Towers Watson & Co. 10-Q 5 Feb 15 2015 Q2 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	6 Months Ended
	Dec. 31, 2014	Jan. 30, 2015
Document And Entity Information [Abstract]
Document Type	10-Q
Document Period End Date	31-Dec-14
Amendment Flag	FALSE
Document Fiscal Period Focus	Q2
Document Fiscal Year Focus	2015
Current Fiscal Year End Date	-24
Entity Central Index Key	1470215
Entity Filer Category	Large Accelerated Filer
Entity Registrant Name	Towers Watson & Co.
Entity Common Stock, Shares Outstanding		69,568,719

Condensed_Consolidated_Stateme

Condensed Consolidated Statements of Operations (USD $)	3 Months Ended		6 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Income Statement [Abstract]
Revenue	$957,922	$888,155	$1,836,029	$1,698,094
Costs of providing services:
Salaries and employee benefits	556,319	526,731	1,089,847	1,027,150
Professional and subcontracted services	71,630	69,074	133,835	130,474
Occupancy	36,756	34,782	72,829	68,327
General and administrative expenses	82,100	85,038	157,534	153,807
Depreciation and amortization	44,107	43,296	88,976	86,681
Transaction and integration expenses	0	808	0	808
Cost of Services	790,912	759,729	1,543,021	1,467,247
Income from operations	167,010	128,426	293,008	230,847
Interest income	894	560	1,957	1,089
Interest expense	-2,186	-2,027	-4,514	-4,463
Other non-operating income	34	5,652	865	5,690
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	165,752	132,611	291,316	233,163
Provision for income taxes	55,372	42,283	99,434	57,091
INCOME FROM CONTINUING OPERATIONS	110,380	90,328	191,882	176,072
(Loss)/income from discontinued operations, net of tax of $0, $38,286, $0, and $40,837	0	-403	0	2,041
NET INCOME BEFORE NON-CONTROLLING INTERESTS	110,380	89,925	191,882	178,113
Less: Income attributable to non-controlling interests	204	3,737	148	3,711
NET INCOME (attributable to common stockholders)	$110,176	$86,188	$191,734	$174,402
Basic earnings per share (attributable to common stockholders):
Income from continuing operations (in dollars per share)	$1.58	$1.22	$2.74	$2.43
Income from discontinued operations (in dollars per share)	$0	$0	$0	$0.03
Net income (in dollars per share)	$1.58	$1.22	$2.74	$2.46
Diluted earnings per share (attributable to common stockholders):
Income from continuing operations (in dollars per share)	$1.57	$1.21	$2.72	$2.42
Income from discontinued operations (in dollars per share)	$0	$0	$0	$0.03
Net income (in dollars per share)	$1.57	$1.21	$2.72	$2.45
Dividends declared per share (in dollars per share)	$0.15	$0.14	$0.30	$0.14
Weighted average shares of common stock, basic (in shares)	69,875	70,809	70,029	70,805
Weighted average shares of common stock, diluted (in shares)	70,262	71,213	70,429	71,130

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements of Operations (Parenthetical) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Income Statement [Abstract]
Discontinued operations, tax provision	$0	$38,286	$0	$40,837

Condensed_Consolidated_Stateme2

Condensed Consolidated Statements of Comprehensive Income (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income before non-controlling interests	$110,380	$89,925	$191,882	$178,113
Other comprehensive (loss)/income, net of tax:
Foreign currency translation	-79,502	17,825	-184,833	88,735
Defined pension and post-retirement benefit costs	2,844	3,419	5,719	6,531
Hedge effectiveness	92	-12	898	-1,030
Available-for-sale securities	-107	36	-235	222
Other comprehensive (loss)/income before non-controlling interests	-76,673	21,268	-178,451	94,458
Comprehensive income before non-controlling interests	33,707	111,193	13,431	272,571
Comprehensive (loss)/income attributable to non-controlling interest	-288	3,321	-399	3,097
Comprehensive income (attributable to common stockholders)	$33,995	$107,872	$13,830	$269,474

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (USD $)	Dec. 31, 2014	Jun. 30, 2014
In Thousands, unless otherwise specified
Assets
Cash and cash equivalents	$621,391	$727,849
Fiduciary assets	19,793	12,010
Short-term investments	45,438	122,761
Receivables from clients:
Billed, net of allowances of $9,977 and $8,075	539,738	507,213
Unbilled, at estimated net realizable value	308,243	314,020
Current receivables, net	847,981	821,233
Other current assets	126,833	124,645
Total current assets	1,661,436	1,808,498
Fixed assets, net	375,210	374,444
Deferred income taxes	63,439	79,103
Goodwill	2,192,431	2,313,058
Intangible assets, net	604,518	657,293
Other assets	439,852	395,390
Total Assets	5,336,886	5,627,786
Liabilities
Accounts payable, accrued liabilities and deferred income	378,502	404,760
Employee-related liabilities	386,450	518,532
Fiduciary liabilities	19,793	12,010
Term loan - current	25,000	25,000
Other current liabilities	39,996	74,297
Total current liabilities	849,741	1,034,599
Revolving credit facility	50,000	0
Term loan	187,500	200,000
Accrued retirement benefits and other employee-related liabilities	699,857	768,024
Professional liability claims reserve	235,554	225,959
Other noncurrent liabilities	271,008	288,255
Total Liabilities	2,293,660	2,516,837
Commitments and contingencies
Stockholders’ Equity
Additional paid-in capital	1,865,888	1,849,119
Treasury stock, at cost — 4,852,724 and 4,213,770 shares	-362,989	-286,182
Retained earnings	1,893,545	1,722,927
Accumulated other comprehensive loss	-367,606	-189,702
Total Stockholders’ Equity	3,029,584	3,096,908
Non-controlling interest	13,642	14,041
Total Equity	3,043,226	3,110,949
Total Liabilities and Total Equity	5,336,886	5,627,786
Class A Common Stock [Member]
Stockholders’ Equity
Class A Common Stock — $0.01 par value: 300,000,000 shares authorized; 74,552,661 issued and 69,699,937 and 70,338,891 outstanding	$746	$746

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheets (Parentheticals) (USD $)	Dec. 31, 2014	Jun. 30, 2014
In Thousands, except Share data, unless otherwise specified
Allowance for doubtful accounts receivable, current	$9,977	$8,075
Treasury stock, shares	4,852,724	4,213,770
Common Class A [Member]
Common stock, par value (in dollars per share)	$0.01	$0.01
Common stock, shares authorized	300,000,000	300,000,000
Common stock, shares issued	74,552,661	74,552,661
Common stock, shares outstanding	69,699,937	70,338,891

Condensed_Consolidated_Stateme3

Condensed Consolidated Statements of Cash Flows (USD $)	6 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Cash flows from/(used in) operating activities:
Net income before non-controlling interests	$191,882	$178,113
Adjustments to reconcile net income to net cash from/(used in) operating activities:
Provision for doubtful receivables from clients	11,157	566
Depreciation	54,160	49,097
Amortization of intangible assets	34,816	38,022
Gain on sale of discontinued operations, pretax	0	-18,480
Provision for deferred income taxes	24,569	51,276
Stock-based compensation	18,414	11,509
Other, net	535	-1,619
Changes in operating assets and liabilities
Receivables from clients	-76,970	47,340
Fiduciary assets	-7,783	110,743
Other current assets	-15,117	-858
Other noncurrent assets	717	-5,139
Accounts payable, accrued liabilities and deferred income	-31,885	-44,160
Employee-related liabilities	-104,651	-224,683
Fiduciary liabilities	7,783	-110,743
Accrued retirement benefits and other employee-related liabilities	-78,919	-104,386
Professional liability claims reserves	15,427	2,887
Other current liabilities	14,682	-762
Other noncurrent liabilities	-18,528	-256
Income tax related accounts	-38,389	1,599
Cash flows from/(used) in operating activities	1,900	-19,934
Cash flows from/(used in) investing activities:
Cash paid for business acquisitions	-1,255	-210,814
Cash transferred with discontinued operations	0	-25,066
Proceeds from discontinued operations	0	256,953
Cash acquired from business acquisitions	0	3,949
Fixed assets and software for internal use	-33,113	-38,566
Capitalized software costs	-33,507	-23,327
Purchases of investments of consolidated variable interest entity	0	-50,510
Purchases of held-to-maturity investments	-155,927	0
Redemptions of held-to-maturity investments	214,510	0
Purchases of available-for-sale securities	-1,677	-31,779
Sales and redemptions of available-for-sale securities	11,734	56,580
Cash flows from/(used in) investing activities	765	-62,580
Cash flows (used in)/from financing activities:
Borrowings under credit facility	275,000	144,100
Repayments under credit facility	-225,000	-109,100
Repayments of notes payable	-12,500	-12,500
Cash received from consolidated variable interest entity	0	50,510
Contingent retention liability	0	21,746
Cash paid on retention liability	-10,338	-1,939
Dividends paid	-20,204	-613
Repurchases of common stock	-81,410	-40,533
Payroll tax payments on vested shares	-10,833	-7,457
Excess tax benefits	4,618	9,800
Cash flows (used in)/from financing activities	-80,667	54,014
Effect of exchange rates on cash	-28,456	7,638
Decrease in cash and cash equivalents	-106,458	-20,862
Cash and cash equivalents at beginning of period	727,849	532,805
Cash and cash equivalents at end of period	621,391	511,943
Supplemental disclosures:
Cash paid for interest	1,956	1,931
Cash paid for income taxes, net of refunds	104,927	40,814
Transfers into consolidated investment funds	$0	$223,212

Condensed_Consolidated_Stateme4

Condensed Consolidated Statements of Changes in Stockholders' Equity (USD $)	Total	Additional Paid-in Capital [Member]	Treasury Stock, at cost [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive (Loss) Income [Member]	Noncontrolling Interest [Member]	Common Class A [Member]	Common Class B [Member]
In Thousands, unless otherwise specified							Common Stock [Member]	Common Stock [Member]
Balance as of at Jun. 30, 2013	$2,744,834	$1,850,448	($221,643)	$1,394,407	($299,464)	$20,340	$692	$54
Shares outstanding as of at Jun. 30, 2013							69,178	5,374
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	178,113			174,402		3,711
Other comprehensive income/(loss)	94,458				95,072	-614
Repurchases of common stock	-40,533		-40,533
Shares received for employee taxes upon vesting of restricted stock units	-7,457		-7,457
Exercises of stock options	465	-3,443	3,908
Vesting of restricted stock units, value	-7,200	-24,128	16,928
Acquisitions	420	6,717				-6,297
Redeemable non-controlling interest from consolidated variable interest entity	273,722					273,722
Class A Common Stock:
Cash dividends declared	-10,499			-10,499
Excess tax benefits	9,800	9,800
Stock-based compensation	12,546	12,546
Balance as of at Dec. 31, 2013	3,248,669	1,851,940	-248,797	1,558,310	-204,392	290,862	692	54
Shares outstanding as of at Dec. 31, 2013							69,178	5,374
Balance as of at Jun. 30, 2014	3,110,949	1,849,119	-286,182	1,722,927	-189,702	14,041	746	0
Shares outstanding as of at Jun. 30, 2014							74,552	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	191,882			191,734		148
Other comprehensive income/(loss)	-178,451				-177,904	-547
Repurchases of common stock	-81,410		-81,410
Shares received for employee taxes upon vesting of restricted stock units	-6,675		-6,675
Exercises of stock options	56	-2,298	2,354
Vesting of restricted stock units, value	4,959	-3,965	8,924
Class A Common Stock:
Cash dividends declared	-21,116			-21,116
Excess tax benefits	4,618	4,618
Stock-based compensation	18,414	18,414
Balance as of at Dec. 31, 2014	$3,043,226	$1,865,888	($362,989)	$1,893,545	($367,606)	$13,642	$746	$0
Shares outstanding as of at Dec. 31, 2014							74,552	0

