769,095
Amortization Of Intangible Assets	'
	The aggregate amortization expense for intangible assets with finite lives recorded for the years ended September 30, 2013, 2012 and 2011 was reflected in our consolidated statements of operations as follows:
		Year ended September 30,
		2013			2012			2011
		(in thousands)
	Amortization of acquired intangible assets	$	26,486		$	20,303		$	18,319
	Cost of license revenue	18,586			15,819			15,393
	Total amortization expense	$	45,072		$	36,122		$	33,712

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Sep. 30, 2012
Income Tax Disclosure [Abstract]	'
Summary Of Income (Loss) Before Income Taxes	'
	Our income (loss) before income taxes consisted of the following:
		Year ended September 30,
		2013				2012				2011
		(in thousands)
	Domestic	$	6,112			$	(11,422	)		$	(23,984	)
	Foreign	120,122				132,158				128,532
	Total income before income taxes	$	126,234			$	120,736			$	104,548
Schedule Of Provision For (Benefit From) Income Taxes	'
	Our (benefit) provision for income taxes consisted of the following:
		Year ended September 30,
		2013				2012				2011
		(in thousands)
	Current:
	Federal	$	7,081			$	8,534			$	22,849
	State	1,512				1,733				(192		)
	Foreign	13,586				41,101				31,530
		22,179				51,368				54,187
	Deferred:
	Federal	(38,224		)		106,041				(31,303		)
	State	(4,718		)		7,706				(2,176		)
	Foreign	3,228				(8,981		)		(1,584		)
		(39,714		)		104,766				(35,063		)
	Total (benefit) provision for income taxes	$	(17,535	)		$	156,134			$	19,124
Summary Of Federal Income Tax Rate And Effective Income Tax Rate	'
	The reconciliation between the statutory federal income tax rate and our effective income tax rate is shown below:
		Year ended September 30,
		2013			2012			2011
	Statutory federal income tax rate	35	%		35	%		35	%
	Change in valuation allowance	(32	)%		103	%		3	%
	State income taxes, net of federal tax benefit	1	%		—	%		(2	)%
	Federal and state research and development credits	(1	)%		(1	)%		(5	)%
	Tax audit and examination settlements	(1	)%		1	%		—	%
	Foreign rate differences	(26	)%		(16	)%		(15	)%
	Foreign withholding tax	5	%		3	%		—	%
	Subsidiary reorganization	—	%		3	%		1	%
	Other, net	5	%		1	%		1	%
	Effective income tax rate	(14	)%		129	%		18	%
Schedule Of Deferred Tax Assets And Liabilities	'
	The significant temporary differences that created deferred tax assets and liabilities are shown below:
		September 30,
		2013				2012
		(in thousands)
	Deferred tax assets:
	Net operating loss carryforwards	$	47,770			$	23,879
	Foreign tax credits	5,994				—
	Capitalized research and development expense	51,237				59,562
	Pension benefits	30,870				35,676
	Deferred revenue	63,976				58,791
	Stock-based compensation	18,045				17,137
	Accrual for litigation	—				16,310
	Other reserves not currently deductible	19,343				12,058
	Amortization of intangible assets	5,772				10,658
	Other tax credits	31,263				23,899
	Depreciation	3,077				5,582
	Other	4,396				5,984
	Gross deferred tax assets	281,743				269,536
	Valuation allowance	(156,547		)		(170,404		)
	Total deferred tax assets	125,196				99,132
	Deferred tax liabilities:
	Acquired intangible assets not deductible	(88,134		)		(53,030		)
	Pension prepayments	(15,607		)		(12,475		)
	Deferred revenue	(12,592		)		(21,693		)
	Other	(4,463		)		(651		)
	Total deferred tax liabilities	(120,796		)		(87,849		)
	Net deferred tax assets	$	4,400			$	11,283
Summary Of Valuation Allowance	'
	The changes to the valuation allowance were primarily due to:
		Year ended September 30,
		2013				2012				2011
		(in millions)
	Valuation allowance beginning of year	$	170.4			$	38.6			$	40.5
	Net release of valuation allowance (1)	(44.6		)		—				(2.4		)
	Establish valuation allowance in the U.S.	—				124.5				—
	Net increase/decrease in deferred tax assets for foreign jurisdictions with a full valuation allowance	1.9				(2.1		)		(0.8		)
	Establish valuation allowance for acquired businesses	12.1				—				—
	Establish valuation allowance in foreign jurisdictions	—				0.6				—
	Adjust deferred tax asset and valuation allowance in the U.S.	16.7				8.8				1.3
	Valuation allowance end of year	156.5				170.4				$	38.6
	-1	In 2013, this is attributable to recognition of deferred tax liabilities recorded in connection with accounting for 2013 acquisitions and a reduction in deferred tax assets associated with our U.S. pension plan, both of which are described above.
Schedule Of Unrecognized Tax Benefit	'
		Year ended September 30,
	Unrecognized tax benefits	2013				2012				2011
		(in millions)
	Unrecognized tax benefit beginning of year	$	19.1			$	16.2			$	15.9
	Tax positions related to current year:
	Additions	1				3.4				1.1
	Tax positions related to prior years:
	Additions	1.8				1.4				0.7
	Reductions	(6.3		)		(0.5		)		(1.5		)
	Settlements	(0.7		)		—				—
	Statute expirations	(1.2		)		(1.4		)		—
	Unrecognized tax benefit end of year	$	13.7			$	19.1			$	16.2
Summary Of Income Tax Examinations Years	'
	As of September 30, 2013, we remained subject to examination in the following major tax jurisdictions for the tax years indicated:
	Major Tax Jurisdiction		Open Years
	United States		2010 through 2013
	Germany		2011 through 2013
	France		2010 through 2013
	Japan		2008 through 2013
	Ireland		2009 through 2013

Commitments_And_Contingencies_

Commitments And Contingencies (Tables)	12 Months Ended
	Sep. 30, 2012
Commitments and Contingencies Disclosure [Abstract]	'
Future Minimum Lease Payments	'
	At September 30, 2013, our future minimum lease payments under noncancellable operating leases are as follows:
	Year ending September 30,	(in thousands)
	2014	$	40,870
	2015	35,580
	2016	28,165
	2017	22,463
	2018	18,972
	Thereafter	52,762
	Total minimum lease payments	$	198,812

Equity_Incentive_Plan_Tables

Equity Incentive Plan (Tables)	12 Months Ended
	Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Total Stock Based Compensation Expense	'
	The following table shows total stock-based compensation expense recorded from our stock-based awards as reflected in our consolidated statements of operations:
		Year ended September 30,
		2013			2012			2011
		(in thousands)
	Cost of license revenue	$	21		$	22		$	15
	Cost of service revenue	6,134			5,682			5,011
	Cost of support revenue	3,324			3,234			2,721
	Sales and marketing	11,326			13,809			11,428
	Research and development	8,590			8,761			8,547
	General and administrative	19,392			19,797			17,680
	Total stock-based compensation expense	$	48,787		$	51,305		$	45,402
Restricted Stock And Restricted Stock Unit Grants	'
			Restricted Stock Units
	Restricted stock unit grants		Performance-based (1)		Time-based (2)
			(Number of Units in thousands)
	Year ended September 30, 2013		422		2,232
	-1	Of these performance-based RSUs, the performance conditions were achieved for approximately 200 thousand shares, half of which vested in November 2013, with the remainder to vest in two substantially equal installments in November 2014 and 2015. The remaining approximately 200 thousand shares will be eligible to vest in two substantially equal installments on the later of November 15, 2014 and November 15, 2015 and the date the Compensation Committee determines the extent to which performance criteria have been achieved. RSUs not earned for earlier periods are eligible to be earned in 2014 or 2015.
	-2	The time-based RSUs were issued to directors and employees, including some of our executive officers. The time-based RSUs issued to employees and executives will vest in three substantially equal annual installments from the date of grant. Substantially all of the time-based RSUs issued to our directors will vest one year from the date of grant.
Stock Option Activity	'
		Shares		Weighted			Weighted Average		Aggregate
				Average			Remaining		Intrinsic
				Exercise			Contractual Term		Value
				Price
	Stock option activity for the year ended September 30, 2013	(in thousands)					(in years)		(in thousands)
	Outstanding:
	Balance, October 1, 2012	573		$	10.36
	Cancelled	(7	)	$	7.56
	Exercised	(467	)	$	10.45
	Balance, September 30, 2013	99		$	10.13		0.82		$	1,817
	Exercisable September 30, 2013	99		$	10.13		0.82		$	1,814
Value Of Stock Option And Stock-Based Award Activity	'
		Year ended September 30,
		2013			2012			2011
	Value of stock option and stock-based award activity	(in thousands)
	Total intrinsic value of stock options exercised	$	6,525		$	31,746		$	15,983
	Total fair value of restricted stock and restricted stock unit awards vested	$	48,083		$	65,574		$	68,772
Restricted Stock [Member]	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Restricted Stock Activity	'
		Shares		Weighted			Aggregate Intrinsic Value as of September 30, 2013
				Average
				Grant Date
				Fair Value
	Restricted stock activity for the year ended September 30, 2013	(in thousands except grant date fair value data)
	Balance of nonvested outstanding restricted stock October 1, 2012	72		$	24.49
	Vested	(67	)	$	24.72
	Balance of nonvested outstanding restricted stock September 30, 2013	5		$	21.27		$	134
Restricted Stock Units [Member]	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Restricted Stock Activity	'
		Shares		Weighted			Aggregate Intrinsic Value as of September 30, 2013
				Average
				Grant Date
				Fair Value
	Restricted stock unit activity for the year ended September 30, 2013	(in thousands except grant date fair value data)
	Balance of nonvested outstanding restricted stock units October 1, 2012	5,134		$	19.99
	Granted	2,654		$	22.87
	Vested	(2,188	)	$	19.26
	Forfeited or not earned	(414	)	$	21.26
	Balance of nonvested outstanding restricted stock units September 30, 2013	5,186		$	21.67		$	147,684