Organization_and_Basis_of_Pres

Organization and Basis of Presentation	6 Months Ended
	Dec. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Basis of Presentation	Organization and Basis of Presentation.
	The accompanying unaudited quarterly condensed consolidated financial statements of Towers Watson & Co. (“Towers Watson”, the “Company” or “we”) and our subsidiaries are presented in accordance with the rules and regulations of the Securities and Exchange Commission (“SEC”) for quarterly reports on Form 10-Q and therefore do not include all of the information and footnotes required by U.S. generally accepted accounting principles (“GAAP”). In the opinion of management, these condensed consolidated financial statements reflect all adjustments, consisting only of normal recurring adjustments, which are necessary for a fair presentation of the condensed consolidated financial statements and results for the interim periods. All intercompany accounts and transactions have been eliminated in consolidation. The condensed consolidated financial statements should be read together with the Towers Watson audited consolidated financial statements and notes thereto contained in the Company’s Annual Report on Form 10-K for the fiscal year ended June 30, 2014, which was filed with the SEC on August 15, 2014, and may be accessed via EDGAR on the SEC’s web site at www.sec.gov. Balance sheet data as of June 30, 2014 was derived from Towers Watson’s audited financial statements.
	Our fiscal year 2015 began July 1, 2014 and ends June 30, 2015.
	The results of operations for the three and six months ended December 31, 2014 are not necessarily indicative of the results that can be expected for the entire fiscal year ending June 30, 2015. The results reflect certain estimates and assumptions made by management including those estimates used in calculating acquisition consideration and fair value of tangible and intangible assets and liabilities, professional liability claims, estimated bonuses, valuation of billed and unbilled receivables, and anticipated tax liabilities that affect the amounts reported in the condensed consolidated financial statements and related notes.
	As discussed further in Note 2 – Acquisitions and Divestitures, we have classified the operating results of our reinsurance and property and casualty insurance brokerage business as discontinued operations for all periods presented in our condensed consolidated statements of operations. This business was sold in November 2013.
	Recent Accounting Pronouncements.
	Not yet adopted
	On May 28, 2014, the Financial Accounting Standards Board ("FASB") and International Accounting Standards Board ("IASB") issued their final standard on revenue from contracts with customers. The standard, issued as Accounting Standards Update ("ASU") 2014-09 by the FASB, outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers, and supersedes most current revenue recognition guidance. The core principle of the revenue model is that an entity recognizes revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The ASU applies to all contracts with customers, except those that are within the scope of other topics in the FASB Accounting Standards Codification. Compared with current U.S. GAAP, the ASU also requires significantly expanded disclosures about revenue recognition. The ASU is effective for interim and annual reporting periods that begin after December 15, 2016, and early adoption is prohibited. The Company is currently evaluating the impact of adopting this provision.
	On June 19, 2014, the FASB issued ASU 2014-12, Accounting for Share-Based Payments When the Terms of an Award Provide a Performance Target Could Be Achieved After the Requisite Service Period. The update is intended to resolve the diverse accounting treatment of these types of awards in practice. The amendments require that a performance target that affects vesting and that could be achieved after the requisite service period be treated as a performance condition. A reporting entity should apply existing guidance in "Compensation - Stock Compensation (Topic 718)" as it relates to awards with performance conditions that affect vesting to account for such awards. As such, the performance target should not be reflected in estimating the grant-date fair value of the award. Compensation cost should be recognized in the period in which it becomes probable that the performance target will be achieved, and should represent the compensation cost attributable to the period(s) for which the requisite service has already been rendered. If the performance target becomes probable of being achieved before the end of the requisite service period, the remaining unrecognized compensation cost should be recognized prospectively over the remaining requisite service period. The ASU is effective for interim and annual reporting periods that begin after December 15, 2015. The Company does not expect the adoption of this pronouncement to have an impact on our financial statements as this guidance mirrors our existing policy for such share-based awards.
	Adopted
	On June 7, 2013, the FASB issued ASU 2013-08, “Financial Services – Investment Companies (Topic 946): Amendments to the Scope, Measurement, and Disclosure Requirements,” which amends the criteria an entity would need to meet to qualify as an investment company under Accounting Standards Codification ("ASC") 946. The ASU (1) introduces new disclosure requirements that apply to all investment companies and, (2) amends the measurement criteria for certain interests in other investment companies. The ASU also amends the requirements in ASC 810 related to qualifying for the “investment-company deferral” in ASU 2010-10, as well as the requirements in ASC 820 related to qualifying for the “net asset value practical expedient” in ASU 2009-12. We manage certain funds that are considered variable interest entities and for which our management fee is considered a variable interest. These funds qualify for the “investment-company deferral” in ASU 2010-10, and therefore are subject to the consolidation guidance prior to the issuance of ASU 2009-17. The ASU is effective for annual periods that begin after December 15, 2013 and interim periods within those annual periods. Early adoption is prohibited. The Company has evaluated whether these funds continued to qualify for the “investment-company deferral” based on the amended investment company criteria proscribed by ASU 2013-08 and concluded that there were no changes to the Company's original assessments. Therefore, there is no impact to the Company's financial statements or disclosures.

Acquisitions_and_Divestitures

Acquisitions and Divestitures	6 Months Ended
	Dec. 31, 2014
Business Combinations [Abstract]
Acquisitions and Divestitures	Acquisitions and Divestitures.
	Acquisitions
	Liazon Corporation Acquisition
	On November 22, 2013, Towers Watson purchased Liazon Corporation (“Liazon”), a business focused on developing and delivering private benefit exchanges for active employees, for $204.3 million in cash and assumed equity awards valued at $8.0 million. See Note 11 for further information on the assumed equity awards. The Liazon business became a new line of business, which complements our existing OneExchange offerings under the Exchange Solutions segment. Together these solutions help organizations, both large and small, deliver self- and fully-insured benefits to both employees as well as pre- and post-65 retirees. We included the results of Liazon's operations since the acquisition date in both the Exchange Solutions segment and in our condensed consolidated financial statements.
	We have recorded the tangible assets received, liabilities assumed, and the fair value of intangibles for Liazon. The intangibles included developed technology, valued at $34.3 million, and other intangibles that were collectively immaterial. Our estimate of fair value for the technology intangible was developed using the multi-period excess earnings method valuation model. Significant assumptions used in the valuation were estimated revenues and expenses, contributory asset charges, required rates of return, and discount rates. We also recorded a net deferred tax asset of $9.2 million. It was determined that total consideration was $212.3 million, and we recorded $172.9 million of goodwill related to the acquisition of Liazon.
	Divestitures
	Sale of our Brokerage business
	On September 19, 2013, we entered into a definitive agreement to sell our Reinsurance and Property and Casualty Insurance Brokerage (“Brokerage”) business to Jardine Lloyd Thompson Group plc (“JLT”) for cash consideration of $250 million. The Brokerage business was a component of our Risk and Financial Services segment. The sale closed during our second quarter of fiscal year 2014. We divested this business as part of our strategy to focus on other areas of the business. We continue to focus on risk consulting, software and other services for the insurance industry. The business was branded for a transitional period of 10 months from the closing date as JLT Towers Re.
	As part of the transaction, we entered into an Alliance Agreement with JLT that will ensure clients have continued access to our risk consulting and software services. This agreement will also provide JLT Towers Re with continued use of Towers Watson’s proprietary actuarial models and software.
	The Company assessed the guidance under ASC 205 to determine if the Alliance Agreement or any other terms of the sale agreement constituted significant continuing direct cash flows or significant continuing involvement with the Brokerage business after the sale. The Company compared the cash flows expected to be recognized from the Brokerage business as a result of the continuation or migration of activities after the disposal transaction to the projected generation of cash flows by the Brokerage business that we could have expected absent the disposal transaction. Based on this analysis, the expected annual cash inflows or outflows related to the portion of revenues shared or commissions received or paid and software sales under the Alliance Agreement were each expected to represent approximately 1% or less of the annual revenues generated by our Brokerage business operations prior to the disposal. This was deemed not significant. Actual results have been within the original expectations and continue to be not significant.
	The Company also calculated the expected cash flows associated with the placement of its insurance and reinsurance arrangements. The Company agreed to use JLT as its broker-of-record for all insurance and reinsurance transactions to which the Company’s wholly-owned captive insurance company, Stone Mountain Insurance Company, is a party through November 2018. These amounts were previously eliminated as intercompany transactions, and were $2.8 million for fiscal year 2014. Additionally, the Company agreed to a Transitional Services Agreement with JLT for a two-year period ending November 5, 2015. The Company expects to incur approximately $6.3 million each year in occupancy or other infrastructure costs, which were prepaid as part of deal consideration or will be repaid by JLT over the two-year period. The cash flows associated with these arrangements represented approximately 7.4% of the annual expenses generated by our Brokerage operations prior to the disposal, which was deemed not significant.
	The Company noted that none of the aforementioned agreements or arrangements constituted significant continuing involvement because they do not afford the Company the ability to influence the financial or operating decisions of JLT. Accordingly, we concluded that the continuing cash flows expected after the sale of our Brokerage business did not preclude discontinued operations presentation, and the Company therefore classified the results of our Brokerage business’s operations as discontinued operations for all periods presented in our condensed consolidated statements of operations. There was no revenue or income from discontinued operations in the current fiscal year. The following selected financial information relates to the Brokerage business’s operations for the three and six months ended December 31, 2013:
		Three Months Ended December 31, 2013			Six Months Ended December 31, 2013
	Revenue from discontinued operations	$	22,564		$	63,762
	Income from discontinued operations before taxes	9,894			24,398
	Tax expense on discontinued operations	3,692			8,801
	Net income from discontinued operations	$	6,202		$	15,597
	Gain from sale of discontinued operations	27,989			18,480
	Tax expense on gain from sale of discontinued operations	34,594			32,036
	Net loss from sale of discontinued operations	(6,605		)	(13,556		)
	Total net (loss)/income from discontinued operations	$	(403	)	$	2,041
	Only the fiduciary assets and liabilities associated with the European businesses were sold. North American fiduciary assets and liabilities were not disposed of during the sale due to certain legal restrictions which do not permit the transfer of these assets and liabilities. The subsequent settlement of the North American fiduciary assets and liabilities was presented within the operating section of our statement of cash flows for the year ended June 30, 2014.
	In addition to the stated $250 million cash consideration stipulated in the sale agreement, a purchase price adjustment of $31.4 million was paid to the Company by JLT representing the value of net assets transferred in the sale.
	As part of the sale, the Company agreed to repay JLT for retention payments made to certain employees of Brokerage if they remain with the business on the 30-day anniversary of the sale and the first and second anniversary of the sale. The value ascribed to this portion of the obligation is $21.7 million at the time of the sale. The remaining liability at December 31, 2014 is carried at fair value on the accompanying condensed consolidated balance sheets (see Note 5 – Fair Value Measurements). The total amount has been classified as current or non-current liabilities based on the expected payment dates.
	The obligation for retention payments and certain other negotiated terms reduced total consideration received at close to $215.1 million. Total transaction and integration costs were approximately $6.4 million. We finalized the completion accounts and the purchase price adjustments during the third quarter of fiscal 2014. Our final pre-tax gain on the sale was $24.0 million. The sale of our Brokerage business resulted in a significant taxable gain since the disposal of the goodwill and intangible assets associated with the business was not tax-deductible.

Investments

Investments	6 Months Ended
	Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]
Investments	Investments.
	Held-to-maturity - Our held-to-maturity investments are comprised of term deposits, certificates of deposit, and certain bonds with original maturities greater than 90 days. As of December 31, 2014 and June 30, 2014, all held-to-maturity investments were included in short-term investments in the accompanying condensed consolidated balance sheet. Proceeds from maturities of held-to-maturity investments were $214.5 million during the six months ended December 31, 2014, resulting in immaterial realized gains. There were no proceeds from maturities of held-to-maturity investments during the six months ended December 31, 2013.
	Available-for-sale - Our available-for-sale securities are comprised of equity securities and mutual funds / exchange-traded funds. Proceeds from sales and maturities of investments of available-for-sale securities during the six months ended December 31, 2014 were $11.7 million, resulting in immaterial gains. Proceeds from sales and maturities of investments of available-for-sale securities during the six months ended December 31, 2013 were $56.6 million, resulting in immaterial gains. Also during the six months ended December 31, 2013, the Company sold an available-for-sale security valued at $1.6 million as part of the divestiture of our Brokerage business.
	Additional information on the Company's investments is provided in the following table as of December 31, 2014 and June 30, 2014:
		As of December 31, 2014									As of June 30, 2014
		Amortized		Unrealized		Unrealized			Estimated		Amortized		Unrealized		Unrealized			Estimated
		Cost		Gains		Losses			Fair Value		Cost		Gains		Losses			Fair Value
	Short Term Investments:
	Held-to-maturity:
	Term deposits & Certificates of deposits	$	18,623	$	—	$	—		$	18,623	$	107,556	$	—	$	—		$	107,556
	Fixed income securities	21,840		—		(97		)	21,743		—		—		—			—
	Available-for-sale:
	Equity securities	102		—		(13		)	89		126		7		(3		)	130
	Mutual funds and exchange-traded funds	4,999		2		(18		)	4,983		15,033		42		—			15,075
	Total Short-Term Investments:	45,564		2		(128		)	45,438		122,715		49		(3		)	122,761
	Other Assets:
	Available-for-sale:
	Mutual funds and exchange-traded funds	45,927		—		(718		)	45,209		42,147		451		—			42,598
	Total Investments in Other Assets	$	45,927	$	—	$	(718	)	$	45,209	$	42,147	$	451	$	—		$	42,598
	For all investments other than fixed income securities, amortized cost represents the cost basis of the investment as of the purchase date. There were no material investments that have been in a continuous loss position for more than twelve months, and there have been no other-than-temporary impairments recognized. The aggregate fair value of investments with unrealized losses as of December 31, 2014 was $70.3 million. The aggregate fair value of investments with unrealized losses as of June 30, 2014 was immaterial.

Goodwill_and_Intangible_Assets

Goodwill and Intangible Assets	6 Months Ended
	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	Goodwill and Intangible Assets.
	The components of goodwill are outlined below for the six months ended December 31, 2014:
		Benefits			Risk and			Talent and			Exchange			All Other		Total
					Financial			Rewards			Solutions
					Services
	Balance as of June 30, 2014	$	1,290,789		$	391,549		$	113,862		$	515,644		$	1,214	$	2,313,058
	Goodwill related to acquisitions	—			—			—			(1,255		)	—		(1,255		)
	Goodwill reallocated in segment restructuring	(54,052		)	—			—			54,052			—		—
	Translation adjustment	(83,203		)	(28,816		)	(7,353		)	—			—		(119,372		)
	Balance as of December 31, 2014	$	1,153,534		$	362,733		$	106,509		$	568,441		$	1,214	$	2,192,431
	Included in the Benefits and Exchange Solutions information is a $54.1 million preliminary reclassification of goodwill related to the segment reorganization, which was effective on July 1, 2014. See Note 13 for additional information regarding the segment reorganization.
	The following table reflects changes in the net carrying amount of the components of finite-lived intangible assets for the six months ended December 31, 2014:
		Customer			Core/			Favorable			Total
		related			developed			lease
		intangible			technology			agreements
	Balance as of June 30, 2014	$	198,855		$	75,827		$	2,617		$	277,299
	Amortization	(22,741		)	(12,075		)	(474		)	(35,290		)
	Translation adjustment	(7,612		)	(512		)	(17		)	(8,141		)
	Balance as of December 31, 2014	$	168,502		$	63,240		$	2,126		$	233,868
	We record amortization related to our intangible assets. Exclusive of the amortization of our favorable lease agreements, for the three and six months ended December 31, 2014, we recorded $17.3 million and $34.8 million, respectively, of amortization, and for the three and six months ended December 31, 2013, we recorded $18.7 million and $38.0 million, respectively, of amortization. These amounts include amortization that has been classified within income from discontinued operations on the accompanying condensed consolidated statements of operations.
	Our indefinite-lived non-amortizable intangible assets consist of acquired trade names. The carrying value of these assets was $370.7 million and $380.0 million as of December 31, 2014 and June 30, 2014, respectively. The change during the period was due to foreign currency translation.
	Our acquired unfavorable lease liabilities were $8.7 million and $10.2 million as of December 31, 2014 and June 30, 2014, respectively, and are recorded in the other noncurrent liabilities in the condensed consolidated balance sheet. The change for the six months ended December 31, 2014 was comprised primarily of a reduction to rent expense of $1.5 million.
	The following table reflects the carrying value of finite-lived intangible assets and liabilities as of December 31, 2014 and June 30, 2014:
		As of December 31, 2014						As of June 30, 2014
		Gross			Accumulated			Gross			Accumulated
		Carrying			Amortization			Carrying			Amortization
		Amount						Amount
	Finite-lived intangible assets and liabilities:
	Trade name	$	520		$	520		$	520		$	520
	Customer related intangibles	371,767			203,265			391,201			192,346
	Core/developed technology	174,633			111,393			175,948			100,121
	Favorable lease agreements	6,407			4,281			6,488			3,871
	Total finite-lived intangible assets	$	553,327		$	319,459		$	574,157		$	296,858
	Unfavorable lease agreements	24,004			15,347			24,818			14,588
	Total finite-lived intangible liabilities	$	24,004		$	15,347		$	24,818		$	14,588
	Certain trademark and trade-name intangible assets have indefinite useful lives and are not amortized. The weighted average remaining life of amortizable intangible assets and liabilities at December 31, 2014 was 4.7 years.
	The table below reflects the following for the remainder of fiscal 2015 and for subsequent fiscal years:
	1) Future estimated amortization expense for amortizable intangible assets consisting of customer related intangibles and core/developed technology, and
	2) The rent offset resulting from the amortization of the net lease intangible assets and liabilities:
	Fiscal year ending June 30,	Amortization			Rent (Offset)
					Expense
	2015	$	34,758		$	(907	)
	2016	55,319			(1,594		)
	2017	51,123			(1,867		)
	2018	41,175			(1,981		)
	2019	26,661			(315		)
	Thereafter	22,706			133
	Total	$	231,742		$	(6,531	)

Fair_Value_Measurements

Fair Value Measurements	6 Months Ended
	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements.
	We have categorized our financial instruments into a three-level fair value hierarchy. The fair value hierarchy gives the highest priority to quoted prices in active markets for identical assets and liabilities (Level 1) and lowest priority to unobservable inputs (Level 3). In some cases, the inputs used to measure fair value might fall into different levels of the fair value hierarchy. In such cases, for disclosure purposes, the level in the fair value hierarchy within which the fair value measurement in its entirety falls is determined based on the lowest level input that is significant to the fair value measurement in its entirety.
	Financial assets and liabilities recorded in the accompanying condensed consolidated balance sheets are categorized based on the inputs in the valuation techniques as follows:
	Level 1 — Financial assets and liabilities whose values are based on quoted prices (unadjusted) in active markets for identical assets or liabilities that the reporting entity can access at the measurement date.
	Level 2 — Financial assets and liabilities whose values are based on inputs other than quoted prices included within Level 1 that are observable for the asset or liability, either directly or indirectly.
	Level 3 — Financial assets and liabilities whose values are based on unobservable inputs for the asset or liability.
	The following presents our assets and liabilities measured at fair value on a recurring basis at December 31, 2014 and June 30, 2014:
		Fair Value Measurements on a Recurring Basis at December 31, 2014
		Level 1			Level 2		Level 3		Total
	Assets:
	Available-for-sale securities:
	Equity securities	$	89		$	—	$	—	$	89
	Mutual funds / exchange traded funds	50,192			—		—		50,192
	Derivatives:
	Foreign exchange forwards (a)	—			2,000		—		2,000
	Liabilities:
	Derivatives:
	Foreign exchange forwards (a)	—			906		—		906
	Contingent Liabilities:
	Retention bonus liability (b)	—			—		9,914		9,914
		Fair Value Measurements on a Recurring Basis at June 30, 2014
		Level 1			Level 2		Level 3		Total
	Assets:
	Available-for-sale securities:
	Equity securities	$	130		$	—	$	—	$	130
	Mutual funds / exchange traded funds	57,673			—		—		57,673
	Derivatives:
	Foreign exchange forwards (a)	—			639		—		639
	Liabilities:
	Derivatives:
	Foreign exchange forwards (a)	—			550		—		550
	Contingent Liabilities:
	Retention bonus liability (b)	—			—		19,998		19,998
	_________________________
	(a)	These derivative investments are included in other current assets or accounts payable, accrued liabilities and deferred income on the accompanying condensed consolidated balance sheet. See Note 6 for further information on our derivative investments.
	(b)	This liability is included in other current liabilities and other noncurrent liabilities at June 30, 2014, and other current liabilities at December 31, 2014, on the accompanying condensed consolidated balance sheet. The fair value was determined using a discounted cash flow model.
	We record gains or losses related to the changes in the fair value of our financial instruments for foreign exchange forward contracts accounted for as foreign currency hedges in general and administrative expenses in the condensed consolidated statements of operations. For the three and six months ended December 31, 2014, we recorded gains of $0.5 million and $0.4 million, respectively, for instruments still held at December 31, 2014. For the three and six months ended December 31, 2013, we recorded gains of $0.3 million and $0.9 million, respectively, for instruments still held at December 31, 2013. There were no material gains or losses recorded in the condensed consolidated statements of operations for available-for-sale securities still held at December 31, 2014 or 2013.
	We generally use third-party pricing services in determining the fair value of our investments. The pricing services use observable inputs when available. These values take into account recent market activity as well as other market observable data such as interest rate, spread and prepayment information. We perform various procedures to evaluate the accuracy of the fair values provided by the third-party service provider. These procedures include obtaining a detailed understanding of the models, inputs, and assumptions used in developing prices provided by the pricing services. This understanding includes a review of the vendors’ Service Organization Controls report and, as necessary, discussions with valuation resources at the pricing services. We obtain the information necessary to assess the model, inputs and assumptions used to comply with U.S. GAAP, including disclosure requirements. Additional information related to the Company’s fair valuation process is included in our financial statements and the notes thereto as filed in our 2014 Annual Report on Form 10-K on August 15, 2014.
	Transfers in and out of Level 1 and 2
	There were no securities transferred between Level 1 and Level 2 for the three and six months ended December 31, 2014 or the year ended June 30, 2014. The Company’s policy is to recognize transfers in and transfers out as of the beginning of the reporting period.
	Level 3 Financial Instruments
	The fair value of the retention bonus liability is determined using a discounted cash flows model. The significant unobservable inputs used in the discounted cash flows model are a credit-adjusted interest rate of 1.8% and an assumed forfeiture rate of 7.0%. Changes in each of these unobservable inputs would have adjusted the fair value as follows:
	•	Interest rate - The lowest and highest interest rates that we could have used to value the bonus retention liability are 0.5% to 10.0%, which would have resulted in values of $10.0 million and $9.2 million, respectively.
	•	Forfeiture rates - Changing the assumed forfeiture rate to either 5.0% or 10.0% would have resulted in values of $10.1 million and $9.6 million, respectively.
	Fair Value Measurements using significant unobservable inputs (Level 3):
	Beginning balance - June 30, 2014	$	(19,998	)
	Payments	10,338
	Unrealized gains/(losses)	(254		)
	Ending balance - December 31, 2014	$	(9,914	)

Derivative_Financial_Instrumen

Derivative Financial Instruments	6 Months Ended
	Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	Derivative Financial Instruments.
	We are exposed to market risk from changes in foreign currency exchange rates. Where possible, we identify exposures in our business that can be offset internally. Where no natural offset is identified, we may choose to enter into various derivative transactions. These instruments have the effect of reducing our exposure to unfavorable changes in foreign currency rates. We do not enter into derivative transactions for trading purposes.
	A number of our foreign subsidiaries receive revenues (through either internal or external billing) in currencies other than their functional currency. As a result, the foreign subsidiary’s functional currency revenue will fluctuate as the currency exchange rates change. To reduce this variability, we use foreign exchange forward contracts to hedge the foreign exchange risk of the forecasted collections. We have designated these derivatives as cash flow hedges of the forecasted foreign currency denominated collections. We also use derivative financial contracts, principally foreign exchange forward contracts, to hedge other non-functional currency obligations. These exposures primarily arise from intercompany lending and other liabilities denominated in foreign currencies. At December 31, 2014, the longest outstanding maturity was 15 months. As of December 31, 2014, a net $1.7 million pretax gain was deferred in accumulated other comprehensive income and is expected to be recognized in general and administrative expenses during the next 12 months when the hedged revenue is recognized.
	As of December 31, 2014 and June 30, 2014, we had cash flow and economic hedges with a notional value of $62.2 million and $49.5 million, respectively, to hedge cash flow and balance sheet exposures. We determine the fair value of our foreign currency derivatives based on quoted prices received from the counterparty for each contract, which we evaluate using pricing models whose inputs are observable. The net fair value of all derivatives held as of December 31, 2014 and June 30, 2014 was an asset of $1.1 million and an asset of $0.1 million, respectively. See Note 5, Fair Value Measurements, for further information regarding the determination of fair value.
	The fair value of our derivative instruments held as of December 31, 2014 and June 30, 2014 and their location in the condensed consolidated balance sheet are as follows:
		Derivative assets										Derivative liabilities
		Balance sheet		Fair value								Balance sheet		Fair value
		location										location
				31-Dec-14				30-Jun-14						31-Dec-14				30-Jun-14
	Derivatives designated as hedging instruments:
	Foreign exchange forwards	Other current assets		$	1,937			$	618			Accounts payable,		$	(255	)		$	(513	)
												accrued liabilities
												and deferred income
	Derivatives not designated as hedging instruments:
	Foreign exchange forwards	Other current assets		63				21				Accounts payable,		(651		)		(37		)
												accrued liabilities
												and deferred income
	Total derivative assets (liabilities)			$	2,000			$	639					$	(906	)		$	(550	)
	The effects of derivative instruments that are designated as hedging instruments on the condensed consolidated statements of operations and the condensed consolidated statements of changes in stockholders’ equity for the three and six months ended December 31, 2014 and 2013 are as follows:
	Three Months Ended		Gain/(loss) recognized in OCI								Location		Gain/(loss) reclassified								Location of gain recognized in income	Gain recognized
	December 31,		(effective portion)								of gain/(loss) reclassified		from OCI into income								(ineffective portion and	in income (ineffective
											from OCI into income		(effective portion)								amount excluded from	portion and
											(effective portion)										effectiveness testing)	amount excluded from
																						effectiveness testing)
			2014				2013						2014				2013					2014		2013
	Foreign exchange forwards		$	589			$	(431	)		General and		$	437			$	(394	)		General and	$	38	$	2
											administrative										administrative
											expenses										expenses
	Total		$	589			$	(431	)				$	437			$	(394	)			$	38	$	2
	Six Months Ended		Gain/(loss) recognized in OCI								Location		Gain/(loss) reclassified								Location of gain recognized in income	Gain recognized
	December 31,		(effective portion)								of gain/(loss) reclassified		from OCI into income								(ineffective portion and	in income (ineffective
											from OCI into income		(effective portion)								amount excluded from	portion and
											(effective portion)										effectiveness testing)	amount excluded from
																						effectiveness testing)
			2014				2013						2014				2013					2014		2013
	Foreign exchange forwards		$	1,774			$	(2,062	)		General and		$	281			$	(332	)		General and	$	13	$	3
											administrative										administrative
											expenses										expenses
	Total		$	1,774			$	(2,062	)				$	281			$	(332	)			$	13	$	3
	Included in the notional values above are $25.3 million and $24.2 million as of December 31, 2014 and June 30, 2014, respectively, of derivatives held as economic hedges primarily to hedge intercompany loans denominated in currencies other than the functional currency. The effects of derivatives that have not been designated as hedging instruments on the condensed consolidated statements of operations for the three and six months ended December 31, 2014 and 2013 are as follows:
					(Loss)/gain recognized in income
					Three Months Ended								Six Months Ended
					December 31,								December 31,
	Derivatives not designated as hedging instruments:		Location of (loss)/gain		2014				2013				2014				2013
			recognized in income
	Foreign exchange forwards		General and administrative expenses		$	(796	)		$	(85	)		$	(2,691	)		$	520
	Total				$	(796	)		$	(85	)		$	(2,691	)		$	520