Pension_Plans_Tables

Pension Plans (Tables)	12 Months Ended
	Sep. 30, 2012
Schedule of Available-for-sale Securities [Line Items]	'
Accounting For The Pension Plans	'
	The following table presents the actuarial assumptions used in accounting for the pension plans:
		U.S. Plan									International Plans
		2013			2012			2011			2013		2012			2011
	Weighted average assumptions used to determine benefit obligations at September 30 measurement date:
	Discount rate	4.9	%		4	%		4.5	%		3.3	%	3.4	%		4.8	%
	Rate of increase in future compensation (1)	—	%		—	%		—	%		3	%	3	%		3	%
	Weighted average assumptions used to determine net periodic pension cost for fiscal years ended September 30:
	Discount rate	4	%		4.5	%		5	%		3.4	%	4.8	%		4	%
	Rate of increase in future compensation	—	%		—	%		—	%		3	%	3	%		2.7	%
	Rate of return on plan assets	7.25	%		7.25	%		7.25	%		5.4	%	5.4	%		5.6	%
	-1	The rate of increase in future compensation is weighted for all plans, ongoing and frozen (with a 0% increase for frozen plans). The weighted rate of increase for ongoing non-U.S. plans was 3% at September 30, 2013 and 2012.
Components Of Net Periodic Pension Cost	'
	The actuarially computed components of net periodic pension cost recognized in our consolidated statements of operations for each year are shown below:
		U.S. Plan											International Plans
		2013				2012				2011			2013				2012			2011
		(in thousands)
	Interest cost of projected benefit obligation	$	4,989			$	5,490			$	5,627		$	2,384			$	2,554		$	2,382
	Service cost	—				—				—			2,017				1,882			1,782
	Expected return on plan assets	(6,128		)		(5,412		)		(5,373		)	(2,126		)		(1,929		)	(2,254		)
	Amortization of prior service cost	—				—				—			(6		)		(7		)	—
	Recognized actuarial loss	3,152				2,967				2,549			1,248				341			334
	Net periodic pension cost	$	2,013			$	3,045			$	2,803		$	3,517			$	2,841		$	2,244
Change In Benefit Obligation And Plan Assets	'
	The following tables display the change in benefit obligation and the change in the plan assets and funded status of the plans as well as the amounts recognized in our consolidated balance sheets:
		U.S. Plan								International Plans							Total
		Year ended September 30,
		2013				2012				2013			2012				2013			2012
		(in thousands)
	Change in benefit obligation:
	Projected benefit obligation—beginning of year	$	129,701			$	123,645			$	71,408		$	55,382			$	201,109		$	179,027
	Service cost	—				—				2,017			1,882				2,017			1,882
	Interest cost	4,989				5,490				2,384			2,554				7,373			8,044
	Actuarial (gain) loss	(12,728		)		8,449				1,426			14,724				(11,302		)	23,173
	Foreign exchange impact	—				—				629			(2,132		)		629			(2,132		)
	Participant contributions	—				—				432			421				432			421
	Benefits paid	(8,584		)		(7,883		)		(1,732		)	(1,423		)		(10,316		)	(9,306		)
	Plan curtailments	—				—				(1,608		)	—				(1,608		)	—
	Projected benefit obligation—end of year	$	113,378			$	129,701			$	74,956		$	71,408			$	188,334		$	201,109
	Change in plan assets and funded status:
	Plan assets at fair value—beginning of year	$	86,016			$	74,367			$	38,817		$	36,414			$	124,833		$	110,781
	Actual return on plan assets	10,438				13,995				3,172			2,504				13,610			16,499
	Employer contributions	6,961				5,537				3,008			2,129				9,969			7,666
	Participant contributions	—				—				432			421				432			421
	Foreign exchange impact	—				—				(335		)	(1,228		)		(335		)	(1,228		)
	Benefits paid	(8,584		)		(7,883		)		(1,732		)	(1,423		)		(10,316		)	(9,306		)
	Plan assets at fair value—end of year	94,831				86,016				43,362			38,817				138,193			124,833
	Projected benefit obligation—end of year	113,378				129,701				74,956			71,408				188,334			201,109
	Underfunded status	$	(18,547	)		$	(43,685	)		$	(31,594	)	$	(32,591	)		$	(50,141	)	$	(76,276	)
	Accumulated benefit obligation—end of year	$	113,378			$	129,701			$	71,513		$	66,287			$	184,891		$	195,988
	Amounts recognized in the balance sheet:
	Non-current liability	$	(18,547	)		$	(43,685	)		$	(31,594	)	$	(32,591	)		$	(50,141	)	$	(76,276	)
	Amounts in accumulated other comprehensive loss:
	Unrecognized actuarial loss	$	55,180			$	75,370			$	19,177		$	21,068			$	74,357		$	96,438
Percentage Of Total Plan Assets	'
	The following table shows the percentage of total plan assets for each major category of plan assets:
		U.S. Plan						International Plans
		September 30,
		2013			2012			2013			2012
	Asset category:
	Equity securities	62	%		65	%		51	%		46	%
	Fixed income securities	38	%		33	%		27	%		27	%
	Insurance company	—	%		—	%		19	%		25	%
	Cash	—	%		2	%		3	%		2	%
		100	%		100	%		100	%		100	%
Expected Future Benefit Payments	'
	As of September 30, 2013, benefit payments expected to be paid over the next ten years are outlined in the following table:
		U.S. Plan				International				Total
						Plans
		(in thousands)
	Year ending September 30,
	2014	$	4,898			$	1,727			$	6,625
	2015	5,286				1,785				7,071
	2016	5,698				1,947				7,645
	2017	6,141				2,140				8,281
	2018	6,633				2,514				9,147
	2019 to 2023	40,715				18,620				59,335
U.S. Plan Assets Common Collective Trusts [Member]	'
Schedule of Available-for-sale Securities [Line Items]	'
Fair Value Of Plan Assets	'
		30-Sep-13
		Level 1				Level 2				Level 3			Total
		(in thousands)
	U.S. plan assets-common/collective trusts:
	Fixed income securities:
	U.S. Treasury, agency and other local government and non-corporate	$	—			$	15,690			$	—		$	15,690
	Mortgage-backed	—				10,179				—			10,179
	Corporate investment grade	—				9,254				—			9,254
	Corporate high yield	—				941				—			941
	U.S. equity securities:
	Large capitalization stocks	—				37,567				—			37,567
	Small capitalization stocks	—				9,553				—			9,553
	U.S. real estate investment trusts	—				77				—			77
	International equity securities:
	Large/mid capitalization stocks	—				11,294				—			11,294
	Small capitalization stocks	—				110				—			110
	Emerging large/mid capitalization stocks	—				83				—			83
	Commodities	—				83				—			83
		$	—			$	94,831			$	—		$	94,831
International Plan Assets [Member]	'
Schedule of Available-for-sale Securities [Line Items]	'
Fair Value Of Plan Assets	'
		30-Sep-13
		Level 1				Level 2				Level 3			Total
		(in thousands)
	International plan assets:
	Fixed income securities:
	Government	$	6,455			$	—			$	—		$	6,455
	Europe corporate investment grade	5,390				—				—			5,390
	Europe large capitalization stocks	21,952				—				—			21,952
	Insurance company funds (1)	—				8,429				—			8,429
	Cash	1,136				—				—			1,136
		$	34,933			$	8,429			$	—		$	43,362
	(1) These investments are comprised primarily of funds invested with an insurance company in Japan with a guaranteed rate of return. The insurance company invests these assets primarily in government and corporate bonds.

Segment_Information_Tables

Segment Information (Tables)	12 Months Ended
	Sep. 30, 2012
Operating Segments [Member]	'
Segment Reporting Information [Line Items]	'
Revenue And Operating Income	'
	The revenue and operating income attributable to these operating segments are summarized as follows:
		Year ended September 30,
		2013			2012			2011
		(in thousands)
	Software Products segment revenue	$	977,523		$	935,472		$	875,511
	Services segment revenue	316,018			320,207			291,438
	Total revenue	$	1,293,541		$	1,255,679		$	1,166,949
	Operating income: (1) (2)
	Software Products segment	$	605,963		$	598,344		$	557,879
	Services segment (3)	37,131			41,793			22,577
	Sales and marketing expenses	(378,771		)	(392,956		)	(353,051		)
	General and administrative expenses	(136,999		)	(119,085		)	(110,291		)
	Total operating income	$	127,324		$	128,096		$	117,114
	Other (expense) income, net	(1,090		)	(7,360		)	(12,566		)
	Income before income taxes	$	126,234		$	120,736		$	104,548
	-1	We recorded restructuring charges of $52.2 million in 2013. Software Products included $17.7 million; Services included $11.3 million; sales and marketing expenses included $18.1 million; and general and administrative expenses included $5.1 million of the total restructuring charges recorded in 2013. We recorded restructuring charges of $24.9 million in 2012. Software Products included $4.1 million; Services included $4.0 million; sales and marketing expenses included $15.2 million; and general and administrative expenses included $1.6 million of the total restructuring charges recorded in 2012.
	-2	The Software Products segment operating income includes depreciation and amortization of $27.3 million, $25.4 million, and $24.8 million in 2013, 2012, and 2011, respectively. The Services segment operating income includes depreciation and amortization of $5.0 million, $3.6 million, and $3.8 million in 2013, 2012, and 2011, respectively.
	-3	In the first quarter of 2011, we made a strategic decision to enter into a contract with a customer in the automotive industry, for which we expected our costs to exceed our revenue by approximately $5 million. Services segment operating income in 2011 included immediate recognition of the approximately $5 million estimated loss on this contract and resulted in a reduction of service margins by approximately 2%.
Products and Services Segments [Member]	'
Segment Reporting Information [Line Items]	'
Revenue And Operating Income	'
		Year ended September 30,
		2013			2012			2011
		(in thousands)
	CAD	$	552,510		$	573,457		$	587,824
	Extended PLM	572,313			604,339			503,128
	SLM	168,718			77,883			75,997
	Total revenue	$	1,293,541		$	1,255,679		$	1,166,949
Geographical Segments [Member]	'
Segment Reporting Information [Line Items]	'
Revenue And Operating Income	'
	Data for the geographic regions in which we operate is presented below. Amounts for the years ended September 30, 2012 and 2011 include immaterial reclassifications between geographic regions made to conform to the current year classification.
		Year ended September 30,
		2013			2012			2011
		(in thousands)
	Revenue:
	Americas (1)	$	522,788		$	479,932		$	429,213
	Europe (2)	479,877			480,287			466,540
	Pacific Rim	161,587			160,834			147,992
	Japan	129,289			134,626			123,204
	Total revenue	$	1,293,541		$	1,255,679		$	1,166,949
		September 30,
		2013			2012			2011
		(in thousands)
	Long-lived tangible assets:
	Americas (3)	$	49,788		$	46,083		$	42,767
	Europe	5,557			6,649			6,989
	Asia-Pacific	9,307			10,734			12,813
	Total long-lived tangible assets	$	64,652		$	63,466		$	62,569
	-1	Includes revenue in the United States totaling $485.2 million, $453.2 million and $408.0 million for 2013, 2012 and 2011, respectively.
	-2	Includes revenue in Germany totaling $167.2 million, $188.3 million and $173.3 million for 2013, 2012 and 2011, respectively.
	-3	Substantially all of the Americas long-lived tangible assets are located in the United States.

Subsequent_Events_Tables

Subsequent Events (Tables)	12 Months Ended
	Sep. 30, 2012
Subsequent Events [Abstract]	'
Schedule Of Restricted Units Granted	'
	On November 11, 2013, we granted the restricted stock units shown in the table below. The performance-based RSUs were issued to employees, including some of our executive officers, and are earned based on achievement of performance conditions established by the Compensation Committee of our Board of Directors on the grant date and are also subject to service conditions. Of these performance-based RSUs:
	• 24 thousand are eligible to vest to the extent earned in three substantially equal installments on the later of November 15, 2014 or the date the Compensation Committee determines the extent to which the applicable performance criteria have been achieved, November 15, 2015 and November 15, 2016, and
	•317 thousand are eligible to vest to the extent earned in three substantially equal installments on (i) the later of November 15, 2014 or the date the Compensation Committee determines the extent to which the applicable performance criteria have been achieved, (ii) the later of November 15, 2015 or the date the Compensation Committee determines the extent to which the applicable performance criteria have been achieved, and (iii) the later of November 15, 2016 or the date the Compensation Committee determines the extent to which the applicable performance criteria have been achieved; RSUs not earned for a period may be earned in subsequent periods.
	The time-based RSUs were issued to employees, including some of our executive officers, and will vest in three substantially equal annual installments from the grant date.
		Performance-Based RSUs		Time-Based RSUs
		(in thousands)
	Number Granted	341		748
	Intrinsic Value	$	10,959	$	24,060

Summary_Of_Significant_Account3

Summary Of Significant Accounting Policies (Narrative) (Details)

12 Months Ended

3 Months Ended

12 Months Ended

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2011

Sep. 30, 2010

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Jul. 02, 2011

Jun. 30, 2011

Jun. 30, 2011

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

USD ($)

USD ($)

USD ($)

USD ($)

Accounts Receivable [Member]

Accounts Receivable [Member]

Other Assets [Member]

Other Assets [Member]

MKS Inc [Member]

MKS Inc [Member]

MKS Inc [Member]

Other Current Assets [Member]

Other Current Assets [Member]

Other Current Liabilities [Member]

Standard & Poor's, BBB-1 Rating and Above-Tier 1 [Member]

Standard & Poor's, BBB-1 Rating and Above-Tier 1 [Member]

Internally Assigned Grade, Tier 2 [Member]

Internally Assigned Grade, Tier 2 [Member]

Internally Assigned Grade, Tier 3 [Member]

Internally Assigned Grade, Tier 3 [Member]

Minimum [Member]

Minimum [Member]

Minimum [Member]

Minimum [Member]

Minimum [Member]

Maximum [Member]

Maximum [Member]

Maximum [Member]

Maximum [Member]

Maximum [Member]

customers

customers

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

CAD

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

Purchased Software [Member]

Customer Lists [Member]

Trademarks And Trade Names [Member]

Computer Hardware And Software [Member]

Furniture And Fixtures [Member]

Purchased Software [Member]

Customer Lists [Member]

Trademarks And Trade Names [Member]

Computer Hardware And Software [Member]

Furniture And Fixtures [Member]

M

Summary Of Significant Accounting Policies [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Maximum payment terms on software purchases for credit-worthy customers (in months)

24

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Billed but uncollected maintenance receivable

'

'

'

'

'

'

$108,600,000

$110,700,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Major number of customers

0

'

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Ceiling percentage of revenue for major customer

10.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Allowance for doubtful accounts receivable

3,000,000

3,400,000

3,900,000

4,600,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Accounts receivable written-off, net of recoveries

600,000

800,000

800,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Bad debt expense including general and administrative expense

213,000

258,000

51,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Financing receivables

53,123,000

42,463,000

'

'

'

'

'