Retirement_Benefits

Retirement Benefits	6 Months Ended
	Dec. 31, 2014
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]
Retirement Benefits	Retirement Benefits.
	Defined Benefit Plans
	Towers Watson sponsors both qualified and non-qualified defined benefit pension plans and other post-retirement benefit plans in North America and Europe. As of June 30, 2014, these funded and unfunded plans represented 98 percent of Towers Watson’s pension and other post-retirement benefit obligations and are disclosed herein. Towers Watson also sponsors funded and unfunded defined benefit pension plans in certain other countries as well, representing the remaining two percent of the liability. All expenses and contributions presented in this note are inclusive of amounts classified as discontinued operations in the accompanying condensed consolidated statements of operations.
	Components of Net Periodic Benefit Cost for Defined Benefit Pension Plans
	The following table sets forth the components of net periodic benefit cost for the Company’s defined benefit pension plan for North America and Europe for the three and six months ended December 31, 2014 and 2013:
		Three Months Ended December 31,
		2014						2013
		North			Europe			North			Europe
		America						America
	Service cost	$	17,683		$	3,190		$	17,538		$	3,074
	Interest cost	34,522			9,883			35,212			10,249
	Expected return on plan assets	(53,078		)	(12,533		)	(47,181		)	(11,532		)
	Amortization of net loss	4,573			3,123			5,475			2,250
	Amortization of prior service (credit)/cost	(2,095		)	10			(2,095		)	11
	Net periodic benefit cost	$	1,605		$	3,673		$	8,949		$	4,052
		Six Months Ended December 31,
		2014						2013
		North			Europe			North			Europe
		America						America
	Service cost	$	35,894		$	6,562		$	35,326		$	6,039
	Interest cost	69,153			20,318			70,566			20,096
	Expected return on plan assets	(106,368		)	(25,758		)	(94,407		)	(22,589		)
	Amortization of net loss	8,951			6,425			11,124			4,419
	Amortization of prior service (credit)/cost	(4,190		)	21			(4,189		)	21
	Net periodic benefit cost	$	3,440		$	7,568		$	18,420		$	7,986
	The decrease in our North American pension expense was primarily driven by an increase in the expected return on assets. This higher expected return in fiscal year 2015 relates to larger pension asset values at the beginning of the fiscal year caused by favorable investment returns in fiscal year 2014.
	Components of Net Periodic Benefit Cost for Other Postretirement Plans
	The following table sets forth the components of net periodic benefit cost for the Company’s post-retirement plans for the three and six months ended December 31, 2014 and 2013:
		Three Months Ended						Six Months Ended
		December 31,						December 31,
		2014			2013			2014			2013
	Service cost	$	320		$	366		$	641		$	734
	Interest cost	2,042			2,220			4,094			4,442
	Expected return on plan assets	(24		)	(28		)	(48		)	(56		)
	Amortization of net gain	(440		)	(433		)	(880		)	(863		)
	Amortization of prior service credit	(1,726		)	(1,751		)	(3,452		)	(3,503		)
	Net periodic benefit cost	$	172		$	374		$	355		$	754
	Employer Contributions to Defined Benefit Pension Plans
	The Company made $31.1 million in contributions to the North American plans during the first six months of fiscal year 2015, and anticipates making $4.9 million in contributions over the remainder of the fiscal year. The Company made $31.3 million in contributions to European plans during the first six months of fiscal year 2015, and anticipates making $15.3 million in contributions over the remainder of the fiscal year.
	Defined Contribution Plans
	The cost of the Company's contributions to the various U.S. defined contribution plans amounted to $6.5 million and $7.5 million for the three months ended December 31, 2014 and 2013, respectively, and to $11.1 million and $13.5 million for the six months ended December 31, 2014 and 2013, respectively.
	The cost of the Company's contributions to the various U.K. defined contribution plans amounted to $4.9 million and $4.1 million for the three months ended December 31, 2014 and 2013, respectively, and to $9.9 million for each of the six months ended December 31, 2014 and 2013.

Debt_Commitments_and_Contingen

Debt, Commitments and Contingent Liabilities	6 Months Ended
	Dec. 31, 2014
Debt Commitments And Contingent Liabilities [Abstract]
Debt, Commitments And Contingent Liabilities	Debt, Commitments and Contingent Liabilities.
	The debt, commitments and contingencies described below are currently in effect and would require Towers Watson, or domestic subsidiaries, to make payments to third parties under certain circumstances. In addition to commitments and contingencies specifically described below, Towers Watson has historically provided guarantees on an infrequent basis to third parties in the ordinary course of business.
	Towers Watson Senior Credit Facility
	On November 7, 2011, Towers Watson and certain subsidiaries entered into a five-year, $500 million revolving credit facility, which amount may be increased by an aggregate amount of $250 million, subject to the satisfaction of customary terms and conditions, with a syndicate of banks (the “Senior Credit Facility”). Borrowings under the Senior Credit Facility bear interest at a spread to either LIBOR or the Prime Rate. During the six months ended December 31, 2014 and 2013, the weighted-average interest rate on borrowings under the Senior Credit Facility was 1.40% and 1.98%, respectively. We are charged a quarterly commitment fee, currently 0.175% of the Senior Credit Facility, which varies with our financial leverage and is paid on the unused portion of the Senior Credit Facility. Obligations under the Senior Credit Facility are guaranteed by Towers Watson and all of its domestic subsidiaries (other than Professional Consultants Insurance Company (“PCIC”), a majority-owned captive insurance company, and Stone Mountain Insurance Company (“SMIC”), a wholly-owned captive insurance company).
	The Senior Credit Facility contains customary representations and warranties and affirmative and negative covenants. The Senior Credit Facility requires Towers Watson to maintain certain financial covenants that include a minimum Consolidated Interest Coverage Ratio and a maximum Consolidated Leverage Ratio (which terms in each case are defined in the Senior Credit Facility). In addition, the Senior Credit Facility contains restrictions on the ability of Towers Watson to, among other things, incur additional indebtedness; pay dividends; make distributions; create liens on assets; make acquisitions; dispose of property; engage in sale-leaseback transactions; engage in mergers or consolidations, liquidations and dissolutions; engage in certain transactions with affiliates; and make changes in lines of businesses. As of December 31, 2014, we were in compliance with our covenants.
	As of December 31, 2014, Towers Watson had borrowings of $50.0 million outstanding under the Senior Credit Facility.
	Letters of Credit under the Senior Credit Facility
	As of December 31, 2014, Towers Watson had standby letters of credit totaling $21.4 million associated with our captive insurance companies in the event that we fail to meet our financial obligations. Additionally, Towers Watson had $0.8 million of standby letters of credit covering various other existing or potential business obligations. The aforementioned letters of credit are issued under the Senior Credit Facility, and therefore reduce the amount that can be borrowed under the Senior Credit Facility by the outstanding amount of these standby letters of credit.
	Term Loan Agreement Due June 2017
	On June 1, 2012, the Company entered into a five-year $250 million amortizing term loan facility (“the Term Loan”) with a consortium of banks. The interest rate on the term loan is based on the Company’s choice of one, three or six month LIBOR plus a spread of 1.25% to 1.75%, or alternatively the bank base rate plus 0.25% to 0.75%. The spread to each index is dependent on the Company’s consolidated leverage ratio. The weighted-average interest rate on the Term Loan during the six months ended December 31, 2014 and 2013 was 1.40% and 1.43%, respectively. The Term Loan amortizes at a rate of $6.3 million per quarter, beginning in September 2013, with a final maturity date of June 1, 2017. The Company has the right to prepay a portion or all of the outstanding Term Loan balance on any interest payment date without penalty. At December 31, 2014, the balance on the Term Loan was $212.5 million.
	This agreement contains substantially the same terms and conditions as our Senior Credit Facility, including guarantees from all of the domestic subsidiaries of Towers Watson (other than PCIC and SMIC). The Company entered into the Term Loan as part of the financing of our acquisition of Extend Health on May 29, 2012.
	Indemnification Agreements
	Towers Watson has various agreements which provide that it may be obligated to indemnify the other party to the agreement with respect to certain matters. Generally, these indemnification provisions are included in contracts arising in the normal course of business and in connection with the purchase and sale of certain businesses. Although it is not possible to predict the maximum potential amount of future payments that may become due under these indemnification agreements because of the conditional nature of Towers Watson’s obligations and the unique facts of each particular agreement, Towers Watson does not believe any potential liability that might arise from such indemnity provisions is probable or material. There are no provisions for recourse to third parties, nor are any assets held by any third parties that any guarantor can liquidate to recover amounts paid under such indemnities.
	Legal Proceedings
	From time to time, Towers Watson and its subsidiaries are parties to various lawsuits, arbitrations or mediations that arise in the ordinary course of business. Towers Watson was formed on January 1, 2010, upon the merger (the “Merger”) of Watson Wyatt Worldwide, Inc. (“Watson Wyatt”) and Towers, Perrin, Forster & Crosby, Inc. (“Towers Perrin”), and its subsidiaries include both Watson Wyatt and Towers Perrin. The matters reported on below are the material pending claims against Towers Watson and its subsidiaries. We do not expect the impact of claims not described below to be material to Towers Watson’s financial statements. We also receive subpoenas in the ordinary course of business and, from time-to-time, receive requests for information in connection with governmental investigations.
	Towers Watson carries substantial professional liability insurance which, effective July 1, 2010, has been provided by SMIC. For the policy period beginning July 1, 2011 certain changes were made to our professional liability insurance program. Our professional liability insurance for each annualized policy period commencing July 1, 2011, up to and including the policy period commencing July 1, 2014, includes a $10 million aggregate self-insured retention above the $1 million self-insured retention per claim, including the cost of defending such claims. SMIC provides us with $40 million of coverage per claim and in the aggregate, above the retentions, including the cost of defending such claims. SMIC secured $25 million of reinsurance from unaffiliated reinsurance companies in excess of the $15 million SMIC retained layer. Excess insurance attaching above the SMIC coverage is provided by various unaffiliated commercial insurance companies.
	This structure effectively results in Towers Watson and SMIC bearing the first $25 million of loss per occurrence or in the aggregate above the $1 million per claim self-insured retention. As a wholly-owned captive insurance company, SMIC is consolidated into our financial statements.
	Before the Merger, Watson Wyatt and Towers Perrin each obtained substantial professional liability insurance from PCIC. A limit of $50 million per claim and in the aggregate was provided by PCIC subject to a $1 million per claim self-insured retention. PCIC secured reinsurance of $25 million attaching above the $25 million PCIC retained layer from unaffiliated reinsurance companies. Our ownership interest in PCIC is 72.86%. As a consequence, PCIC’s results are consolidated in Towers Watson’s operating results. PCIC ceased issuing insurance policies effective July 1, 2010 and at that time entered into a run-off mode of operation. Our shareholder agreements with PCIC could require additional payments to PCIC if development of claims significantly exceeds prior expectations.
	We provide for the self-insured retention where specific estimated losses and loss expenses for known claims are considered probable and reasonably estimable. Although we maintain professional liability insurance coverage, this insurance does not cover claims made after expiration of our current policies of insurance. Generally accepted accounting principles require that we record a liability for incurred but not reported (“IBNR”) professional liability claims if they are probable and reasonably estimable. We use actuarial assumptions to estimate and record our IBNR liability. As of December 31, 2014, we had a $181.2 million IBNR liability balance, net of estimated IBNR recoverable receivables of our captive insurance companies. This net liability was $173.8 million as of June 30, 2014. To the extent our captive insurance companies, PCIC and SMIC, expect losses to be covered by a third party, they record a receivable for the amount expected to be recovered. This receivable is classified in other current or other noncurrent assets in our condensed consolidated balance sheet.
	We reserve for contingent liabilities based on ASC 450, Contingencies, when it is determined that a liability, inclusive of defense costs, is probable and reasonably estimable. The contingent liabilities recorded are primarily developed actuarially. Litigation is subject to many factors which are difficult to predict so there can be no assurance that in the event of a material unfavorable result in one or more claims, we will not incur material costs.
	Current and Former Employees of Teck Metals, Ltd.
	A class action is currently pending against the Company in the Supreme Court of British Columbia. On July 14, 2009, James Weldon, an employee of Teck Metals, Ltd. (“Teck”) commenced an action against Teck and Towers Perrin Inc. (now known as Towers Watson Canada Inc.). On October 17, 2011, Leonard Bleier, a former employee of Teck, sued Teck and Towers Perrin. Aside from their employment status, the allegations in the action commenced by Bleier (retired from Teck in 2006) are substantively similar in all material respects to those in the action commenced by Weldon (employed by Teck at the time the action commenced). Both actions were brought in the Supreme Court of British Columbia, and that court consolidated the actions on June 21, 2012.
	On October 1, 2012, the Company filed a response to the plaintiffs' consolidated and amended claim denying the legal and factual basis for the plaintiffs' claim. On December 21, 2012, the court certified the consolidated case as a class action.
	At all times relevant to the plaintiffs’ claim, Towers Perrin acted as the actuarial advisor for Teck’s defined benefit pension plan. According to the plaintiffs' allegations, in 1992 and on Towers Perrin's advice, Teck offered its non-union, salaried employees a one-time option to continue participation in Teck’s defined benefit pension plan or to transfer to a newly established defined contribution plan. The plaintiffs also allege that Towers Perrin assisted Teck in preparing—and that Towers Perrin approved—informational materials and a computer-based modeling tool that Teck distributed to eligible employees prior to the employees electing whether to transfer. Several hundred employees elected to transfer from the defined benefit pension plan to the defined contribution plan on January 1, 1993.
	The plaintiff class comprises current and former Teck employees who elected to transfer from the defined benefit pension plan to the defined contribution plan. As of October 23, 2014, the Company understands there to be 436 individuals in the class.
	The plaintiffs, on behalf of the class, allege that Towers Perrin was professionally negligent and that Teck and Towers Perrin breached statutory and fiduciary duties and acted deceitfully by providing incomplete, inaccurate, and misleading information to participants in Teck’s defined benefit plan regarding the option to transfer to the defined contribution plan. Principally, the plaintiffs allege that the risks of the defined contribution plan—including investment risk and annuity risk—were downplayed, either negligently or with the specific intent of causing eligible employees to transfer to the defined contribution plan.
	The plaintiffs seek assorted declaratory relief; an injunction reinstating them and all class members into the defined benefit plan with full rights and benefits as if they had not transferred; disgorgement against Teck; damages in the amount necessary to provide the plaintiffs and all class members with the pension and other benefits they would have accrued if they had not transferred; interest as allowed by law; and such further and other relief as to the court may seem just.
	In a settlement agreement dated October 31, 2014, the Company, plaintiffs, and Teck agreed to resolve all claims in this litigation. The settlement agreement is subject to court approval. Based on all of the information to date, the Company believes that any loss beyond accrued amounts is unlikely.
	City of Houston
	On August 1, 2014, the City of Houston ("plaintiff") filed suit against the Company in the United States District Court for the Southern District of Texas, Houston Division.
	In the complaint, plaintiff alleges various deficiencies in pension actuarial work-product and advice stated to have been provided by the Company's predecessor firm, Towers Perrin, in its capacity as principal actuary to the Houston Firefighters' Relief and Retirement Fund (the "Fund"). ‎Towers Perrin is stated to have acted in this capacity between "the early 1980s until 2002".
	In particular, the complaint is critical of two reports allegedly issued by Towers Perrin — one in February 2000 and the other in April 2000 — containing actuarial valuations upon which plaintiff claims to have relied. Plaintiff claims that the reports indicated that the City’s minimum contribution percentages to the Fund would remain in place through at least 2018; and ‎that existing benefits under the Fund could be increased, and new benefits could be added, without increasing plaintiff's financial burden, and without increasing plaintiff's rate of annual contributions to the Fund. The complaint alleges that plaintiff relied on these reports when supporting a new benefit package for the Fund.  These reports, and other advice, are alleged, among other things, to have been negligent, to have misrepresented the present and future financial condition of the Fund and the contributions required to be made by plaintiff to support those benefits, and to have constituted professional malpractice. Plaintiff asserts that, but for Towers Perrin's alleged negligence and misrepresentations, plaintiff would not have supported the benefit increase, and that such increased benefits would not and could not have been approved or enacted.  It is further asserted that Towers Perrin's alleged "negligence and misrepresentations damaged the City to the tune of tens of millions of dollars in annual contributions."
	Plaintiff seeks the award of actual damages, exemplary damages, special damages, attorney's fees and expenses, costs of suit, pre- and post- judgment interest at the maximum legal rate, and other unspecified legal and equitable relief.  Plaintiff has not yet quantified fully its asserted damages.  Given the stage of the proceedings, the Company is currently unable to provide an estimate of the reasonably possible loss or range of loss. The Company disputes the allegations, and intends to defend the lawsuit vigorously.
	On October 10, 2014, the Company filed a motion to dismiss plaintiff's entire complaint on the basis that the complaint fails to state a claim upon which relief can be granted. On November 21, 2014, the City filed its response in opposition to the Company's motion to dismiss. To date, no hearing on that motion has been scheduled.
	British Coal Staff Superannuation Scheme
	On September 4, 2014, Towers Watson Limited ("TWL"), a wholly-owned subsidiary of the Company, received a Letter of Claim (the "Demand Letter") on behalf of Coal Staff Superannuation Scheme Trustees Limited (the "Trustee"), trustee of the British Coal Staff Superannuation Scheme (the "Scheme").  The Demand Letter was sent under the Professional Negligence Pre-Action Protocol, a pre-action dispute resolution procedure which applies in England and Wales.
	In the Demand Letter, it is asserted that the Trustee has a claim against TWL in respect of allegedly negligent investment consulting advice provided to it by Watson Wyatt Limited, in the United Kingdom, in particular with regard to a currency hedge that was implemented in connection with the Scheme’s investment of £250,000,000 in a Bluebay local currency emerging market debt fund in August 2008.  It is alleged that the currency hedge has caused a substantial loss to the Scheme, quantified at £47,500,000, for the period August 2008 to October 2012.
	TWL sent a Letter of Response on December 23, 2014.
	Based on all of the information to date, and given the stage of the matter, TWL is currently unable to provide an estimate of the reasonably possible loss or range of loss.  TWL disputes the allegations, and intends to defend the matter vigorously.
	Meriter Health Services
	On January 12, 2015, Towers Watson Delaware Inc. ("TWDE"), a wholly-owned subsidiary of the Company, was served with a Summons and Complaint (the "Complaint") on behalf of Meriter Health Services, Inc. ("Meriter"), plan sponsor of the Meriter Health Services Employee Retirement Plan (the “Plan”).  The Complaint was filed in Wisconsin State Court in Dane County.
	In the Complaint, among other allegations, it is asserted that Meriter has a claim against TWDE, and other entities, in respect of allegedly negligent benefits consulting advice provided to it by Towers, Perrin, Forster & Crosby, Inc. (“TPFC”) and Davis, Conder, Enderle & Sloan, Inc. (“DCES”), including TPFC’s involvement in the Plan design and drafting of the Plan document in 1987, DCES’ Plan review in 2001, and Plan redesign, Plan amendment and drafting of ERISA section 204(h) notices. Additionally, Meriter asserts that TPFC and DCES breached an alleged duty to advise Meriter regarding the competency of Meriter’s then ERISA counsel.
	In 2010, a putative class action lawsuit related to the Plan was filed by Plan participants against Meriter alleging a number of claims involving ERISA. The lawsuit was settled in 2015 for $82 million. While the Complaint does not include a specific, quantified demand, it does refer to the $82 million paid out by Meriter in settlement of the class action, and other damages which are not specified in the Complaint.
	Based on all of the information to date, and given the stage of the matter, TWDE is currently unable to provide an estimate of the reasonably possible loss or range of loss.  TWDE disputes the allegations, and intends to defend the matter vigorously.