'

'

'

'

'

'

'

42,189,000

34,017,000

10,934,000

8,446,000

0

0

'

'

'

'

'

'

'

'

'

'

Financing receivables, current

'

'

'

'

36,100,000

29,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Long-term accounts receivable from customers for contracts with extended payment terms

'

'

'

'

'

'

17,000,000

13,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Financing receivables past due

0

'

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Reserve for credit losses

'

0

0

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Sale of finance receivable

17,000,000

14,300,000

4,100,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Uncollectible financing receivables written-off

'

0

0

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Fair value of our forward contracts

124,434,000

133,903,000

'

'

'

'

'

'

'

'

'

300,000

200,000

400,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net losses on foreign currency exposures

2,000,000

5,900,000

12,300,000

'

'

'

'

'

4,400,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net realized and unrealized (gain) loss on forward contracts (excluding the underlying foreign currency exposure being hedged)

3,400,000

3,600,000

4,100,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Foreign currency forward contract

'

'

'

'

'

'

'

'

'

305,000,000

292,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Development costs for software

0

'

0

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Amortizable intangible assets

54,000,000

44,900,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Amortization period, minimum (in years)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'3 years

'4 years

'3 years

'3 years

'3 years

'10 years

'12 years

'7 years

'5 years

'8 years

Advertising expense

4,200,000

2,800,000

2,600,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Cumulative translation adjustment gains (loss)

'

-400,000

-7,600,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax

74,357,000

96,438,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Pension benefits net of tax

'

($50,800,000)

($64,900,000)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Summary_Of_Significant_Account4

Summary Of Significant Accounting Policies (Revenue Recognition) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
	source
Accounting Policies [Abstract]	'	'	'
Primary sources of revenue	3	'	'
License revenue	$344,209	$348,394	$342,121
Maintenance revenue	654,679	611,943	557,678
Total revenue	$1,293,541	$1,255,679	$1,166,949

Summary_Of_Significant_Account5

Summary Of Significant Accounting Policies (Deferred Revenue) (Details) (USD $)	Sep. 30, 2013	Sep. 30, 2012
In Thousands, unless otherwise specified
Deferred Revenue Arrangement [Line Items]	'	'
Deferred revenue	$336,913	$327,529
Deferred Maintenance Revenue [Member]	'	'
Deferred Revenue Arrangement [Line Items]	'	'
Deferred revenue	312,721	306,940
Deferred Other Service Revenue [Member]	'	'
Deferred Revenue Arrangement [Line Items]	'	'
Deferred revenue	18,793	14,127
Deferred License Revenue [Member]	'	'
Deferred Revenue Arrangement [Line Items]	'	'
Deferred revenue	$5,399	$6,462

Summary_Of_Significant_Account6

Summary Of Significant Accounting Policies (Financial Assets And Liabilities Measured At Fair Value On Recurring Basis) (Details) (USD $)	Sep. 30, 2013		Sep. 30, 2012
In Thousands, unless otherwise specified
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Financial assets, Total	$57,007		$231,724
Level 1 [Member]	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Cash equivalents-Level 1	56,706	[1]	231,488	[1]
Level 2 [Member]	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Forward contracts-Level 2	301		236
Derivative Liability	$438		'
[1]	Money market funds and time deposits.

Summary_Of_Significant_Account7

Summary Of Significant Accounting Policies (Notional Amounts Of Outstanding Forward Contracts) (Details) (USD $)	Sep. 30, 2013	Sep. 30, 2012
In Thousands, unless otherwise specified
Fair value of our forward contracts	$124,434	$133,903
Canadian/U.S. Dollar [Member]	'	'
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value	41,852	54,133
Euro/U.S. Dollar [Member]	'	'
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value	50,902	53,716
Chinese Renminbi/U.S. Dollar [Member]	'	'
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value	0	3,666
Japanese Yen/U.S. Dollar [Member]	'	'
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value	6,496	13,415
Swiss Franc/U.S. Dollar [Member]	'	'
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value	9,678	0
All Other [Member]	'	'
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value	$15,506	$8,973

Summary_Of_Significant_Account8

Summary Of Significant Accounting Policies (Earnings Per Share Basic And Diluted) (Details) (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Accounting Policies [Abstract]	'	'	'
Net income (loss)	$143,769	($35,398)	$85,424
Weighted average shares outstanding (in shares)	119,473	118,705	117,579
Dilutive effect of employee stock options, restricted shares and restricted stock units (in shares)	1,767	2,300	3,395
Diluted weighted average shares outstanding (in shares)	121,240	118,705	120,974
Basic earnings (loss) per share (in USD per share)	$1.20	($0.30)	$0.73
Diluted earnings (loss) per share (in USD per share)	$1.19	($0.30)	$0.71

Summary_Of_Significant_Account9

Summary Of Significant Accounting Policies Summary Of Significant Accounting Policies (Excluded Antidilutive Securities) (Details) (Stock Options [Member])	12 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2010
Stock Options [Member]	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'
Anti-dilutive securities excluded from computation of EPS (in shares)	0.2

Recovered_Sheet2

Summary Of Significant Accounting Policies (Related Party Transaction) (Details) (USD $)	0 Months Ended		12 Months Ended	0 Months Ended
	Nov. 15, 2012	Nov. 15, 2011	Sep. 30, 2013	Nov. 15, 2013
		Director [Member]	Director [Member]	Subsequent Event [Member]
		Restricted Stock [Member]	Restricted Stock [Member]
Related Party Transaction [Line Items]	'	'	'	'
Granted, value	'	$200,000	'	'
Shares granted	'	9,402	'	'
Awards vested in period, percentage	50.00%	'	'	50.00%
Estimated future fees to be paid, maximum	'	'	$60,000	'

Restructuring_Charges_Narrativ

Restructuring Charges (Narrative) (Details) (USD $)	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
	employees	employees
Restructuring [Abstract]	'	'	'
Restructuring charges	$52,197,000	$24,928,000	$0
Restructuring Charges, Gross	52,448,000	'	'
Restructuring Reserve, Accrual Adjustment	200,000	'	'
Severance costs	51,000,000	24,400,000	'
Number of employees associated with costs	553	209	'
Other restructuring costs (benefits)	$1,500,000	$500,000	'

Restructuring_Charges_Details

Restructuring Charges (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Restructuring Reserve [Roll Forward]	'	'	'
Balance, beginning of period	$4,461	$666	$1,165
Restructuring charges	52,197	24,928	0
Cash disbursements	-37,199	-20,947	-502
Foreign currency impact	70	-186	3
Balance, end of period	19,529	4,461	666
Restructuring Charges [Member]	'	'	'
Restructuring Reserve [Roll Forward]	'	'	'
Balance, beginning of period	4,461	666	1,165
Restructuring charges	-251	'	'
Cash disbursements	-4,225	-20,947	-502
Foreign currency impact	15	-186	3
Balance, end of period	0	4,461	666
Employee Severance And Related Benefits [Member]	'	'	'
Restructuring Reserve [Roll Forward]	'	'	'
Balance, beginning of period	0	0	0
Restructuring charges	50,954	'	'
Cash disbursements	-31,781	0	0
Foreign currency impact	60	0	0
Balance, end of period	19,233	0	0
Facility Closures and Other Costs [Member]	'	'	'
Restructuring Reserve [Roll Forward]	'	'	'
Balance, beginning of period	0	0	0
Restructuring charges	1,494	'	'
Cash disbursements	-1,193	0	0
Foreign currency impact	-5	0	0
Balance, end of period	$296	$0	$0

Property_And_Equipment_Details

Property And Equipment (Details) (USD $)	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Property, Plant and Equipment [Abstract]	'	'	'
Computer hardware and software	$217,724,000	$224,558,000	'
Furniture and fixtures	19,211,000	20,878,000	'
Leasehold improvements	35,289,000	46,393,000	'
Gross property and equipment	272,224,000	291,829,000	'
Accumulated depreciation and amortization	-207,572,000	-228,363,000	'
Net property and equipment	64,652,000	63,466,000	62,569,000
Depreciation expense	$31,500,000	$30,400,000	$28,700,000

Acquisitions_Narrative_Details

Acquisitions (Narrative) (Details) (USD $)

12 Months Ended

1 Months Ended

12 Months Ended

3 Months Ended

12 Months Ended

0 Months Ended

12 Months Ended

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2011

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2011

Sep. 30, 2011

Sep. 30, 2012

31-May-11

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2012

Servigistics, Enigma and NetIDEAS [Member]

NetIDEAS and Enigma [Member]

Servigistics [Member]

Servigistics [Member]

MKS and 4CS [Member]

MKS and 4CS [Member]

4CS [Member]

4CS [Member]

MKS Inc [Member]

MKS Inc [Member]

Purchased Software [Member]

Purchased Software [Member]

Customer Lists and Relationships [Member]

Trademarks And Trade Names [Member]

Trademarks And Trade Names [Member]

Services [Member]

Services [Member]

employees

employees

Servigistics [Member]

Servigistics [Member]

Servigistics [Member]

Servigistics [Member]

4CS [Member]

Revenue from acquisition

'

'

'

$94,900,000

'

'

$80,000,000

$81,500,000

$26,800,000

'

'

'

'

'

'

'

'

'

'

'

Acquisition-related cost

9,900,000

3,800,000

7,800,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of employees added by acquisition

'

'

'

'

'

'

400

'

'

200

'

'

'

'

'

'

'

'

'

'

Business acquisition, cost of acquired entity, cash paid

245,843,000

220,000

280,026,000

'

25,000,000

220,818,000

'

'

'

14,900,000

'

265,200,000

'

'

'

'

'

'

'

'

Acquisition of businesses, net cash acquired

'

'

'

'

-1,000,000

1,400,000

'

'

'

-100,000

'

-33,200,000

'

'

'

'

'

'

'

'

Goodwill acquired

'

'

'

'

14,300,000

'

139,833,000

'

'

'

-950,000

'

'

'

'

'

'

'

12,800,000

0

Intangible assets acquired

133,500,000

'

'

'

15,200,000

'

118,300,000

'

'

'

'

'

'

'

49,900,000

66,000,000

'

2,400,000

'

'

Deferred Tax Liabilities, Intangible Assets

'

'

'

'

5,300,000

35,600,000

35,600,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Deferred tax assets, change in valuation allowance

'

'

'

'

'

'

$32,600,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Weighted average useful lives of acquired intangible assets

'

'

'

'

'

'

'

'

'

'

'

'

'

'8 years

'9 years

'10 years

'7 years

'7 years

'

'

Business acquisition date

'

'

'

'

'

'

'

'

'

'

'

'

31-May-11

'

'

'

'

'

'

'

Acquisitions_Pro_Forma_Financi

Acquisitions (Pro Forma Financial Information) (Details) (USD $)	12 Months Ended		1 Months Ended
In Millions, except Per Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013
	Servigistics [Member]	Servigistics [Member]	MKS Inc [Member]
Business Acquisition [Line Items]	'	'	'
Revenue	$1,296.60	$1,328.50	$1,227.80
Net income	$116.50	($11.60)	$93
Earnings per share-Basic (in USD per share)	$0.98	($0.10)	$0.79
Earnings per share-Diluted (in USD per share)	$0.96	($0.10)	$0.77

Acquisitions_Acquisitions_Purc

Acquisitions Acquisitions (Purchase Price Allocation) (Details) (USD $)	12 Months Ended			1 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2013
				Servigistics [Member]
Business Acquisition [Line Items]	'	'	'	'
Goodwill	$769,095,000	$610,347,000	$613,394,000	$139,833,000
Identifiable intangible assets	'	'	'	118,300,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents	'	'	'	1,355,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables	'	'	'	20,536,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	'	'	'	3,588,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Deferred Revenue	'	'	'	-11,714,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent	'	'	'	-35,566,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other	'	'	'	-14,159,000
Cash Acquired from Acquisition	'	'	'	-1,400,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net	'	'	'	222,173,000
Payments to Acquire Businesses, Net of Cash Acquired	$245,843,000	$220,000	$280,026,000	$220,818,000

Goodwill_and_Acquired_Intangib1

Goodwill and Acquired Intangible Assets (Narrative) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2012	Sep. 30, 2013
	segments
Number of reportable segments	2	'
Estimated aggregate future amortization expense for intangible assets, 2014	'	$48.90
Estimated aggregate future amortization expense for intangible assets, 2015	'	47.1
Estimated aggregate future amortization expense for intangible assets, 2016	'	39.7
Estimated aggregate future amortization expense for intangible assets, 2017	'	35.9
Estimated aggregate future amortization expense for intangible assets, 2018	'	31.9
Estimated aggregate future amortization expense for intangible assets, thereafter	'	69.6
Software Products [Member]	'	'
Goodwill and acquired intangible assets	768.1	979.3
Services [Member]	'	'
Goodwill and acquired intangible assets	28.1	$62.90