Variable_Interest_Entities

Variable Interest Entities	6 Months Ended
	Dec. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Variable Interest Entities	Variable Interest Entities.
	We offer integrated solutions that include different combinations of investment management or consulting, pension administration, and actuarial services, through funding vehicles holding approximately $4.0 billion of assets in entities that are considered variable interest entities ("VIEs") and for which our management fee is considered a variable interest. In addition, some of the investments in these entities are held by the Company's retirement plans, which are considered related parties.
	We have determined that some of the VIEs qualify for the deferral to certain provisions of ASC Subtopic 810-10, Consolidation – Overall, afforded by ASU 2010-10, Consolidation – Amendments for Certain Investment Funds. In accordance with this deferral, we determine whether we consolidate each VIE based on whether we absorb a majority of the VIE’s expected losses or receive a majority of the VIE’s expected returns. For VIEs that do not qualify for the deferral, we determine whether we consolidate based on whether we have both the power to direct the activities that most significantly impact the VIE and a variable interest that could potentially be significant to the VIE.
	We are not the primary beneficiary and therefore do not consolidate any of the funds as of December 31, 2014 or June 30, 2014. Our maximum exposure to loss of these unconsolidated VIEs is limited to collection of any unpaid management fees (which are not material) and any potential increase to pension funding obligation due to losses incurred by the funds in which the Company's retirement plans are invested. The Company has no obligation to provide financial or other support to these VIEs, other than guarantees to provide the minimum statutorily-mandated capital. The Company reassesses its initial evaluation of whether an entity is a VIE when certain reconsideration events occur. The Company reassesses its determination of whether it is the primary beneficiary on an ongoing basis based on current facts and circumstances.

Accumulated_Other_Comprehensiv

Accumulated Other Comprehensive Income/(Loss)	6 Months Ended
	Dec. 31, 2014
Equity [Abstract]
Accumulated Other Comprehensive Income/(Loss)	Accumulated Other Comprehensive Income/(Loss).
	Changes in accumulated other comprehensive income/(loss), net of non-controlling interests, are provided in the following table. The difference between the amounts presented in this table and the amounts presented in the condensed consolidated statements of comprehensive income are the corresponding components attributable to non-controlling interests, which are not material for further disclosure.
		Foreign			Hedge effectiveness (1)									Available-for-sale									Defined pension and
		currency												securities (2)									post-retirement benefit costs (3)
		translation
		-1			Before			Tax			After			Before			Tax			After			Before			Tax			After
					Tax						Tax			Tax						Tax			Tax						Tax
	As of June 30, 2014	$	2,271		$	144		$	(79	)	$	65		$	344		$	(114	)	$	230		$	(262,902	)	$	70,634		$	(192,268	)
	Other comprehensive income/(loss) before reclassifications	(184,302		)	1,774			(707		)	1,067			(282		)	98			(184		)	—			—			—
	Amounts reclassified from accumulated other comprehensive income	—			(281		)	112			(169		)	(35		)	—			(35		)	7,210			(1,491		)	5,719
	Net current-period other comprehensive income/(loss)	(184,302		)	1,493			(595		)	898			(317		)	98			(219		)	7,210			(1,491		)	5,719
	As of December 31, 2014	$	(182,031	)	$	1,637		$	(674	)	$	963		$	27		$	(16	)	$	11		$	(255,692	)	$	69,143		$	(186,549	)
	________________________
	-1	Reclassification adjustments from accumulated other comprehensive income are included in general and administrative expenses (see Note 6 – Derivative Financial Instruments for additional details regarding the reclassification adjustments for the hedge settlements)
	-2	Reclassification adjustments from accumulated other comprehensive income are included in general and administrative expenses
	-3	Reclassification adjustments from accumulated other comprehensive income are included in the computation of net periodic pension cost (see Note 7 – Retirement Benefits for additional details)

ShareBased_Compensation

Share-Based Compensation	6 Months Ended
	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Share-Based Compensation	Share-Based Compensation.
	Restricted Stock Units
	Executives and Employees
	The Compensation Committee of our Board of Directors approves performance-vested restricted stock unit awards pursuant to the Towers Watson & Co. 2009 Long Term Incentive Plan. RSUs are designed to provide us an opportunity to offer our long-term incentive program ("LTIP") and to provide key executives with a long-term stake in our success. RSUs are notional, non-voting units of measurement based on our common stock. Under the RSU agreement, participants become vested in a number of RSUs based on the achievement of specified levels of financial performance during the performance period set forth in the agreement, provided that the participant remains in continuous service with us through the end of the performance period. Any RSUs that become vested are payable in shares of our Class A Common Stock. Dividend equivalents will accrue on RSUs and vest to the same extent as the underlying shares. The form of performance-vested restricted stock unit award agreement includes a provision whereby the Committee could provide for continuation of vesting of restricted stock units upon an employee’s termination under certain circumstances such as a qualified retirement. This definition of qualified retirement is age 55 and with 15 years of experience at the company and a minimum of one year of service in the performance period.
	These awards are typically approved by the Compensation Committee of the Board of Directors in the first quarter of the fiscal year. The LTIP awards are generally based on the value of the executive officer’s annual base salary and a multiplier, which is then converted into a target number of RSUs based on our closing stock price as of the date of grant. Between 0% and 204%, or between 0% and 240% for the 2014 Exchange Solutions ("ES") LTIP, of the target number of RSUs will vest based on the extent to which specified performance metrics are achieved over the three-year performance period, subject to the employee or executive officers’ continued employment with us through the end of the performance period, except in the case of a qualified retirement. For participants that meet the requirement for qualified retirement, we record the expense of their awards over the one-year service period as performed. The Compensation Committee approved the grants and established adjusted three-year average EPS and revenue growth during the performance period as the performance metrics for the awards, with the exception of the 2014 ES LTIP awards, which metrics are based on EBITDA margin and revenue growth. We record stock-based compensation expense over the performance period beginning with the date of grant and will adjust the expense for their awards based upon the level of performance achieved.
	The Compensation Committee of the Board of Directors also approves RSUs to certain employees under our Select Equity Plan (“SEP”) during the first quarter of the fiscal year. The RSUs vest annually over a three-year period and include an assumed forfeiture rate.
	The following table presents key information with regard to each of the awards that had been granted as of December 31, 2014:
	Plan	Performance Period	RSUs Awarded	Grant Date Stock Price	Assumed Forfeiture Rate
	2015 LTIP	July 1, 2014 to June 30, 2017	76,202	$100.02	None
	2014 LTIP	July 1, 2013 to June 30, 2016	65,355	$105.90 and $110.70	None
	2013 LTIP	July 1, 2012 to June 30, 2015	121,075	$54.59	None
	2014 ES LTIP	July 1, 2013 to June 30, 2016	30,192	$91.43	None
	2014 SEP	July 1, 2014 to June 30, 2017	112,464	$106.89	5%
	2013 SEP	July 1, 2013 to June 30, 2016	131,286	$91.43	5%
	2012 SEP	July 1, 2012 to June 30, 2015	147,503	$53.93	5%
	Total expense related to our LTIP and SEP awards, and other miscellaneous RSU awards for the three months ended December 31, 2014 and 2013 was $6.1 million and $3.6 million, respectively, and $16.1 million and $9.1 million for the six months ended December 31, 2014 and 2013, respectively.
	Outside Directors
	The Towers Watson & Co. Compensation Plan for Non-Employee Directors provides for cash and stock compensation for outside directors for service on the board of directors. During the three months ended September 30, 2014, 8,059 RSUs were granted for the annual award for outside directors, which vest in equal quarterly installments over fiscal year 2015. During the three months ended September 30, 2013, 10,251 RSUs were granted for the annual award for outside directors, which vest in equal quarterly installments over fiscal year 2014. We recorded stock-based compensation expense related to these grants in the amount of $0.3 million and $0.2 million for the three months ended December 31, 2014 and 2013, respectively, and $0.7 million for each of the six months ended December 31, 2014 and 2013.
	Acquired Plans
	Liazon RSUs. In November 2013, in connection with the acquisition, we assumed the Liazon Corporation 2011 Equity Incentive Plan and converted the outstanding unvested restricted stock units into 70,533 Towers Watson restricted stock units using a conversion ratio stated in the agreement for the exercise price and number of options. The fair value of these restricted stock units was calculated using the fair value share price of Towers Watson’s closing share price on the date of acquisition. We determined the fair value of the portion of the 70,533 outstanding RSUs related to pre-acquisition employee service using Towers Watson graded vesting methodology from the date of grant to the acquisition date to be $5.7 million which was added to the transaction consideration. The fair value of the remaining portion of RSUs related to the post-acquisition employee services was $2.1 million, and will be recorded over the future vesting periods.
	Liazon Options. In November 2013, in connection with the Liazon acquisition, we assumed the Liazon Corporation 2011 Equity Incentive Plan and converted the outstanding unvested employee stock options into 37,162 Towers Watson stock options using a conversion ratio stated in the agreement for the exercise price and number of options. The fair value of the vested stock options was calculated using the Black-Scholes model with a volatility and risk-free interest rate over the expected term of each group of options using the fair value share price of Towers Watson’s closing share price on the date of acquisition. The fair value of the new awards was less than the acquisition date fair value of the replaced Liazon options; accordingly, no compensation expense was recorded. We determined the fair value of the portion of the 37,162 outstanding options relating to the pre-acquisition employee service using Towers Watson graded vesting methodology from the date of grant to the acquisition date to be $2.2 million, which was added to the transaction consideration. The fair value of the remaining portion of unvested options related to the post-acquisition employee service was $1.7 million, which will be recorded over the future vesting periods.
	Extend Health Options. In May 2012, we assumed the Extend Health, Inc. 2007 Equity Incentive Plan and converted the outstanding unvested employee stock options into 377,614 Towers Watson stock options using a conversion ratio stated in the agreement for the exercise price and number of options. The fair value of the vested stock options was calculated using the Black-Scholes model with a volatility and risk-free interest rate over the expected term of each group of options using the fair value share price of Towers Watson’s closing share price on the date of acquisition. The fair value of the new awards was less than the acquisition date fair value of the replaced Extend Health options; accordingly, no compensation expense was recorded. We determined the fair value of the portion of the 377,614 outstanding options related to pre-acquisition employee service using Towers Watson graded vesting methodology from the date of grant to the acquisition date was $11.2 million, which was added to the transaction consideration. The fair value of the remaining portion of the unvested options, less 10% estimated forfeitures, was $7.9 million, and will be recorded over the future vesting periods.
	Total expense related to our acquired plans for the three months ended December 31, 2014 and 2013 was $0.9 million and $0.8 million, respectively, and $1.6 million and $1.3 million for the six months ended December 31, 2014 and 2013, respectively.