Goodwill_and_Acquired_Intangib2

Goodwill and Acquired Intangible Assets (Goodwill and Acquired Intangible Assets) (Details) (USD $)

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2011

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

In Thousands, unless otherwise specified

Purchased Software [Member]

Purchased Software [Member]

Capitalized Software [Member]

Capitalized Software [Member]

Customer Lists and Relationships [Member]

Customer Lists and Relationships [Member]

Trademarks And Trade Names [Member]

Trademarks And Trade Names [Member]

Other [Member]

Other [Member]

Goodwill (not amortized), Net Book Value

$769,095

$610,347

$613,394

'

'

'

'

'

'

'

'

'

'

Intangible assets with finite lives (amortized), Gross Carrying Amount

578,088

[1]

441,590

[1]

'

233,566

[1]

177,166

[1]

22,877

[1]

22,877

[1]

304,434

[1]

227,097

[1]

13,427

[1]

11,013

[1]

3,784

[1]

3,437

[1]

Intangible assets with finite lives (amortized), Accumulated Amortization

304,967

[1]

255,705

[1]

'

148,127

[1]

127,250

[1]

22,877

[1]

22,877

[1]

120,338

[1]

93,215

[1]

10,097

[1]

8,967

[1]

3,528

[1]

3,396

[1]

Intangible assets with finite lives (amortized), Net Book Value

273,121

[1]

185,885

[1]

'

85,439

[1]

49,916

[1]

0

[1]

0

[1]

184,096

[1]

133,882

[1]

3,330

[1]

2,046

[1]

256

[1]

41

[1]

Total goodwill and acquired intangible assets

$1,042,216

$796,232

'

'

'

'

'

'

'

'

'

'

'

Weighted average useful lives (in years)

'

'

'

'8 years

'

'

'

'10 years

'

'7 years

'

'3 years

'

[1]

The weighted average useful lives of purchased software, customer lists and relationships, trademarks and trade names and other intangible assets with a remaining net book value are 8 years, 10 years, 7 years and 3 years, respectively.

Goodwill_and_Acquired_Intangib3

Goodwill and Acquired Intangible Assets (Schedule Of Movements of Goodwill by Reportable Segment) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Goodwill [Roll Forward]	'	'
Balance, beginning of period	$610,347	$613,394
Foreign currency translation and other adjustments	4,568	-2,097
Balance, end of period	769,095	610,347
Software Products [Member]	'	'
Goodwill [Roll Forward]	'	'
Balance, beginning of period	585,469	588,443
Foreign currency translation and other adjustments	4,476	-2,024
Balance, end of period	720,548	585,469
Services [Member]	'	'
Goodwill [Roll Forward]	'	'
Balance, beginning of period	24,878	24,951
Foreign currency translation and other adjustments	92	-73
Balance, end of period	48,547	24,878
4CS [Member]	'	'
Goodwill [Roll Forward]	'	'
Acquisitions	'	-950
4CS [Member] | Software Products [Member]	'	'
Goodwill [Roll Forward]	'	'
Acquisitions	'	-950
4CS [Member] | Services [Member]	'	'
Goodwill [Roll Forward]	'	'
Acquisitions	'	0
Servigistics [Member]	'	'
Goodwill [Roll Forward]	'	'
Acquisitions	139,833	'
Balance, end of period	139,833	'
Servigistics [Member] | Software Products [Member]	'	'
Goodwill [Roll Forward]	'	'
Acquisitions	127,033	'
Servigistics [Member] | Services [Member]	'	'
Goodwill [Roll Forward]	'	'
Acquisitions	12,800	'
NetIDEAS [Member]	'	'
Goodwill [Roll Forward]	'	'
Acquisitions	10,196	'
NetIDEAS [Member] | Software Products [Member]	'	'
Goodwill [Roll Forward]	'	'
Acquisitions	0	'
NetIDEAS [Member] | Services [Member]	'	'
Goodwill [Roll Forward]	'	'
Acquisitions	10,196	'
Enigma [Member]	'	'
Goodwill [Roll Forward]	'	'
Acquisitions	4,151	'
Enigma [Member] | Software Products [Member]	'	'
Goodwill [Roll Forward]	'	'
Acquisitions	3,570	'
Enigma [Member] | Services [Member]	'	'
Goodwill [Roll Forward]	'	'
Acquisitions	$581	'

Goodwill_and_Acquired_Intangib4

Goodwill and Acquired Intangible Assets (Amortization Of Intangible Assets) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Goodwill and Intangible Assets Disclosure [Abstract]	'	'	'
Amortization of acquired intangible assets	$26,486	$20,303	$18,319
Cost of license revenue	18,586	15,819	15,393
Total amortization expense	$45,072	$36,122	$33,712

Income_Taxes_Narrative_Details

Income Taxes (Narrative) (Details) (USD $)	3 Months Ended	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Income Tax Disclosure [Line Items]	'	'	'	'	'
Effective income tax rate	'	-14.00%	129.00%	18.00%	'
Income before income taxes	'	$126,234,000	$120,736,000	$104,548,000	'
Statutory federal income tax rate	'	35.00%	35.00%	35.00%	'
Effective Income Tax Rate Reconciliation, Foreign Income Tax Withholding, Amount	'	6,000,000	'	'	'
Effective Income Tax Rate Reconciliation, Tax Settlement, Foreign, Amount	'	5,300,000	'	'	'
Intangible assets acquired	'	133,500,000	'	'	'
Deferred Tax Liabilities, Other Finite-Lived Assets	'	-40,900,000	'	'	'
Effect of change in the tax status of the foreign legal entity	'	'	4,200,000	'	'
Effective income tax rate, one-time increase	'	0.00%	3.00%	1.00%	'
Tax benefit related to research and development	'	'	'	2,300,000	'
Net increase provision for income tax benefit	'	'	'	1,500,000	'
Tax provision related to research and development cost sharing prepayment	'	2,000,000	7,800,000	7,500,000	6,000,000
Prepaid income taxes	700,000	11,500,000	700,000	'	'
Income taxes payable	16,400,000	14,400,000	16,400,000	'	'
Accrued income taxes	800,000	7,100,000	800,000	'	'
Other current liabilities	4,400,000	2,100,000	4,400,000	'	'
Other liabilities	11,200,000	5,200,000	11,200,000	'	'
Income tax payments	'	35,400,000	53,000,000	28,100,000	'
Net deferred tax assets	11,283,000	4,400,000	11,283,000	'	'
Establish valuation allowance in the U.S. on foreign tax credits	124,500,000	0	124,500,000	0	'
Net operating loss carryforwards	'	79,000,000	'	'	'
Valuation allowance	170,404,000	156,547,000	170,404,000	38,600,000	40,500,000
Interest expense	'	-1,200,000	300,000	300,000	'
Penalty expense	'	0	100,000	100,000	'
Interest expense related to income tax accruals	2,300,000	1,100,000	2,300,000	'	'
Accrued tax penalties	100,000	100,000	100,000	'	'
Unrecognized tax benefit	19,100,000	13,700,000	19,100,000	16,200,000	15,900,000
Income tax provision upon recognition of unrecognized tax benefit	'	12,900,000	'	'	'
Unrecognized tax benefits, increase in valuation allowance upon recognition	'	7,600,000	'	'	'
Unrecognized tax benefits, increase to additional paid-in capital upon recognition	'	800,000	'	'	'
Potential decrease in unrecognized tax benefits	'	2,000,000	'	'	'
Stock-based compensation	'	48,787,000	51,305,000	45,402,000	'
Tax benefit recognition related to stock based compensation	'	2,700,000	3,900,000	15,200,000	'
Increase (decrease) in income taxes payable	'	15,211,000	4,005,000	-18,931,000	'
Windfall tax deductions not yet recognized	'	39,300,000	'	'	'
Income tax charge (reversal) on undistributed earnings of foreign subsidiaries	'	'	'	6,500,000	'
Undistributed earnings of subsidiaries	267,000,000	378,000,000	267,000,000	'	'
Deferred Tax Assets, Tax Credit Carryforwards, Foreign	0	5,994,000	0	'	'
Domestic Country [Member]	'	'	'	'	'
Income Tax Disclosure [Line Items]	'	'	'	'	'
Business reorganization taxable gains	'	'	'	46,400,000	'
Valuation allowance	'	129,900,000	'	'	'
Intercompany loan receivable from foreign subsidiary	'	154,400,000	'	'	'
Deferred Tax Assets, Tax Credit Carryforwards, Foreign	'	6,000,000	'	'	'
Domestic Country [Member] | Research Tax Credit Carryforward [Member]	'	'	'	'	'
Income Tax Disclosure [Line Items]	'	'	'	'	'
Credit carryforwards	'	14,700,000	'	'	'
Foreign Country [Member]	'	'	'	'	'
Income Tax Disclosure [Line Items]	'	'	'	'	'
Net operating loss carryforwards	'	143,900,000	'	'	'
Valuation allowance	'	26,600,000	'	'	'
Credit carryforwards	'	6,800,000	'	'	'
Japan [Member]	'	'	'	'	'
Income Tax Disclosure [Line Items]	'	'	'	'	'
Impact of a Japanese legislative change on our Japan entities' deferred tax assets	'	'	1,400,000	'	'
Windfall Tax Benefit [Member]	'	'	'	'	'
Income Tax Disclosure [Line Items]	'	'	'	'	'
Increase (decrease) in income taxes payable	'	300,000	1,100,000	9,400,000	'
Windfall tax deductions not yet recognized	'	23,000,000	'	'	'
Massachusetts Research And Development Member | Research Tax Credit Carryforward [Member]	'	'	'	'	'
Income Tax Disclosure [Line Items]	'	'	'	'	'
Credit carryforwards	'	19,400,000	'	'	'
All Acquisitions [Member]	'	'	'	'	'
Income Tax Disclosure [Line Items]	'	'	'	'	'
Net operating loss carryforwards	'	55,700,000	'	'	'
Servigistics and Enigma [Member]	'	'	'	'	'
Income Tax Disclosure [Line Items]	'	'	'	'	'
Deferred tax assets, change in valuation allowance	'	-36,700,000	'	'	'
Net operating loss carryforwards	'	41,900,000	'	'	'
Prior Acquisitions [Member]	'	'	'	'	'
Income Tax Disclosure [Line Items]	'	'	'	'	'
Net operating loss carryforwards	'	13,800,000	'	'	'
Deferred Tax Asset, Pension [Member]	'	'	'	'	'
Income Tax Disclosure [Line Items]	'	'	'	'	'
Deferred tax assets, change in valuation allowance	'	($7,900,000)	'	'	'

Income_Taxes_Summary_Of_Income

Income Taxes (Summary Of Income (Loss) Before Income Taxes) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Income Tax Disclosure [Abstract]	'	'	'
Domestic	$6,112	($11,422)	($23,984)
Foreign	120,122	132,158	128,532
Total income before income taxes	$126,234	$120,736	$104,548

Income_Taxes_Schedule_Of_Provi

Income Taxes (Schedule Of Provision For (Benefit From) Income Taxes) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Income Tax Disclosure [Abstract]	'	'	'
Federal	$7,081	$8,534	$22,849
State	1,512	1,733	-192
Foreign	13,586	41,101	31,530
Current provision for income taxes	22,179	51,368	54,187
Federal	-38,224	106,041	-31,303
State	-4,718	7,706	-2,176
Foreign	3,228	-8,981	-1,584
Deferred provision for (benefit from) income taxes	-39,714	104,766	-35,063
Total provision for income taxes	($17,535)	$156,134	$19,124

Income_Taxes_Summary_Of_Federa

Income Taxes (Summary Of Federal Income Tax Rate And Effective Income Tax Rate) (Details)	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Income Tax Disclosure [Abstract]	'	'	'
Statutory federal income tax rate	35.00%	35.00%	35.00%
Change in valuation allowance	-32.00%	103.00%	3.00%
State income taxes, net of federal tax benefit	1.00%	0.00%	-2.00%
Federal and state research and development credits	-1.00%	-1.00%	-5.00%
Tax audit and examination settlements	-1.00%	1.00%	0.00%
Foreign rate differences	-26.00%	-16.00%	-15.00%
Effective Income Tax Rate Reconciliation, Foreign Income Tax Withholding, Percent	5.00%	3.00%	0.00%
Subsidiary reorganization	0.00%	3.00%	1.00%
Other, net	5.00%	1.00%	1.00%
Effective income tax rate	-14.00%	129.00%	18.00%