Income_Taxes

Income Taxes	6 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes.
	Provision for income taxes on continuing operations for the three and six months ended December 31, 2014 was $55.4 million and $99.4 million, respectively, compared to $42.3 million and $57.1 million, respectively, for the three and six months ended December 31, 2013. The effective tax rate was 34.1% for the six months ended December 31, 2014 and 24.5% for the six months ended December 31, 2013. The prior year effective tax rate was lower due to income tax benefits on the release of uncertain tax positions of 7.3% related to the lapses in statute of limitations in various taxing jurisdictions, primarily the U.S., and an income tax benefit of 1.6% in connection with the enacted statutory tax rate reduction in the U.K. The impact of these prior year income tax benefits were recognized in the first quarter of fiscal 2014. Towers Watson records a tax benefit on net operating loss carryovers and net deferred tax assets only if it is more likely than not that a benefit will be realized.
	We have liabilities for uncertain tax positions under ASC 740, Income Taxes. The expected settlement period for the $36.8 million liability, which excludes interest and penalties, cannot be reasonably estimated because it depends on the timing and possible outcomes of tax examinations with various tax authorities.
	It is reasonably possible that during the next 12 months the Company’s liability for uncertain tax positions may change by a significant amount. The Company may settle certain U.S. tax examinations or have lapses in statute of limitations for different amounts than the Company has accrued as uncertain tax positions. The Company may need to accrue and ultimately pay additional amounts for tax positions that previously met a more likely than not standard if such positions are not upheld. Conversely, the Company could settle positions with the tax authorities for amounts lower than have been accrued or extinguish a position through payment. The Company believes the outcomes which are reasonably possible within the next 12 months may result in a reduction in the liability for uncertain tax positions in the range of approximately $4.8 million to $18.6 million, excluding interest and penalties.

Segment_Information

Segment Information	6 Months Ended
	Dec. 31, 2014
Segment Reporting [Abstract]
Segment Information	Segment Information.
	Towers Watson has four reportable operating segments or business areas:
	•	Benefits
	•	Risk and Financial Services
	•	Talent and Rewards
	•	Exchange Solutions
	Towers Watson’s chief operating decision maker is its chief executive officer. It was determined that Towers Watson operational data used by the chief operating decision maker is that of the segments. Management bases strategic goals and decisions on these segments and the data presented below is used to assess the adequacy of strategic decisions, the method of achieving these strategies and related financial results.
	Management evaluates the performance of its segments and allocates resources to them based on net operating income on a pre-bonus, pre-tax basis. Revenue includes amounts that were directly incurred on behalf of our clients and reimbursed by them (reimbursable expenses).
	On January 23, 2014, Towers Watson announced plans to expand the Exchange Solutions segment by combining operations and associates from the Health & Welfare practice of the Technology and Administration Solutions North America line of business, and certain associates from the Health and Group Benefits line of business with the Retiree & Access Exchanges line of business and the Liazon acquisition to better align their respective strategic goals. The restructuring took effect on July 1, 2014. We have reclassified certain portions of the revenue (net of reimbursable expenses) and net operating income previously reflected in the Benefits segment in the quarterly filing for the three and six months ended December 31, 2013 to conform to the current segment alignment within Exchange Solutions. The reorganization had no impact on the Risk and Financial Services and Talent and Rewards segments.
	The table below presents specified information about the continuing operations of the reported segments for the three months ended December 31, 2014:
		Benefits			Risk and			Talent and			Exchange			Total
					Financial Services			Rewards			Solutions
	Revenue (net of reimbursable expenses)	$	488,453		$	154,278		$	183,973		$	93,924		$	920,628
	Net operating income	175,023			41,744			67,568			12,462			296,797
	The table below presents specified information about the continuing operations of the reported segments for the three months ended December 31, 2013:
		Benefits			Risk and			Talent and			Exchange			Total
					Financial Services			Rewards			Solutions
	Revenue (net of reimbursable expenses)	$	456,840		$	161,178		$	170,323		$	66,233		$	854,574
	Net operating income	138,101			34,442			53,096			3,025			228,664
	The table below presents specified information about the continuing operations of the reported segments for the six months ended December 31, 2014:
		Benefits			Risk and			Talent and			Exchange			Total
					Financial Services			Rewards			Solutions
	Revenue (net of reimbursable expenses)	$	954,040		$	302,304		$	337,267		$	180,206		$	1,773,817
	Net operating income	330,782			77,305			104,411			26,474			538,972
	The table below presents specified information about the continuing operations of the reported segments for the six months ended December 31, 2013:
		Benefits			Risk and			Talent and			Exchange			Total
					Financial Services			Rewards			Solutions
	Revenue (net of reimbursable expenses)	$	888,095		$	302,961		$	323,892		$	127,397		$	1,642,345
	Net operating income	267,639			56,929			97,160			17,481			439,209
	The table below presents a reconciliation of the information reported by segment to the consolidated amounts reported from continuing operations for the three and six months ended December 31, 2014 and 2013:
		Three Months Ended						Six Months Ended
		December 31,						December 31,
		2014			2013			2014			2013
	Revenue:
	Total segment revenue	$	920,628		$	854,574		$	1,773,817		$	1,642,345
	Reimbursable expenses and other	37,294			33,581			62,212			55,749
	Revenue	$	957,922		$	888,155		$	1,836,029		$	1,698,094
	Net Operating Income:
	Total segment net operating income	$	296,797		$	228,664		$	538,972		$	439,209
	Differences in allocation methods (1)	11,672			6,869			27,384			16,855
	Amortization of intangibles	(17,279		)	(18,691		)	(34,816		)	(37,583		)
	Transaction and integration expenses	—			(808		)	—			(808		)
	Stock-based compensation (2)	(5,738		)	(1,782		)	(11,290		)	(5,345		)
	Discretionary compensation	(111,015		)	(74,085		)	(203,379		)	(150,207		)
	Payroll tax on discretionary compensation	(6,327		)	(4,075		)	(11,846		)	(8,643		)
	Other, net	(1,100		)	(7,666		)	(12,017		)	(22,631		)
	Income from operations	$	167,010		$	128,426		$	293,008		$	230,847
	________________________
	-1	Depreciation, general and administrative, pension, and medical costs are allocated to our segments based on budgeted expenses determined at the beginning of the fiscal year, as management believes that these costs are largely uncontrollable to the segment. To the extent that the actual expense base upon which allocations are made differs from the forecast/budget amount, a reconciling item will be created between internally allocated expenses and the actual expense that we report for GAAP purposes.
	-2	Stock-based compensation excludes RSUs granted in conjunction with our performance bonus, which are included in discretionary compensation, as well as LTIP awards granted to certain executives of our Exchange Solutions segment, which are included within the calculation of Exchange Solutions' net operating income.

Accounting_Policies_Policies

Accounting Policies (Policies)	6 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Recent Accounting Pronouncements	Recent Accounting Pronouncements.
	Not yet adopted
	On May 28, 2014, the Financial Accounting Standards Board ("FASB") and International Accounting Standards Board ("IASB") issued their final standard on revenue from contracts with customers. The standard, issued as Accounting Standards Update ("ASU") 2014-09 by the FASB, outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers, and supersedes most current revenue recognition guidance. The core principle of the revenue model is that an entity recognizes revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The ASU applies to all contracts with customers, except those that are within the scope of other topics in the FASB Accounting Standards Codification. Compared with current U.S. GAAP, the ASU also requires significantly expanded disclosures about revenue recognition. The ASU is effective for interim and annual reporting periods that begin after December 15, 2016, and early adoption is prohibited. The Company is currently evaluating the impact of adopting this provision.
	On June 19, 2014, the FASB issued ASU 2014-12, Accounting for Share-Based Payments When the Terms of an Award Provide a Performance Target Could Be Achieved After the Requisite Service Period. The update is intended to resolve the diverse accounting treatment of these types of awards in practice. The amendments require that a performance target that affects vesting and that could be achieved after the requisite service period be treated as a performance condition. A reporting entity should apply existing guidance in "Compensation - Stock Compensation (Topic 718)" as it relates to awards with performance conditions that affect vesting to account for such awards. As such, the performance target should not be reflected in estimating the grant-date fair value of the award. Compensation cost should be recognized in the period in which it becomes probable that the performance target will be achieved, and should represent the compensation cost attributable to the period(s) for which the requisite service has already been rendered. If the performance target becomes probable of being achieved before the end of the requisite service period, the remaining unrecognized compensation cost should be recognized prospectively over the remaining requisite service period. The ASU is effective for interim and annual reporting periods that begin after December 15, 2015. The Company does not expect the adoption of this pronouncement to have an impact on our financial statements as this guidance mirrors our existing policy for such share-based awards.
	Adopted
	On June 7, 2013, the FASB issued ASU 2013-08, “Financial Services – Investment Companies (Topic 946): Amendments to the Scope, Measurement, and Disclosure Requirements,” which amends the criteria an entity would need to meet to qualify as an investment company under Accounting Standards Codification ("ASC") 946. The ASU (1) introduces new disclosure requirements that apply to all investment companies and, (2) amends the measurement criteria for certain interests in other investment companies. The ASU also amends the requirements in ASC 810 related to qualifying for the “investment-company deferral” in ASU 2010-10, as well as the requirements in ASC 820 related to qualifying for the “net asset value practical expedient” in ASU 2009-12. We manage certain funds that are considered variable interest entities and for which our management fee is considered a variable interest. These funds qualify for the “investment-company deferral” in ASU 2010-10, and therefore are subject to the consolidation guidance prior to the issuance of ASU 2009-17. The ASU is effective for annual periods that begin after December 15, 2013 and interim periods within those annual periods. Early adoption is prohibited. The Company has evaluated whether these funds continued to qualify for the “investment-company deferral” based on the amended investment company criteria proscribed by ASU 2013-08 and concluded that there were no changes to the Company's original assessments. Therefore, there is no impact to the Company's financial statements or disclosures.
Fair Value Transfer Policy	The Company’s policy is to recognize transfers in and transfers out as of the beginning of the reporting period.

Acquisitions_and_Divestitures_

Acquisitions and Divestitures (Tables)	6 Months Ended
	Dec. 31, 2014
Business Combinations [Abstract]
Selected financial information relating to Brokerage business's operations	The following selected financial information relates to the Brokerage business’s operations for the three and six months ended December 31, 2013:
		Three Months Ended December 31, 2013			Six Months Ended December 31, 2013
	Revenue from discontinued operations	$	22,564		$	63,762
	Income from discontinued operations before taxes	9,894			24,398
	Tax expense on discontinued operations	3,692			8,801
	Net income from discontinued operations	$	6,202		$	15,597
	Gain from sale of discontinued operations	27,989			18,480
	Tax expense on gain from sale of discontinued operations	34,594			32,036
	Net loss from sale of discontinued operations	(6,605		)	(13,556		)
	Total net (loss)/income from discontinued operations	$	(403	)	$	2,041

Investments_Tables

Investments (Tables)	6 Months Ended
	Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]
Schedule of investments	Additional information on the Company's investments is provided in the following table as of December 31, 2014 and June 30, 2014:
		As of December 31, 2014									As of June 30, 2014
		Amortized		Unrealized		Unrealized			Estimated		Amortized		Unrealized		Unrealized			Estimated
		Cost		Gains		Losses			Fair Value		Cost		Gains		Losses			Fair Value
	Short Term Investments:
	Held-to-maturity:
	Term deposits & Certificates of deposits	$	18,623	$	—	$	—		$	18,623	$	107,556	$	—	$	—		$	107,556
	Fixed income securities	21,840		—		(97		)	21,743		—		—		—			—
	Available-for-sale:
	Equity securities	102		—		(13		)	89		126		7		(3		)	130
	Mutual funds and exchange-traded funds	4,999		2		(18		)	4,983		15,033		42		—			15,075
	Total Short-Term Investments:	45,564		2		(128		)	45,438		122,715		49		(3		)	122,761
	Other Assets:
	Available-for-sale:
	Mutual funds and exchange-traded funds	45,927		—		(718		)	45,209		42,147		451		—			42,598
	Total Investments in Other Assets	$	45,927	$	—	$	(718	)	$	45,209	$	42,147	$	451	$	—		$	42,598