Income_Taxes_Schedule_Of_Defer

Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) (USD $)	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
In Thousands, unless otherwise specified
Income Tax Disclosure [Abstract]	'	'	'	'
Net operating loss carryforwards	$47,770	$23,879	'	'
Foreign tax credits	5,994	0	'	'
Capitalized research and development expense	51,237	59,562	'	'
Pension benefits	30,870	35,676	'	'
Deferred maintenance revenue	63,976	58,791	'	'
Stock-based compensation	18,045	17,137	'	'
Accrual for litigation	0	16,310	'	'
Other reserves not currently deductible	19,343	12,058	'	'
Amortization of intangible assets	5,772	10,658	'	'
Other tax credits	31,263	23,899	'	'
Depreciation	3,077	5,582	'	'
Other	4,396	5,984	'	'
Gross deferred tax assets	281,743	269,536	'	'
Valuation allowance	-156,547	-170,404	-38,600	-40,500
Total deferred tax assets	125,196	99,132	'	'
Acquired intangible assets not deductible	-88,134	-53,030	'	'
Pension prepayments	-15,607	-12,475	'	'
Deferred revenue	-12,592	-21,693	'	'
Other	-4,463	-651	'	'
Total deferred tax liabilities	120,796	87,849	'	'
Net deferred tax assets	$4,400	$11,283	'	'

Income_Taxes_Summary_Of_Valuat

Income Taxes (Summary Of Valuation Allowance) (Details) (USD $)	3 Months Ended	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2011
Movement in Valuation Allowances and Reserves [Roll Forward]	'	'		'		'
Valuation allowance beginning of year	'	$170,404,000		$38,600,000		$40,500,000
Net release of valuation allowance	'	-44,600,000	[1]	0	[1]	-2,400,000	[1]
Establish valuation allowance in the U.S. on foreign tax credits	124,500,000	0		124,500,000		0
Net increase in deferred tax assets for foreign jurisdictions with a full valuation allowance	'	1,900,000		-2,100,000		-800,000
Net decrease in deferred tax assets for foreign jurisdictions with a full valuation allowance	'	12,100,000		0		0
Establish valuation allowance in foreign jurisdictions	'	0		600,000		0
Adjust deferred tax asset and valuation allowance in the U.S. primarily for tax credits	'	16,700,000		8,800,000		1,300,000
Valuation allowance end of year	$170,404,000	$156,547,000		$170,404,000		$38,600,000
[1]	In 2013, this is attributable to recognition of deferred tax liabilities recorded in connection with accounting for 2013 acquisitions and a reduction in deferred tax assets associated with our U.S. pension plan, both of which are described above.

Income_Taxes_Schedule_Of_Unrec

Income Taxes (Schedule Of Unrecognized Tax Benefit) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]	'	'	'
Unrecognized tax benefit beginning of year	$19.10	$16.20	$15.90
Tax positions related to current year:	'	'	'
Additions	1	3.4	1.1
Tax positions related to prior years:	'	'	'
Additions	1.8	1.4	0.7
Reductions	-6.3	-0.5	-1.5
Settlements	-0.7	0	0
Statute expirations	-1.2	1.4	0
Unrecognized tax benefit end of year	$13.70	$19.10	$16.20

Long_Term_Debt_Details

Long Term Debt (Details) (USD $)

1 Months Ended

12 Months Ended

12 Months Ended

12 Months Ended

12 Months Ended

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2011

Aug. 31, 2012

Sep. 30, 2010

Sep. 30, 2013

Sep. 30, 2013

Nov. 15, 2013

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

banks

Maximum [Member]

Minimum [Member]

Term Loan [Member]

Term Loan [Member]

Term Loan [Member]

Line of Credit [Member]

Line of Credit [Member]

Line of Credit [Member]

Line of Credit [Member]

LIBOR for Eurodollar-Based Borrowings [Member]

LIBOR for Eurodollar-Based Borrowings [Member]

Base Rate [Member]

Base Rate [Member]

Maximum [Member]

Minimum [Member]

Line of Credit [Member]

Line of Credit [Member]

Line of Credit [Member]

Line of Credit [Member]

Maximum [Member]

Minimum [Member]

Maximum [Member]

Minimum [Member]

Debt Instrument [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Credit facility syndicate, number of participating banks

'

'

'

'

10

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Credit facility, current maximum amount

'

'

'

'

'

'

'

'

'

$150,000,000

'

'

$300,000,000

'

'

'

'

'

'

Credit facility, additional borrowing limit

'

150,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Credit facility, revolving loan, repayments of principal due in 2014

'

'

'

'

'

'

'

'

'

15,000,000

'

'

'

'

'

'

'

'

'

Credit facility, revolving loan, repayments of principal due in 2015

'

'

'

'

'

'

'

'

'

'

15,000,000

'

'

'

'

'

'

'

'

Credit facility, revolving loan, repayments of principal due in 2016

'

'

'

'

'

'

'

'

'

'

22,500,000

'

'

'

'

'

'

'

'

Credit facility, revolving loan, repayments of principal due in 2017

'

'

'

'

'

'

'

'

'

'

90,000,000

'

'

'

'

'

'

'

'

Credit facility, borrowings outstanding

370,000,000

258,100,000

370,000,000

'

'

0

'

'

'

142,500,000

'

'

115,600,000

'

'

'

'

'

'

Borrowings under revolving credit facility

230,000,000

0

230,000,000

250,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Voting interest in foreign subsidiaries pledged against credit facility

'

65.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Credit facility, variable interest rate, length of time between updates

'

'

'

'

'

'

'180 days

'30 days

'

'

'

'

'

'

'

'

'

'

'

Credit facility, term loan, interest rate at period end

'

'

'

'

'

'

'

'

1.50%

1.56%

'

'

1.56%

'

'

'

'

'

'

Debt Instrument, Basis Spread on Variable Rate

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1.50%

1.25%

0.50%

0.25%

Credit facility, revolving loan, basis spread on federal funds effective rate

'

'

'

'

'

'

'

'

'

'

'

0.01%

'

'

'

'

'

'

'

Credit facility, revolving loan, basis spread on adjusted LIBOR

'

'

'

'

'

'

'

'

'

'

'

1.00%

'

'

'

'

'

'

'

Credit facility, revolving loan, commitment fees percentage

'

'

'

'

'

'

'

'

'

'

'

'

'

0.30%

0.20%

'

'

'

'

Investment limit in foreign subsidiaries

50,000,000

'

50,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Cash investment limit for acquisition of business

75,000,000

'

75,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Maximum leverage ratio allowed under debt covenant

2.5

'

2.5

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Minimum fixed charge coverage ratio allowed under debt covenant

3.5

'

3.5

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Leverage ratio, actual

0.94

'

0.94

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Fixed charge coverage ratio, actual

18.43

'

18.43

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Credit facility, origination costs

'

'

1,800,000

1,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Credit facility, periodic interest payment

'

$5,800,000

$3,700,000

$1,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Credit facility, average interest rate during period

'

1.70%

1.80%

2.10%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Commitments_And_Contingencies_1

Commitments And Contingencies (Narrative) (Details) (USD $)	3 Months Ended	12 Months Ended			3 Months Ended
In Millions, unless otherwise specified	Jan. 01, 2011	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2012
					CHINA	CHINA	Pending or Threatened Litigation [Member]
					Geographic Concentration Risk [Member]	Geographic Concentration Risk [Member]
					Sales Revenue, Services, Net [Member]	Sales Revenue, Services, Net [Member]
					Minimum [Member]	Maximum [Member]
Commitments And Contingencies [Line Items]	'	'	'	'	'	'	'
Lease expense, net of sublease income	'	$38.40	$37.80	$35.70	'	'	'
Lease renewal term	'10 years	'	'	'	'	'	'
Annual base rent plus operating expenses	'	7.4	'	'	'	'	'
Additional term of lease renewal	'	'10 years	'	'	'	'	'
Landlord reimbursements	'	12.8	'	'	'	'	'
Letters of credit and bank guarantees outstanding	'	3.9	3.7	'	'	'	'
Bank guarantees outstanding collateralized	'	1	1.2	'	'	'	'
Ceiling percentage of revenue for major customer	'	10.00%	'	'	6.00%	7.00%	'
Loss contingency accrual	'	'	'	'	'	'	$0.30

Commitments_And_Contingencies_2

Commitments And Contingencies (Future Minimum Lease Payments) (Details) (USD $)	Sep. 30, 2013
In Thousands, unless otherwise specified
Commitments and Contingencies Disclosure [Abstract]	'
2013	$40,870
2014	35,580
2015	28,165
2016	22,463
2017	18,972
Thereafter	52,762
Total minimum lease payments	$198,812

Stockholders_Equity_Details

Stockholders' Equity (Details) (USD $)	12 Months Ended
Share data in Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Class of Stock [Line Items]	'	'	'
Preferred stock, shares authorized	5,000	5,000	'
Common stock, shares authorized	500,000	500,000	'
Stock authorized to repurchase	$100,000,000	'	'
Repurchases of common stock, shares	3,053	1,553	2,649
Repurchases of common stock, value	$74,871,000	$34,953,000	$54,921,000
Series A Junior Participating Preferred Stock [Member]	'	'	'
Class of Stock [Line Items]	'	'	'
Preferred stock, shares authorized	500	'	'

Equity_Incentive_Plan_Narrativ

Equity Incentive Plan (Narrative) (Details) (USD $)	12 Months Ended
In Millions, except Per Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Common stock issuable per restricted stock unit	1	'	'
Total unrecognized compensation cost	$60	'	'
Weighted average remaining recognition period, in months	'12 months	'	'
Common stock were available for grant under the 2000 plan	6.7	'	'
Common stock were reserved for issuance	5.3	'	'
Shares retained by company to cover tax withholdings	0.7	0.9	1
Employee tax withholdings	$15	$21	$22.50
Directors And Executive Officers [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Pre-vesting forfeiture rate	0.00%	'	'
Vice President [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Pre-vesting forfeiture rate	4.00%	'	'
Other Employees [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Pre-vesting forfeiture rate	7.00%	'	'
Restricted Shares and Restricted Stock Units [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Weighted average fair value per share	$22.87	$20.16	$21.91
Restricted Stock Units [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Weighted average fair value per share	$22.87	'	'

Equity_Incentive_Plan_Total_St

Equity Incentive Plan (Total Stock Based Compensation Expense) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'
Total stock-based compensation expense	$48,787	$51,305	$45,402
Cost Of License Revenue [Member]	'	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'
Total stock-based compensation expense	21	22	15
Cost Of Service Revenue [Member]	'	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'
Total stock-based compensation expense	6,134	5,682	5,011
Cost of Support Revenue [Member]	'	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'
Total stock-based compensation expense	3,324	3,234	2,721
Sales And Marketing [Member]	'	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'
Total stock-based compensation expense	11,326	13,809	11,428
Research And Development [Member]	'	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'
Total stock-based compensation expense	8,590	8,761	8,547
General And Administrative [Member]	'	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'
Total stock-based compensation expense	$19,392	$19,797	$17,680

Equity_Incentive_Plan_Restrict

Equity Incentive Plan (Restricted Stock Activity) (Details) (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2013
Restricted Stock [Member]	'
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]	'
Shares, Beginning Balance of outstanding restricted stock	72,000
Shares, Vested	-67,000
Shares, Ending Balance of outstanding restricted stock	5,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]	'
Weighted Average Grant Date Fair Value, Beginning Balance of outstanding restricted stock	$24.49
Weighted Average Grant Date Fair Value, Vested	$24.72
Weighted Average Grant Date Fair Value, Ending Balance of outstanding restricted stock	$21.27
Intrinsic value [Abstract]	'
Aggregate Intrinsic Value, Ending Balance of outstanding restricted stock	$134
Restricted Stock Units [Member]	'
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]	'
Shares, Beginning Balance of outstanding restricted stock	5,134,000
Shares, Granted	2,654,000
Shares, Vested	-2,188,000
Shares, Forfeited or not earned	-414,000
Shares, Ending Balance of outstanding restricted stock	5,186,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]	'
Weighted Average Grant Date Fair Value, Beginning Balance of outstanding restricted stock	$19.99
Weighted Average Grant Date Fair Value, Granted	$22.87
Weighted Average Grant Date Fair Value, Vested	$19.26
Weighted Average Grant Date Fair Value, Forfeited or not earned	$21.26
Weighted Average Grant Date Fair Value, Ending Balance of outstanding restricted stock	$21.67
Intrinsic value [Abstract]	'
Aggregate Intrinsic Value, Ending Balance of outstanding restricted stock	$147,684

Equity_Incentive_Plan_Restrict1

Equity Incentive Plan (Restricted Stock And Restricted Stock Unit Grants) (Details) (Restricted Stock Units [Member])	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2013		Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013
		Performance-based Award [Member]		Performance-based Award [Member]	Performance-based Award [Member]	Time-based Award [Member]
				Vest on Later of November 15, 2012 and Date Specified by Compensation Committee [Member]	Later Of November 15, 2012 Or The Date Determined By Compensation Committee November 15, 2013 And November 15, 2014 [Member]	installment
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'		'	'	'
Shares, Granted	2,654,000	422,000	[1]	200,000	200,000	2,232,000	[2]
Number of equal annual installments	'	'		'	'	3
[1]	Of these performance-based RSUs, the performance conditions were achieved for approximately 200 thousand shares, half of which vested in November 2013, with the remainder to vest in two substantially equal installments in NovemberB 2014 and 2015. The remaining approximately 200 thousand shares will be eligible to vest in two substantially equal installments on the later of NovemberB 15, 2014 and November 15, 2015 and the date the Compensation Committee determines the extent to which performance criteria have been achieved. RSUs not earned for earlier periods are eligible to be earned in 2014 or 2015.
[2]	The time-based RSUs were issued to directors and employees, including some of our executive officers. The time-based RSUs issued to employees and executives will vest in three substantially equal annual installments from the date of grant. Substantially all of the time-based RSUs issued to our directors will vest one year from the date of grant.