Goodwill_and_Intangible_Assets1

Goodwill and Intangible Assets (Tables)	6 Months Ended
	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of goodwill	The components of goodwill are outlined below for the six months ended December 31, 2014:
		Benefits			Risk and			Talent and			Exchange			All Other		Total
					Financial			Rewards			Solutions
					Services
	Balance as of June 30, 2014	$	1,290,789		$	391,549		$	113,862		$	515,644		$	1,214	$	2,313,058
	Goodwill related to acquisitions	—			—			—			(1,255		)	—		(1,255		)
	Goodwill reallocated in segment restructuring	(54,052		)	—			—			54,052			—		—
	Translation adjustment	(83,203		)	(28,816		)	(7,353		)	—			—		(119,372		)
	Balance as of December 31, 2014	$	1,153,534		$	362,733		$	106,509		$	568,441		$	1,214	$	2,192,431
Schedule of changes in finite-lived intangible assets by major class	The following table reflects changes in the net carrying amount of the components of finite-lived intangible assets for the six months ended December 31, 2014:
		Customer			Core/			Favorable			Total
		related			developed			lease
		intangible			technology			agreements
	Balance as of June 30, 2014	$	198,855		$	75,827		$	2,617		$	277,299
	Amortization	(22,741		)	(12,075		)	(474		)	(35,290		)
	Translation adjustment	(7,612		)	(512		)	(17		)	(8,141		)
	Balance as of December 31, 2014	$	168,502		$	63,240		$	2,126		$	233,868
Schedule of finite-lived intangible assets by major class	The following table reflects the carrying value of finite-lived intangible assets and liabilities as of December 31, 2014 and June 30, 2014:
		As of December 31, 2014						As of June 30, 2014
		Gross			Accumulated			Gross			Accumulated
		Carrying			Amortization			Carrying			Amortization
		Amount						Amount
	Finite-lived intangible assets and liabilities:
	Trade name	$	520		$	520		$	520		$	520
	Customer related intangibles	371,767			203,265			391,201			192,346
	Core/developed technology	174,633			111,393			175,948			100,121
	Favorable lease agreements	6,407			4,281			6,488			3,871
	Total finite-lived intangible assets	$	553,327		$	319,459		$	574,157		$	296,858
	Unfavorable lease agreements	24,004			15,347			24,818			14,588
	Total finite-lived intangible liabilities	$	24,004		$	15,347		$	24,818		$	14,588
Schedule of rent offset, future amortization	The table below reflects the following for the remainder of fiscal 2015 and for subsequent fiscal years:
	1) Future estimated amortization expense for amortizable intangible assets consisting of customer related intangibles and core/developed technology, and
	2) The rent offset resulting from the amortization of the net lease intangible assets and liabilities:
	Fiscal year ending June 30,	Amortization			Rent (Offset)
					Expense
	2015	$	34,758		$	(907	)
	2016	55,319			(1,594		)
	2017	51,123			(1,867		)
	2018	41,175			(1,981		)
	2019	26,661			(315		)
	Thereafter	22,706			133
	Total	$	231,742		$	(6,531	)

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	6 Months Ended
	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Schedule of fair value, assets and liabilities measured on recurring basis	The following presents our assets and liabilities measured at fair value on a recurring basis at December 31, 2014 and June 30, 2014:
		Fair Value Measurements on a Recurring Basis at December 31, 2014
		Level 1			Level 2		Level 3		Total
	Assets:
	Available-for-sale securities:
	Equity securities	$	89		$	—	$	—	$	89
	Mutual funds / exchange traded funds	50,192			—		—		50,192
	Derivatives:
	Foreign exchange forwards (a)	—			2,000		—		2,000
	Liabilities:
	Derivatives:
	Foreign exchange forwards (a)	—			906		—		906
	Contingent Liabilities:
	Retention bonus liability (b)	—			—		9,914		9,914
		Fair Value Measurements on a Recurring Basis at June 30, 2014
		Level 1			Level 2		Level 3		Total
	Assets:
	Available-for-sale securities:
	Equity securities	$	130		$	—	$	—	$	130
	Mutual funds / exchange traded funds	57,673			—		—		57,673
	Derivatives:
	Foreign exchange forwards (a)	—			639		—		639
	Liabilities:
	Derivatives:
	Foreign exchange forwards (a)	—			550		—		550
	Contingent Liabilities:
	Retention bonus liability (b)	—			—		19,998		19,998
	_________________________
	(a)	These derivative investments are included in other current assets or accounts payable, accrued liabilities and deferred income on the accompanying condensed consolidated balance sheet. See Note 6 for further information on our derivative investments.
	(b)	This liability is included in other current liabilities and other noncurrent liabilities at June 30, 2014, and other current liabilities at December 31, 2014, on the accompanying condensed consolidated balance sheet. The fair value was determined using a discounted cash flow model.
Fair value measurements using significant unobservable inputs (level 3)
	Fair Value Measurements using significant unobservable inputs (Level 3):
	Beginning balance - June 30, 2014	$	(19,998	)
	Payments	10,338
	Unrealized gains/(losses)	(254		)
	Ending balance - December 31, 2014	$	(9,914	)

Derivative_Financial_Instrumen1

Derivative Financial Instruments (Tables)	6 Months Ended
	Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of derivative assets and liabilities at fair value	The fair value of our derivative instruments held as of December 31, 2014 and June 30, 2014 and their location in the condensed consolidated balance sheet are as follows:
		Derivative assets										Derivative liabilities
		Balance sheet		Fair value								Balance sheet		Fair value
		location										location
				31-Dec-14				30-Jun-14						31-Dec-14				30-Jun-14
	Derivatives designated as hedging instruments:
	Foreign exchange forwards	Other current assets		$	1,937			$	618			Accounts payable,		$	(255	)		$	(513	)
												accrued liabilities
												and deferred income
	Derivatives not designated as hedging instruments:
	Foreign exchange forwards	Other current assets		63				21				Accounts payable,		(651		)		(37		)
												accrued liabilities
												and deferred income
	Total derivative assets (liabilities)			$	2,000			$	639					$	(906	)		$	(550	)
Schedule of the effect of derivative instruments on statement of financial performance	The effects of derivative instruments that are designated as hedging instruments on the condensed consolidated statements of operations and the condensed consolidated statements of changes in stockholders’ equity for the three and six months ended December 31, 2014 and 2013 are as follows:
	Three Months Ended		Gain/(loss) recognized in OCI								Location		Gain/(loss) reclassified								Location of gain recognized in income	Gain recognized
	December 31,		(effective portion)								of gain/(loss) reclassified		from OCI into income								(ineffective portion and	in income (ineffective
											from OCI into income		(effective portion)								amount excluded from	portion and
											(effective portion)										effectiveness testing)	amount excluded from
																						effectiveness testing)
			2014				2013						2014				2013					2014		2013
	Foreign exchange forwards		$	589			$	(431	)		General and		$	437			$	(394	)		General and	$	38	$	2
											administrative										administrative
											expenses										expenses
	Total		$	589			$	(431	)				$	437			$	(394	)			$	38	$	2
	Six Months Ended		Gain/(loss) recognized in OCI								Location		Gain/(loss) reclassified								Location of gain recognized in income	Gain recognized
	December 31,		(effective portion)								of gain/(loss) reclassified		from OCI into income								(ineffective portion and	in income (ineffective
											from OCI into income		(effective portion)								amount excluded from	portion and
											(effective portion)										effectiveness testing)	amount excluded from
																						effectiveness testing)
			2014				2013						2014				2013					2014		2013
	Foreign exchange forwards		$	1,774			$	(2,062	)		General and		$	281			$	(332	)		General and	$	13	$	3
											administrative										administrative
											expenses										expenses
	Total		$	1,774			$	(2,062	)				$	281			$	(332	)			$	13	$	3
Schedule of other derivatives not designated as hedging instruments, Statements of financial performance and financial position	The effects of derivatives that have not been designated as hedging instruments on the condensed consolidated statements of operations for the three and six months ended December 31, 2014 and 2013 are as follows:
					(Loss)/gain recognized in income
					Three Months Ended								Six Months Ended
					December 31,								December 31,
	Derivatives not designated as hedging instruments:		Location of (loss)/gain		2014				2013				2014				2013
			recognized in income
	Foreign exchange forwards		General and administrative expenses		$	(796	)		$	(85	)		$	(2,691	)		$	520
	Total				$	(796	)		$	(85	)		$	(2,691	)		$	520

Retirement_Benefits_Tables

Retirement Benefits (Tables)	6 Months Ended
	Dec. 31, 2014
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]
Components of net periodic benefit cost for defined benefit pension plans	The following table sets forth the components of net periodic benefit cost for the Company’s defined benefit pension plan for North America and Europe for the three and six months ended December 31, 2014 and 2013:
		Three Months Ended December 31,
		2014						2013
		North			Europe			North			Europe
		America						America
	Service cost	$	17,683		$	3,190		$	17,538		$	3,074
	Interest cost	34,522			9,883			35,212			10,249
	Expected return on plan assets	(53,078		)	(12,533		)	(47,181		)	(11,532		)
	Amortization of net loss	4,573			3,123			5,475			2,250
	Amortization of prior service (credit)/cost	(2,095		)	10			(2,095		)	11
	Net periodic benefit cost	$	1,605		$	3,673		$	8,949		$	4,052
		Six Months Ended December 31,
		2014						2013
		North			Europe			North			Europe
		America						America
	Service cost	$	35,894		$	6,562		$	35,326		$	6,039
	Interest cost	69,153			20,318			70,566			20,096
	Expected return on plan assets	(106,368		)	(25,758		)	(94,407		)	(22,589		)
	Amortization of net loss	8,951			6,425			11,124			4,419
	Amortization of prior service (credit)/cost	(4,190		)	21			(4,189		)	21
	Net periodic benefit cost	$	3,440		$	7,568		$	18,420		$	7,986
Components of net periodic benefit cost for other postretirement plans	The following table sets forth the components of net periodic benefit cost for the Company’s post-retirement plans for the three and six months ended December 31, 2014 and 2013:
		Three Months Ended						Six Months Ended
		December 31,						December 31,
		2014			2013			2014			2013
	Service cost	$	320		$	366		$	641		$	734
	Interest cost	2,042			2,220			4,094			4,442
	Expected return on plan assets	(24		)	(28		)	(48		)	(56		)
	Amortization of net gain	(440		)	(433		)	(880		)	(863		)
	Amortization of prior service credit	(1,726		)	(1,751		)	(3,452		)	(3,503		)
	Net periodic benefit cost	$	172		$	374		$	355		$	754

Accumulated_Other_Comprehensiv1

Accumulated Other Comprehensive Income/(Loss) (Tables)	6 Months Ended
	Dec. 31, 2014
Equity [Abstract]
Schedule of Accumulated Other Comprehensive Income/(Loss)	The difference between the amounts presented in this table and the amounts presented in the condensed consolidated statements of comprehensive income are the corresponding components attributable to non-controlling interests, which are not material for further disclosure.
		Foreign			Hedge effectiveness (1)									Available-for-sale									Defined pension and
		currency												securities (2)									post-retirement benefit costs (3)
		translation
		-1			Before			Tax			After			Before			Tax			After			Before			Tax			After
					Tax						Tax			Tax						Tax			Tax						Tax
	As of June 30, 2014	$	2,271		$	144		$	(79	)	$	65		$	344		$	(114	)	$	230		$	(262,902	)	$	70,634		$	(192,268	)
	Other comprehensive income/(loss) before reclassifications	(184,302		)	1,774			(707		)	1,067			(282		)	98			(184		)	—			—			—
	Amounts reclassified from accumulated other comprehensive income	—			(281		)	112			(169		)	(35		)	—			(35		)	7,210			(1,491		)	5,719
	Net current-period other comprehensive income/(loss)	(184,302		)	1,493			(595		)	898			(317		)	98			(219		)	7,210			(1,491		)	5,719
	As of December 31, 2014	$	(182,031	)	$	1,637		$	(674	)	$	963		$	27		$	(16	)	$	11		$	(255,692	)	$	69,143		$	(186,549	)
	________________________
	-1	Reclassification adjustments from accumulated other comprehensive income are included in general and administrative expenses (see Note 6 – Derivative Financial Instruments for additional details regarding the reclassification adjustments for the hedge settlements)
	-2	Reclassification adjustments from accumulated other comprehensive income are included in general and administrative expenses
	-3	Reclassification adjustments from accumulated other comprehensive income are included in the computation of net periodic pension cost (see Note 7 – Retirement Benefits for additional details)

ShareBased_Compensation_Tables

Share-Based Compensation (Tables)	6 Months Ended
	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Restricted Stock Units	The following table presents key information with regard to each of the awards that had been granted as of December 31, 2014:
	Plan	Performance Period	RSUs Awarded	Grant Date Stock Price	Assumed Forfeiture Rate
	2015 LTIP	July 1, 2014 to June 30, 2017	76,202	$100.02	None
	2014 LTIP	July 1, 2013 to June 30, 2016	65,355	$105.90 and $110.70	None
	2013 LTIP	July 1, 2012 to June 30, 2015	121,075	$54.59	None
	2014 ES LTIP	July 1, 2013 to June 30, 2016	30,192	$91.43	None
	2014 SEP	July 1, 2014 to June 30, 2017	112,464	$106.89	5%
	2013 SEP	July 1, 2013 to June 30, 2016	131,286	$91.43	5%
	2012 SEP	July 1, 2012 to June 30, 2015	147,503	$53.93	5%