Equity_Incentive_Plan_Stock_Op

Equity Incentive Plan (Stock Option Activity) (Details) (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]	'
Shares, Beginning Balance of outstanding	573
Shares, Cancelled	-7
Shares, Exercised	-467
Shares, Ending Balance of outstanding restricted stock	99
Shares, Exercisable	99
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]	'
Weighted Average Exercise Price, Beginning Balance of outstanding stock	$10.36
Weighted Average Exercise Price, Cancelled	$7.56
Weighted Average Exercise Price, Exercised	$10.45
Weighted Average Exercise Price, Ending Balance of outstanding stock	$10.13
Weighted Average Exercise Price, Exercisable	$10.13
Weighted Average Remaining Contractual Term, Ending Balance of outstanding stock	'9 months 26 days
Weighted Average Remaining Contractual Term, Exercisable	'9 months 26 days
Aggregate Intrinsic Value, Ending Balance of outstanding stock	$1,817
Aggregate Intrinsic Value, Exercisable	$1,814

Equity_Incentive_Plan_Value_Of

Equity Incentive Plan (Value Of Stock Option And Stock-Based Award Activity) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Share-based Compensation, Allocation and Classification in Financial Statements [Abstract]	'	'	'
Total intrinsic value of stock options exercised	$6,525	$31,746	$15,983
Total fair value of restricted stock and restricted stock unit awards vested	$48,083	$65,574	$68,772

Employee_Benefit_Plan_Details

Employee Benefit Plan (Details) (Savings Plan [Member], USD $)	12 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Savings Plan [Member]	'	'	'
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]	'	'	'
Defined contribution plan, percentage of employee's contributions matched by employer	50.00%	'	'
Defined contribution plan, percentage of employer contribution on employee's earnings	6.00%	'	'
Defined contribution plan, employers contribution, rate of vesting, percentage	25.00%	'	'
Defined contribution plan, vesting period	'4 years	'	'
Matching contributions by employer	$5	$4.90	$4.40

Pension_Plans_Narrative_Detail

Pension Plans (Narrative) (Details) (USD $)

12 Months Ended

12 Months Ended

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2011

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2011

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2011

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2014

Frozen Plans [Member]

U.S. Plan [Member]

U.S. Plan [Member]

U.S. Plan [Member]

International Plans [Member]

International Plans [Member]

International Plans [Member]

U.S. Plan And The German Co Create Plan [Member]

Other International Plans [Member]

Subsequent Year, Estimated Cost [Member]

Minimum [Member]

Maximum [Member]

Forecast [Member]

Defined Benefit Plan Disclosure [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase

'

'

'

0.00%

0.00%

[1]

0.00%

[1]

0.00%

[1]

3.00%

[1]

3.00%

[1]

3.00%

[1]

'

'

'

'

'

'

Defined benefit plans, vesting period

'

'

'

'

'

'

'

'

'

'

'

'

'

'1 year

'5 years

'

Long-term rate of return

'

'

'

'

7.25%

'

'

5.70%

'

'

'

'

'

'

'

'

Net periodic pension cost

'

'

'

'

$2,013,000

$3,045,000

$2,803,000

$3,517,000

$2,841,000

$2,244,000

'

'

$3,000,000

'

'

'

Actuarial loss expected to be recognized in the following year

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

3,300,000

Current asset allocation target for equity securities

'

'

'

'

'

'

'

'

'

'

60.00%

'

'

'

'

'

Current asset allocation target for fixed income securities

'

'

'

'

'

'

'

'

'

'

40.00%

100.00%

'

'

'

'

Actual return on plan assets gain (loss)

13,600,000

16,500,000

-1,600,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Employer contributions

10,000,000

7,700,000

2,200,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Expected 2013 employer contributions

'

'

'

'

'

'

'

'

'

'

'

'

$12,000,000

'

'

'

[1]

The rate of increase in future compensation is weighted for all plans, ongoing and frozen (with a 0% increase for frozen plans). The weighted rate of increase for ongoing non-U.S. plans was 3% at SeptemberB 30, 2013 and 2012.

Pension_Plans_Accounting_For_T

Pension Plans (Accounting For The Pension Plans) (Details)	12 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2011
Non U S Plans [Member]	'		'		'
Defined Benefit Plan Disclosure [Line Items]	'		'		'
Weighted average assumptions used to determine net periodic pension costs for fiscals years ended September 30, Rate of increase of future compensation	'		'		3.00%
U.S. Plan [Member]	'		'		'
Defined Benefit Plan Disclosure [Line Items]	'		'		'
Weighted average assumptions used to determine benefit obligations at September 30 measurement date, Discount rate	4.90%		4.00%		4.50%
Weighted average assumptions used to determine benefit obligations at September 30 measurement date, Rate of increase in future compensation	0.00%	[1]	0.00%	[1]	0.00%	[1]
Weighted average assumptions used to determine net periodic pension cost for fiscal years ended September 30, Discount rate	4.00%		4.50%		5.00%
Weighted average assumptions used to determine net periodic pension costs for fiscals years ended September 30, Rate of increase of future compensation	0.00%		0.00%		0.00%
Weighted average assumptions used to determine net periodic pension cost for fiscal years ended September 30, Rate of return on plan assets	7.25%		7.25%		7.25%
International Plans [Member]	'		'		'
Defined Benefit Plan Disclosure [Line Items]	'		'		'
Weighted average assumptions used to determine benefit obligations at September 30 measurement date, Discount rate	3.28%		3.40%		4.80%
Weighted average assumptions used to determine benefit obligations at September 30 measurement date, Rate of increase in future compensation	3.00%	[1]	3.00%	[1]	3.00%	[1]
Weighted average assumptions used to determine net periodic pension cost for fiscal years ended September 30, Discount rate	3.38%		4.80%		4.00%
Weighted average assumptions used to determine net periodic pension costs for fiscals years ended September 30, Rate of increase of future compensation	3.00%		3.00%		2.70%
Weighted average assumptions used to determine net periodic pension cost for fiscal years ended September 30, Rate of return on plan assets	5.40%		5.40%		5.60%
Frozen Plans [Member]	'		'		'
Defined Benefit Plan Disclosure [Line Items]	'		'		'
Weighted average assumptions used to determine benefit obligations at September 30 measurement date, Rate of increase in future compensation	0.00%		'		'
[1]	The rate of increase in future compensation is weighted for all plans, ongoing and frozen (with a 0% increase for frozen plans). The weighted rate of increase for ongoing non-U.S. plans was 3% at SeptemberB 30, 2013 and 2012.

Pension_Plans_Components_Of_Ne

Pension Plans (Components Of Net Periodic Pension Cost) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Interest cost of projected benefit obligation	$7,373	$8,044	'
Service cost	2,017	1,882	'
U.S. Plan [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Interest cost of projected benefit obligation	4,989	5,490	5,627
Service cost	0	0	0
Expected return on plan assets	-6,128	-5,412	-5,373
Amortization of prior service cost	0	0	0
Recognized actuarial loss (gain)	3,152	2,967	2,549
Net periodic pension cost	2,013	3,045	2,803
International Plans [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Interest cost of projected benefit obligation	2,384	2,554	2,382
Service cost	2,017	1,882	1,782
Expected return on plan assets	-2,126	-1,929	-2,254
Amortization of prior service cost	-6	-7	0
Recognized actuarial loss (gain)	1,248	341	334
Net periodic pension cost	$3,517	$2,841	$2,244

Pension_Plans_Change_In_Benefi

Pension Plans (Change In Benefit Obligation And Plan Assets) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]	'	'	'
Projected benefit obligationbbeginning of year	$201,109	$179,027	'
Service cost	2,017	1,882	'
Interest cost	7,373	8,044	'
Actuarial loss	-11,302	23,173	'
Foreign exchange impact	629	-2,132	'
Participant contributions	432	421	'
Benefits paid	-10,316	-9,306	'
Plan Amendments	-1,608	0	'
Projected benefit obligationbend of year	188,334	201,109	'
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]	'	'	'
Plan assets at fair value-beginning of year	124,833	110,781	'
Actual return on plan assets	13,610	16,499	'
Employer contributions	9,969	7,666	'
Participant contributions	432	421	'
Foreign exchange impact	-335	-1,228	'
Benefits paid	-10,316	-9,306	'
Plan assets at fair value-end of year	138,193	124,833	'
Underfunded status	-50,141	-76,276	'
Accumulated benefit obligation-end of year	184,891	195,988	'
Non-current liability	-50,141	-76,276	'
Unrecognized actuarial loss	74,357	96,438	'
U.S. Plan [Member]	'	'	'
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]	'	'	'
Projected benefit obligationbbeginning of year	129,701	123,645	'
Service cost	0	0	0
Interest cost	4,989	5,490	5,627
Actuarial loss	-12,728	8,449	'
Foreign exchange impact	0	0	'
Participant contributions	0	0	'
Benefits paid	-8,584	-7,883	'
Plan Amendments	0	0	'
Projected benefit obligationbend of year	113,378	129,701	123,645
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]	'	'	'
Plan assets at fair value-beginning of year	86,016	74,367	'
Actual return on plan assets	10,438	13,995	'
Employer contributions	6,961	5,537	'
Participant contributions	0	0	'
Foreign exchange impact	0	0	'
Benefits paid	-8,584	-7,883	'
Plan assets at fair value-end of year	94,831	86,016	74,367
Underfunded status	-18,547	-43,685	'
Accumulated benefit obligation-end of year	113,378	129,701	'
Non-current liability	-18,547	-43,685	'
Unrecognized actuarial loss	55,180	75,370	'
International Plans [Member]	'	'	'
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]	'	'	'
Projected benefit obligationbbeginning of year	71,408	55,382	'
Service cost	2,017	1,882	1,782
Interest cost	2,384	2,554	2,382
Actuarial loss	1,426	14,724	'
Foreign exchange impact	629	-2,132	'
Participant contributions	432	421	'
Benefits paid	-1,732	-1,423	'
Plan Amendments	-1,608	0	'
Projected benefit obligationbend of year	74,956	71,408	55,382
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]	'	'	'
Plan assets at fair value-beginning of year	38,817	36,414	'
Actual return on plan assets	3,172	2,504	'
Employer contributions	3,008	2,129	'
Participant contributions	432	421	'
Foreign exchange impact	-335	-1,228	'
Benefits paid	-1,732	-1,423	'
Plan assets at fair value-end of year	43,362	38,817	36,414
Underfunded status	-31,594	-32,591	'
Accumulated benefit obligation-end of year	71,513	66,287	'
Non-current liability	-31,594	-32,591	'
Unrecognized actuarial loss	$19,177	$21,068	'

Pension_Plans_Percentage_Of_To

Pension Plans (Percentage Of Total Plan Assets) (Details)	Sep. 30, 2013	Sep. 30, 2012
U.S. Plan [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Equity securities	100.00%	100.00%
International Plans [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Equity securities	100.00%	100.00%
Equity Securities [Member] | U.S. Plan [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Equity securities	62.00%	65.00%
Equity Securities [Member] | International Plans [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Equity securities	51.00%	46.00%
Fixed Income Securities [Member] | U.S. Plan [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Equity securities	38.00%	33.00%
Fixed Income Securities [Member] | International Plans [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Equity securities	27.00%	27.00%
Insurance Company [Member] | U.S. Plan [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Insurance company	0.00%	0.00%
Insurance Company [Member] | International Plans [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Insurance company	19.00%	25.00%
Cash [Member] | U.S. Plan [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Equity securities	0.00%	2.00%
Cash [Member] | International Plans [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Equity securities	3.00%	2.00%

Pension_Plans_Expected_Future_

Pension Plans (Expected Future Benefit Payments) (Details) (USD $)	Sep. 30, 2012
In Thousands, unless otherwise specified
Defined Benefit Plan Disclosure [Line Items]	'
2013	$6,625
2014	7,071
2015	7,645
2016	8,281
2017	9,147
2018 to 2022	59,335
U.S. Plan [Member]	'
Defined Benefit Plan Disclosure [Line Items]	'
2013	4,898
2014	5,286
2015	5,698
2016	6,141
2017	6,633
2018 to 2022	40,715
International Plans [Member]	'
Defined Benefit Plan Disclosure [Line Items]	'
2013	1,727
2014	1,785
2015	1,947
2016	2,140
2017	2,514
2018 to 2022	$18,620

Pension_Plans_Fair_Value_Of_Pl

Pension Plans (Fair Value Of Plan Assets) (Details) (USD $)	Sep. 30, 2013		Sep. 30, 2012	Sep. 30, 2011
In Thousands, unless otherwise specified
Fair Value of Plan Assets [Line Items]	'		'	'
Fair value of plan assets	$138,193		$124,833	$110,781
U.S. Plan Assets Common Collective Trusts [Member]	'		'	'
Fair Value of Plan Assets [Line Items]	'		'	'
Fair value of plan assets	94,831		'	'
International Plan Assets [Member]	'		'	'
Fair Value of Plan Assets [Line Items]	'		'	'
Fair value of plan assets	43,362		'	'
U.S. Treasury, Agency And Other Local Government And Non-Corporate [Member] | U.S. Plan Assets Common Collective Trusts [Member]	'		'	'
Fair Value of Plan Assets [Line Items]	'		'	'
Fair value of plan assets	15,690		'	'
Mortgage-Backed [Member] | U.S. Plan Assets Common Collective Trusts [Member]	'		'	'
Fair Value of Plan Assets [Line Items]	'		'	'
Fair value of plan assets	10,179		'	'
Corporate Investment Grade [Member] | U.S. Plan Assets Common Collective Trusts [Member]	'		'	'
Fair Value of Plan Assets [Line Items]	'		'	'
Fair value of plan assets	9,254		'	'
Corporate High Yield [Member] | U.S. Plan Assets Common Collective Trusts [Member]	'		'	'
Fair Value of Plan Assets [Line Items]	'		'	'
Fair value of plan assets	941		'	'
Large Capitalization Stocks [Member] | U.S. Plan Assets Common Collective Trusts [Member]	'		'	'
Fair Value of Plan Assets [Line Items]	'		'	'
Fair value of plan assets	37,567		'	'
Small Capitalization Stocks [Member] | U.S. Plan Assets Common Collective Trusts [Member]	'		'	'
Fair Value of Plan Assets [Line Items]	'		'	'
Fair value of plan assets	9,553		'	'
U.S. Real Estate Investment Trusts [Member] | U.S. Plan Assets Common Collective Trusts [Member]	'		'	'
Fair Value of Plan Assets [Line Items]	'		'	'
Fair value of plan assets	77		'	'
Large/Mid Capitalization Stocks [Member] | U.S. Plan Assets Common Collective Trusts [Member]	'		'	'
Fair Value of Plan Assets [Line Items]	'		'	'
Fair value of plan assets	11,294		'	'
Small Capitalization Stocks [Member] | U.S. Plan Assets Common Collective Trusts [Member]	'		'	'
Fair Value of Plan Assets [Line Items]	'		'	'
Fair value of plan assets	110		'	'
Emerging Large/Mid Capitalization Stocks [Member] | U.S. Plan Assets Common Collective Trusts [Member]	'		'	'
Fair Value of Plan Assets [Line Items]	'		'	'
Fair value of plan assets	83		'	'
Commodities [Member] | U.S. Plan Assets Common Collective Trusts [Member]	'		'	'
Fair Value of Plan Assets [Line Items]	'		'	'
Fair value of plan assets	83		'	'
Government [Member] | International Plan Assets [Member]	'		'	'
Fair Value of Plan Assets [Line Items]	'		'	'
Fair value of plan assets	6,455		'	'
Europe Corporate Investment Grade [Member] | International Plan Assets [Member]	'		'	'
Fair Value of Plan Assets [Line Items]	'		'	'
Fair value of plan assets	5,390		'	'
Europe Large Capitalization Stocks [Member] | International Plan Assets [Member]	'		'	'
Fair Value of Plan Assets [Line Items]	'		'	'
Fair value of plan assets	21,952		'	'
Insurance Company Funds [Member] | International Plan Assets [Member]	'		'	'
Fair Value of Plan Assets [Line Items]	'		'	'
Fair value of plan assets	8,429	[1]	'	'
Cash [Member] | International Plan Assets [Member]	'		'	'
Fair Value of Plan Assets [Line Items]	'		'	'
Fair value of plan assets	1,136		'	'
Level 1 [Member] | U.S. Plan Assets Common Collective Trusts [Member]	'		'	'
Fair Value of Plan Assets [Line Items]	'		'	'
Fair value of plan assets	0		'	'
Level 1 [Member] | International Plan Assets [Member]	'		'	'
Fair Value of Plan Assets [Line Items]	'		'	'
Fair value of plan assets	34,933		'	'
Level 1 [Member] | U.S. Treasury, Agency And Other Local Government And Non-Corporate [Member] | U.S. Plan Assets Common Collective Trusts [Member]	'		'	'
Fair Value of Plan Assets [Line Items]	'		'	'
Fair value of plan assets	0		'	'
Level 1 [Member] | Mortgage-Backed [Member] | U.S. Plan Assets Common Collective Trusts [Member]	'		'	'
Fair Value of Plan Assets [Line Items]	'		'	'
Fair value of plan assets	0		'	'
Level 1 [Member] | Corporate Investment Grade [Member] | U.S. Plan Assets Common Collective Trusts [Member]	'		'	'
Fair Value of Plan Assets [Line Items]	'		'	'
Fair value of plan assets	0		'	'
Level 1 [Member] | Corporate High Yield [Member] | U.S. Plan Assets Common Collective Trusts [Member]	'		'	'
Fair Value of Plan Assets [Line Items]	'		'	'
Fair value of plan assets	0		'	'
Level 1 [Member] | Large Capitalization Stocks [Member] | U.S. Plan Assets Common Collective Trusts [Member]	'		'	'
Fair Value of Plan Assets [Line Items]	'		'	'
Fair value of plan assets	0		'	'
Level 1 [Member] | Small Capitalization Stocks [Member] | U.S. Plan Assets Common Collective Trusts [Member]	'		'	'
Fair Value of Plan Assets [Line Items]	'		'	'
Fair value of plan assets	0		'	'
Level 1 [Member] | U.S. Real Estate Investment Trusts [Member] | U.S. Plan Assets Common Collective Trusts [Member]	'		'	'
Fair Value of Plan Assets [Line Items]	'		'	'
Fair value of plan assets	0		'	'
Level 1 [Member] | Large/Mid Capitalization Stocks [Member] | U.S. Plan Assets Common Collective Trusts [Member]	'		'	'
Fair Value of Plan Assets [Line Items]	'		'	'
Fair value of plan assets	0		'	'
Level 1 [Member] | Small Capitalization Stocks [Member] | U.S. Plan Assets Common Collective Trusts [Member]	'		'	'
Fair Value of Plan Assets [Line Items]	'		'	'
Fair value of plan assets	0		'	'
Level 1 [Member] | Emerging Large/Mid Capitalization Stocks [Member] | U.S. Plan Assets Common Collective Trusts [Member]	'		'	'
Fair Value of Plan Assets [Line Items]	'		'	'
Fair value of plan assets	0		'	'
Level 1 [Member] | Commodities [Member] | U.S. Plan Assets Common Collective Trusts [Member]	'		'	'
Fair Value of Plan Assets [Line Items]	'		'	'
Fair value of plan assets	0		'	'
Level 1 [Member] | Government [Member] | International Plan Assets [Member]	'		'	'
Fair Value of Plan Assets [Line Items]	'		'	'
Fair value of plan assets	6,455		'	'
Level 1 [Member] | Europe Corporate Investment Grade [Member] | International Plan Assets [Member]	'		'	'
Fair Value of Plan Assets [Line Items]	'		'	'
Fair value of plan assets	5,390		'	'
Level 1 [Member] | Europe Large Capitalization Stocks [Member] | International Plan Assets [Member]	'		'	'
Fair Value of Plan Assets [Line Items]	'		'	'
Fair value of plan assets	21,952		'	'
Level 1 [Member] | Insurance Company Funds [Member] | International Plan Assets [Member]	'		'	'
Fair Value of Plan Assets [Line Items]	'		'	'
Fair value of plan assets	0	[1]	'	'
Level 1 [Member] | Cash [Member] | International Plan Assets [Member]	'		'	'
Fair Value of Plan Assets [Line Items]	'		'	'
Fair value of plan assets	1,136		'	'
Level 2 [Member] | U.S. Plan Assets Common Collective Trusts [Member]	'		'	'
Fair Value of Plan Assets [Line Items]	'		'	'
Fair value of plan assets	94,831		'	'
Level 2 [Member] | International Plan Assets [Member]	'		'	'
Fair Value of Plan Assets [Line Items]	'		'	'
Fair value of plan assets	8,429		'	'
Level 2 [Member] | U.S. Treasury, Agency And Other Local Government And Non-Corporate [Member] | U.S. Plan Assets Common Collective Trusts [Member]	'		'	'
Fair Value of Plan Assets [Line Items]	'		'	'
Fair value of plan assets	15,690		'	'
Level 2 [Member] | Mortgage-Backed [Member] | U.S. Plan Assets Common Collective Trusts [Member]	'		'	'
Fair Value of Plan Assets [Line Items]	'		'	'
Fair value of plan assets	10,179		'	'
Level 2 [Member] | Corporate Investment Grade [Member] | U.S. Plan Assets Common Collective Trusts [Member]	'		'	'
Fair Value of Plan Assets [Line Items]	'		'	'
Fair value of plan assets	9,254		'	'
Level 2 [Member] | Corporate High Yield [Member] | U.S. Plan Assets Common Collective Trusts [Member]	'		'	'
Fair Value of Plan Assets [Line Items]	'		'	'
Fair value of plan assets	941		'	'
Level 2 [Member] | Large Capitalization Stocks [Member] | U.S. Plan Assets Common Collective Trusts [Member]	'		'	'
Fair Value of Plan Assets [Line Items]	'		'	'
Fair value of plan assets	37,567		'	'
Level 2 [Member] | Small Capitalization Stocks [Member] | U.S. Plan Assets Common Collective Trusts [Member]	'		'	'
Fair Value of Plan Assets [Line Items]	'		'	'
Fair value of plan assets	9,553		'	'
Level 2 [Member] | U.S. Real Estate Investment Trusts [Member] | U.S. Plan Assets Common Collective Trusts [Member]	'		'	'
Fair Value of Plan Assets [Line Items]	'		'	'
Fair value of plan assets	77		'	'
Level 2 [Member] | Large/Mid Capitalization Stocks [Member] | U.S. Plan Assets Common Collective Trusts [Member]	'		'	'
Fair Value of Plan Assets [Line Items]	'		'	'
Fair value of plan assets	11,294		'	'
Level 2 [Member] | Small Capitalization Stocks [Member] | U.S. Plan Assets Common Collective Trusts [Member]	'		'	'
Fair Value of Plan Assets [Line Items]	'		'	'
Fair value of plan assets	110		'	'
Level 2 [Member] | Emerging Large/Mid Capitalization Stocks [Member] | U.S. Plan Assets Common Collective Trusts [Member]	'		'	'
Fair Value of Plan Assets [Line Items]	'		'	'
Fair value of plan assets	83		'	'
Level 2 [Member] | Commodities [Member] | U.S. Plan Assets Common Collective Trusts [Member]	'		'	'
Fair Value of Plan Assets [Line Items]	'		'	'
Fair value of plan assets	83		'	'
Level 2 [Member] | Government [Member] | International Plan Assets [Member]	'		'	'
Fair Value of Plan Assets [Line Items]	'		'	'
Fair value of plan assets	0		'	'
Level 2 [Member] | Europe Corporate Investment Grade [Member] | International Plan Assets [Member]	'		'	'
Fair Value of Plan Assets [Line Items]	'		'	'
Fair value of plan assets	0		'	'
Level 2 [Member] | Europe Large Capitalization Stocks [Member] | International Plan Assets [Member]	'		'	'
Fair Value of Plan Assets [Line Items]	'		'	'
Fair value of plan assets	0		'	'
Level 2 [Member] | Insurance Company Funds [Member] | International Plan Assets [Member]	'		'	'
Fair Value of Plan Assets [Line Items]	'		'	'
Fair value of plan assets	8,429	[1]	'	'
Level 2 [Member] | Cash [Member] | International Plan Assets [Member]	'		'	'
Fair Value of Plan Assets [Line Items]	'		'	'
Fair value of plan assets	0		'	'
Level 3 [Member] | U.S. Plan Assets Common Collective Trusts [Member]	'		'	'
Fair Value of Plan Assets [Line Items]	'		'	'
Fair value of plan assets	0		'	'
Level 3 [Member] | International Plan Assets [Member]	'		'	'
Fair Value of Plan Assets [Line Items]	'		'	'
Fair value of plan assets	0		'	'
Level 3 [Member] | U.S. Treasury, Agency And Other Local Government And Non-Corporate [Member] | U.S. Plan Assets Common Collective Trusts [Member]	'		'	'
Fair Value of Plan Assets [Line Items]	'		'	'
Fair value of plan assets	0		'	'
Level 3 [Member] | Mortgage-Backed [Member] | U.S. Plan Assets Common Collective Trusts [Member]	'		'	'
Fair Value of Plan Assets [Line Items]	'		'	'
Fair value of plan assets	0		'	'
Level 3 [Member] | Corporate Investment Grade [Member] | U.S. Plan Assets Common Collective Trusts [Member]	'		'	'
Fair Value of Plan Assets [Line Items]	'		'	'
Fair value of plan assets	0		'	'
Level 3 [Member] | Corporate High Yield [Member] | U.S. Plan Assets Common Collective Trusts [Member]	'		'	'
Fair Value of Plan Assets [Line Items]	'		'	'
Fair value of plan assets	0		'	'
Level 3 [Member] | Large Capitalization Stocks [Member] | U.S. Plan Assets Common Collective Trusts [Member]	'		'	'
Fair Value of Plan Assets [Line Items]	'		'	'
Fair value of plan assets	0		'	'
Level 3 [Member] | Small Capitalization Stocks [Member] | U.S. Plan Assets Common Collective Trusts [Member]	'		'	'
Fair Value of Plan Assets [Line Items]	'		'	'
Fair value of plan assets	0		'	'
Level 3 [Member] | U.S. Real Estate Investment Trusts [Member] | U.S. Plan Assets Common Collective Trusts [Member]	'		'	'
Fair Value of Plan Assets [Line Items]	'		'	'
Fair value of plan assets	0		'	'
Level 3 [Member] | Large/Mid Capitalization Stocks [Member] | U.S. Plan Assets Common Collective Trusts [Member]	'		'	'
Fair Value of Plan Assets [Line Items]	'		'	'
Fair value of plan assets	0		'	'
Level 3 [Member] | Small Capitalization Stocks [Member] | U.S. Plan Assets Common Collective Trusts [Member]	'		'	'
Fair Value of Plan Assets [Line Items]	'		'	'
Fair value of plan assets	0		'	'
Level 3 [Member] | Emerging Large/Mid Capitalization Stocks [Member] | U.S. Plan Assets Common Collective Trusts [Member]	'		'	'
Fair Value of Plan Assets [Line Items]	'		'	'
Fair value of plan assets	0		'	'
Level 3 [Member] | Commodities [Member] | U.S. Plan Assets Common Collective Trusts [Member]	'		'	'
Fair Value of Plan Assets [Line Items]	'		'	'
Fair value of plan assets	0		'	'
Level 3 [Member] | Government [Member] | International Plan Assets [Member]	'		'	'
Fair Value of Plan Assets [Line Items]	'		'	'
Fair value of plan assets	0		'	'
Level 3 [Member] | Europe Corporate Investment Grade [Member] | International Plan Assets [Member]	'		'	'
Fair Value of Plan Assets [Line Items]	'		'	'
Fair value of plan assets	0		'	'
Level 3 [Member] | Europe Large Capitalization Stocks [Member] | International Plan Assets [Member]	'		'	'
Fair Value of Plan Assets [Line Items]	'		'	'
Fair value of plan assets	0		'	'
Level 3 [Member] | Insurance Company Funds [Member] | International Plan Assets [Member]	'		'	'
Fair Value of Plan Assets [Line Items]	'		'	'
Fair value of plan assets	0	[1]	'	'
Level 3 [Member] | Cash [Member] | International Plan Assets [Member]	'		'	'
Fair Value of Plan Assets [Line Items]	'		'	'
Fair value of plan assets	$0		'	'
[1]	These investments are comprised primarily of funds invested with an insurance company in Japan with a guaranteed rate of return. The insurance company invests these assets primarily in government and corporate bonds.

Segment_Information_Revenue_An

Segment Information (Revenue And Operating Income) (Details) (USD $)	3 Months Ended	12 Months Ended
	Jan. 01, 2011	Sep. 30, 2013	Sep. 30, 2012		Sep. 30, 2011
Revenue	'	$1,293,541,000	$1,255,679,000		$1,166,949,000
Operating income	'	127,324,000	128,096,000		117,114,000
Sales and marketing expenses	'	378,771,000	-392,956,000	[1]	-353,051,000	[1]
General and administrative expenses	'	136,999,000	-119,085,000	[1]	-110,291,000	[1]
Other income (expense), net	'	-1,090,000	-7,360,000		-12,566,000
Income before income taxes	'	126,234,000	120,736,000		104,548,000
Restructuring charges	'	52,197,000	24,928,000		0
Depreciation and amortization	'	76,551,000	66,471,000		62,394,000
Software Products [Member]	'	'	'		'
Revenue	'	977,523,000	935,472,000		875,511,000
Operating income	'	605,963,000	598,344,000	[1]	557,879,000	[1]
Restructuring charges	'	17,700,000	4,100,000		'
Depreciation and amortization	'	27,300,000	25,400,000		24,800,000
Services [Member]	'	'	'		'
Revenue	'	316,018,000	320,207,000		291,438,000
Operating income	'	37,131,000	41,793,000	[1],[2]	22,577,000	[1],[2]
Restructuring charges	'	11,300,000	4,000,000		'
Depreciation and amortization	'	5,000,000	3,600,000		3,800,000
Expected cost exceeding revenue in automotive contract	5,000,000	'	'		'
Estimated loss on automotive contract	5,000,000	'	'		'
Reduction of service margin percentage	2.00%	'	'		'
Restructuring Charges [Member]	'	'	'		'
Restructuring charges	'	-251,000	'		'
General And Administrative [Member]	'	'	'		'
Restructuring charges	'	5,100,000	1,600,000		'
Sales And Marketing [Member]	'	'	'		'
Restructuring charges	'	$18,100,000	$15,200,000		'
[1]	We recorded restructuring charges of $24.9 million in 2012. Software Products included $4.1 million; Services included $4.0 million; sales and marketing expenses included $15.2 million; and general and administrative expenses included $1.6 million of the total restructuring charges recorded in 2012.
[2]	In the first quarter of 2011, we made a strategic decision to enter into a contract with a customer in the automotive industry, for which we expected our costs to exceed our revenue by approximately $5 million. Services segment operating income in 2011 included immediate recognition of the approximately $5 million estimated loss on this contract and resulted in a reduction of service margins by approximately 2%.

Segment_Information_Revenue_By

Segment Information (Revenue By Product Segment) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Revenue	$1,293,541	$1,255,679	$1,166,949
CAD [Member]	'	'	'
Revenue	552,510	573,457	587,824
Extended PLM [Member]	'	'	'
Revenue	572,313	604,339	503,128
SLM [Member]	'	'	'
Revenue	$168,718	$77,883	$75,997

Segment_Information_Revenue_By1

Segment Information (Revenue By Geographic Segment) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2011
Revenue	$1,293,541		$1,255,679		$1,166,949
Total long-lived intangible assets	64,652		63,466		62,569
Americas [Member]	'		'		'
Revenue	522,788		479,932	[1]	429,213	[1]
Total long-lived intangible assets	49,788	[2]	46,083	[2]	42,767	[2]
Europe [Member]	'		'		'
Revenue	479,877		480,287	[3]	466,540	[3]
Total long-lived intangible assets	5,557		6,649		6,989
Pacific Rim [Member]	'		'		'
Revenue	161,587		160,834		147,992
Japan [Member]	'		'		'
Revenue	129,289		134,626		123,204
Asia Pacific Member	'		'		'
Total long-lived intangible assets	9,307		10,734		12,813
United States [Member]	'		'		'
Revenue	485,200		453,200		408,000
Germany [Member]	'		'		'
Revenue	$167,200		$188,300		$173,300
[1]	Includes revenue in the United States totaling $485.2 million, $453.2 million and $408.0 million for 2013, 2012 and 2011, respectively.
[2]	Substantially all of the Americas long-lived tangible assets are located in the United States.
[3]	Includes revenue in Germany totaling $167.2 million, $188.3 million and $173.3 million for 2013, 2012 and 2011, respectively.

Segment_Information_Narrative_

Segment Information (Narrative) (Details)	12 Months Ended
	Sep. 30, 2012
	segments
Segment Reporting [Abstract]	'
Number of operating and reportable segments	2

Subsequent_Events_Narrative_De

Subsequent Events (Narrative) (Details) (Restricted Stock Units [Member])	12 Months Ended					0 Months Ended
	Sep. 30, 2013	Sep. 30, 2013		Sep. 30, 2013		Nov. 12, 2013	Nov. 12, 2013	Nov. 12, 2013
		Performance-based Award [Member]		Time-based Award [Member]		Time-based Award [Member]	Later Of November 15, 2013 Or Date Determined By Compensation Committee November 15, 2014 And November 15, 2015 [Member]	Later of November 15 or Date Determined By Compensation Committee, in each of 2013, 2014 and 2015 [Member]
				installment		Subsequent Event [Member]	Performance-based Award [Member]	Performance-based Award [Member]
						installment	Subsequent Event [Member]	Subsequent Event [Member]
								installment
Subsequent Event [Line Items]	'	'		'		'	'	'
Shares granted	2,654,000	422,000	[1]	2,232,000	[2]	'	23,785	316,978
Number of equal annual installments	'	'		3		3	'	3
[1]	Of these performance-based RSUs, the performance conditions were achieved for approximately 200 thousand shares, half of which vested in November 2013, with the remainder to vest in two substantially equal installments in NovemberB 2014 and 2015. The remaining approximately 200 thousand shares will be eligible to vest in two substantially equal installments on the later of NovemberB 15, 2014 and November 15, 2015 and the date the Compensation Committee determines the extent to which performance criteria have been achieved. RSUs not earned for earlier periods are eligible to be earned in 2014 or 2015.
[2]	The time-based RSUs were issued to directors and employees, including some of our executive officers. The time-based RSUs issued to employees and executives will vest in three substantially equal annual installments from the date of grant. Substantially all of the time-based RSUs issued to our directors will vest one year from the date of grant.

Subsequent_Events_Schedule_Of_

Subsequent Events (Schedule Of Restricted Units Granted) (Details) (Subsequent Event [Member], Restricted Stock Units [Member], USD $)	0 Months Ended
In Thousands, unless otherwise specified	Nov. 12, 2013
Performance-based Award [Member]	'
Subsequent Event [Line Items]	'
Number Granted	341
Intrinsic Value	$10,959
Time-based Award [Member]	'
Subsequent Event [Line Items]	'
Number Granted	748
Intrinsic Value	$24,060