Segment_Information_Tables

Segment Information (Tables)	6 Months Ended
	Dec. 31, 2014
Segment Reporting [Abstract]
Schedule of segment information, by segment	The table below presents specified information about the continuing operations of the reported segments for the three months ended December 31, 2014:
		Benefits			Risk and			Talent and			Exchange			Total
					Financial Services			Rewards			Solutions
	Revenue (net of reimbursable expenses)	$	488,453		$	154,278		$	183,973		$	93,924		$	920,628
	Net operating income	175,023			41,744			67,568			12,462			296,797
	The table below presents specified information about the continuing operations of the reported segments for the three months ended December 31, 2013:
		Benefits			Risk and			Talent and			Exchange			Total
					Financial Services			Rewards			Solutions
	Revenue (net of reimbursable expenses)	$	456,840		$	161,178		$	170,323		$	66,233		$	854,574
	Net operating income	138,101			34,442			53,096			3,025			228,664
	The table below presents specified information about the continuing operations of the reported segments for the six months ended December 31, 2014:
		Benefits			Risk and			Talent and			Exchange			Total
					Financial Services			Rewards			Solutions
	Revenue (net of reimbursable expenses)	$	954,040		$	302,304		$	337,267		$	180,206		$	1,773,817
	Net operating income	330,782			77,305			104,411			26,474			538,972
	The table below presents specified information about the continuing operations of the reported segments for the six months ended December 31, 2013:
		Benefits			Risk and			Talent and			Exchange			Total
					Financial Services			Rewards			Solutions
	Revenue (net of reimbursable expenses)	$	888,095		$	302,961		$	323,892		$	127,397		$	1,642,345
	Net operating income	267,639			56,929			97,160			17,481			439,209
Schedule of reconciliation of segment information to the consolidated amounts	The table below presents a reconciliation of the information reported by segment to the consolidated amounts reported from continuing operations for the three and six months ended December 31, 2014 and 2013:
		Three Months Ended						Six Months Ended
		December 31,						December 31,
		2014			2013			2014			2013
	Revenue:
	Total segment revenue	$	920,628		$	854,574		$	1,773,817		$	1,642,345
	Reimbursable expenses and other	37,294			33,581			62,212			55,749
	Revenue	$	957,922		$	888,155		$	1,836,029		$	1,698,094
	Net Operating Income:
	Total segment net operating income	$	296,797		$	228,664		$	538,972		$	439,209
	Differences in allocation methods (1)	11,672			6,869			27,384			16,855
	Amortization of intangibles	(17,279		)	(18,691		)	(34,816		)	(37,583		)
	Transaction and integration expenses	—			(808		)	—			(808		)
	Stock-based compensation (2)	(5,738		)	(1,782		)	(11,290		)	(5,345		)
	Discretionary compensation	(111,015		)	(74,085		)	(203,379		)	(150,207		)
	Payroll tax on discretionary compensation	(6,327		)	(4,075		)	(11,846		)	(8,643		)
	Other, net	(1,100		)	(7,666		)	(12,017		)	(22,631		)
	Income from operations	$	167,010		$	128,426		$	293,008		$	230,847
	________________________
	-1	Depreciation, general and administrative, pension, and medical costs are allocated to our segments based on budgeted expenses determined at the beginning of the fiscal year, as management believes that these costs are largely uncontrollable to the segment. To the extent that the actual expense base upon which allocations are made differs from the forecast/budget amount, a reconciling item will be created between internally allocated expenses and the actual expense that we report for GAAP purposes.
	-2	Stock-based compensation excludes RSUs granted in conjunction with our performance bonus, which are included in discretionary compensation, as well as LTIP awards granted to certain executives of our Exchange Solutions segment, which are included within the calculation of Exchange Solutions' net operating income.

Organization_and_Basis_of_Pres1

Organization and Basis of Presentation (Details)	6 Months Ended
	Dec. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Current Fiscal Year End Date	-24

Acquisitions_and_Divestitures_1

Acquisitions and Divestitures (Acquisitions) (Details) (USD $)	6 Months Ended		0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Nov. 22, 2013
Business Acquisition [Line Items]
Cash paid	$1,255,000	$210,814,000
Liazon
Business Acquisition [Line Items]
Acquisition date			22-Nov-13
Name of acquired entity			Liazon
Cash paid			204,300,000
Stock based compensation awards assumed, fair value			8,000,000
Acquired Finite-Lived Intangibles			34,300,000
Net deferred tax asset			9,200,000
Consideration transferred			212,300,000
Goodwill acquired			$172,900,000

Acquisitions_and_Divestitures_2

Acquisitions and Divestitures (Divestitures) (Details) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Jun. 30, 2014
Discontinued Operations Disclosures
Proceeds from discontinued operations			$0	$256,953,000
Selected Income Statement Information
Revenue from discontinued operations		22,564,000		63,762,000
Income from discontinued operations before taxes		9,894,000		24,398,000
Tax expense on discontinued operations		3,692,000		8,801,000
Net income from discontinued operations		6,202,000		15,597,000
Gain from sale of discontinued operations		27,989,000		18,480,000
Tax expense on gain from sale of discontinued operations		34,594,000		32,036,000
Net loss from sale of discontinued operations		-6,605,000		-13,556,000
Total net (loss)/income from discontinued operations	0	-403,000	0	2,041,000
Final pre-tax gain on sale of business		27,989,000		18,480,000
Brokerage
Discontinued Operations Disclosures
Proceeds from discontinued operations		250,000,000
Segment disposal group belonged to		Risk and Financial Services segment
Branding transitional period (in months)		10 months
Elimination of intercompany transactions					2,800,000
Transitional services agreement term (in years)		2 years
Continuing cash flow after disposal		6,300,000
Repayment period of prepaid occupancy and infrastructure costs (in years)		2 years
Selected Income Statement Information
Gain from sale of discontinued operations					24,000,000
Adjustment to consideration for net assets transferred		31,400,000		31,400,000
Retention liability amount		21,700,000		21,700,000
Total consideration		215,100,000		215,100,000
Transaction costs		6,400,000
Final pre-tax gain on sale of business					$24,000,000
Alliance Agreement | Brokerage
Discontinued Operations Disclosures
Percentage of continuing cash flows after disposal		1.00%
Transitional Services Agreement | Brokerage
Discontinued Operations Disclosures
Percentage of continuing cash flows after disposal		7.40%

Investments_Additional_Disclos

Investments - Additional Disclosures (Details) (USD $)	6 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Proceeds from maturities of held-to-maturity securities	$214,510,000	$0
Proceeds from sale and maturity of available-for-sale securities	11,734,000	56,580,000
Fair value of investments in an unrealized loss position	70,300,000
Brokerage
Schedule of Available-for-sale Securities [Line Items]
Proceeds from sale and maturity of available-for-sale securities		$1,600,000

Investments_Details

Investments (Details) (USD $)	Dec. 31, 2014	Jun. 30, 2014
In Thousands, unless otherwise specified
Short-term investments
Available-for-sale and Held-to-maturity
Amortized cost	$45,564	$122,715
Unrealized gains	2	49
Unrealized losses	-128	-3
Estimated fair value	45,438	122,761
Short-term investments | Term deposits & Certificates of deposits
Held-to-maturity:
Amortized cost	18,623	107,556
Unrealized gains	0	0
Unrealized losses	0	0
Estimated fair value	18,623	107,556
Short-term investments | Fixed income securities
Held-to-maturity:
Amortized cost	21,840	0
Unrealized gains	0	0
Unrealized losses	-97	0
Estimated fair value	21,743	0
Short-term investments | Equity securities
Available-for-sale:
Amortized cost	102	126
Unrealized gains	0	7
Unrealized losses	-13	-3
Estimated Fair Value	89	130
Short-term investments | Mutual funds and exchange-traded funds
Available-for-sale:
Amortized cost	4,999	15,033
Unrealized gains	2	42
Unrealized losses	-18	0
Estimated Fair Value	4,983	15,075
Other assets
Available-for-sale:
Amortized cost	45,927	42,147
Unrealized gains	0	451
Unrealized losses	-718	0
Estimated Fair Value	45,209	42,598
Other assets | Mutual funds and exchange-traded funds
Available-for-sale:
Amortized cost	45,927	42,147
Unrealized gains	0	451
Unrealized losses	-718	0
Estimated Fair Value	$45,209	$42,598

Goodwill_and_Intangible_Assets2

Goodwill and Intangible Assets (Details) (USD $)	6 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014
Goodwill [Roll Forward]
Balance as of June 30, 2014	$2,313,058
Goodwill related to acquisitions	-1,255
Goodwill reallocated in segment restructuring	0
Translation adjustment	-119,372
Balance as of December 31, 2014	2,192,431
Benefits
Goodwill [Roll Forward]
Balance as of June 30, 2014	1,290,789
Goodwill related to acquisitions	0
Goodwill reallocated in segment restructuring	-54,052
Translation adjustment	-83,203
Balance as of December 31, 2014	1,153,534
Risk and Financial Services
Goodwill [Roll Forward]
Balance as of June 30, 2014	391,549
Goodwill related to acquisitions	0
Goodwill reallocated in segment restructuring	0
Translation adjustment	-28,816
Balance as of December 31, 2014	362,733
Talent and Rewards
Goodwill [Roll Forward]
Balance as of June 30, 2014	113,862
Goodwill related to acquisitions	0
Goodwill reallocated in segment restructuring	0
Translation adjustment	-7,353
Balance as of December 31, 2014	106,509
Exchange Solutions
Goodwill [Roll Forward]
Balance as of June 30, 2014	515,644
Goodwill related to acquisitions	-1,255
Goodwill reallocated in segment restructuring	54,052
Translation adjustment	0
Balance as of December 31, 2014	568,441
All Other
Goodwill [Roll Forward]
Balance as of June 30, 2014	1,214
Goodwill related to acquisitions	0
Goodwill reallocated in segment restructuring	0
Translation adjustment	0
Balance as of December 31, 2014	$1,214

Goodwill_and_Intangible_Assets3

Goodwill and Intangible Assets (Details1) (USD $)	3 Months Ended		6 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Jun. 30, 2014
Finite-Lived Intangible Assets [Roll Forward]
Balance as of June 30, 2014			$277,299,000
Amortization	-17,300,000	-18,700,000	-34,816,000	-38,022,000
Total intangible amortization and rent expense			-35,290,000
Translation adjustment			-8,141,000
Balance as of December 31, 2014	231,742,000		231,742,000
Balance as of December 31, 2014	233,868,000		233,868,000
Intangible Assets Other Disclosures [Abstract]
Indefinite-lived intangible assets (excluding goodwill)	370,700,000		370,700,000		380,000,000
Intangible Lease Liability	8,700,000		8,700,000		10,200,000
Reduction to rent expense			1,500,000
Finite-Lived Intangible Assets By Category [Abstract]
Gross carrying amount	553,327,000		553,327,000		574,157,000
Accumulated amortization	319,459,000		319,459,000		296,858,000
Gross carrying amount - intangible liabilities	24,004,000		24,004,000		24,818,000
Accumulated amortization - intangible liabilities	15,347,000		15,347,000		14,588,000
Weighted average remaining life of intangible assets and liabilities			4 years 8 months
Amortization
2015	34,758,000		34,758,000
2016	55,319,000		55,319,000
2017	51,123,000		51,123,000
2018	41,175,000		41,175,000
2019	26,661,000		26,661,000
Thereafter	22,706,000		22,706,000
Total	231,742,000		231,742,000
Rent (Offset) Expense
2015	-907,000		-907,000
2016	-1,594,000		-1,594,000
2017	-1,867,000		-1,867,000
2018	-1,981,000		-1,981,000
2019	-315,000		-315,000
Thereafter	133,000		133,000
Total	-6,531,000		-6,531,000
Customer related intangible
Finite-Lived Intangible Assets [Roll Forward]
Balance as of June 30, 2014			198,855,000
Amortization			-22,741,000
Translation adjustment			-7,612,000
Balance as of December 31, 2014	168,502,000		168,502,000
Finite-Lived Intangible Assets By Category [Abstract]
Gross carrying amount	371,767,000		371,767,000		391,201,000
Accumulated amortization	203,265,000		203,265,000		192,346,000
Amortization
Total	168,502,000		168,502,000
Core/developed technology
Finite-Lived Intangible Assets [Roll Forward]
Balance as of June 30, 2014			75,827,000
Amortization			-12,075,000
Translation adjustment			-512,000
Balance as of December 31, 2014	63,240,000		63,240,000
Finite-Lived Intangible Assets By Category [Abstract]
Gross carrying amount	174,633,000		174,633,000		175,948,000
Accumulated amortization	111,393,000		111,393,000		100,121,000
Amortization
Total	63,240,000		63,240,000
Favorable lease agreements
Finite-Lived Intangible Assets [Roll Forward]
Balance as of June 30, 2014			2,617,000
Rent expense for lease intangible			-474,000
Translation adjustment			-17,000
Balance as of December 31, 2014	2,126,000		2,126,000
Finite-Lived Intangible Assets By Category [Abstract]
Gross carrying amount	6,407,000		6,407,000		6,488,000
Accumulated amortization	4,281,000		4,281,000		3,871,000
Amortization
Total	2,126,000		2,126,000
Trade name
Finite-Lived Intangible Assets By Category [Abstract]
Gross carrying amount	520,000		520,000		520,000
Accumulated amortization	520,000		520,000		520,000
Unfavorable lease agreements
Finite-Lived Intangible Assets By Category [Abstract]
Gross carrying amount - intangible liabilities	24,004,000		24,004,000		24,818,000
Accumulated amortization - intangible liabilities	$15,347,000		$15,347,000		$14,588,000

Fair_Value_Measurements_Detail

Fair Value Measurements (Details) (USD $)	3 Months Ended		6 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Jun. 30, 2014
Unrealized Gain (Loss) on Derivatives recognized in earnings [Abstract]
Unrealized gain (loss) on derivatives recognized in earnings	$500,000	$300,000	$400,000	$900,000
Recurring
Liabilities:
Retention bonus liability	9,914,000		9,914,000		19,998,000
Recurring | Equity securities
Assets:
Available-for-sale securities	89,000		89,000		130,000
Recurring | Mutual funds and exchange-traded funds
Assets:
Available-for-sale securities	50,192,000		50,192,000		57,673,000
Recurring | Level 1
Liabilities:
Retention bonus liability	0		0		0
Recurring | Level 1 | Equity securities
Assets:
Available-for-sale securities	89,000		89,000		130,000
Recurring | Level 1 | Mutual funds and exchange-traded funds
Assets:
Available-for-sale securities	50,192,000		50,192,000		57,673,000
Recurring | Level 2
Liabilities:
Retention bonus liability	0		0		0
Recurring | Level 2 | Equity securities
Assets:
Available-for-sale securities	0		0		0
Recurring | Level 2 | Mutual funds and exchange-traded funds
Assets:
Available-for-sale securities	0		0		0
Recurring | Level 3
Liabilities:
Retention bonus liability	9,914,000		9,914,000		19,998,000
Recurring | Level 3 | Equity securities
Assets:
Available-for-sale securities	0		0		0
Recurring | Level 3 | Mutual funds and exchange-traded funds
Assets:
Available-for-sale securities	0		0		0
Foreign exchange forwards | Recurring
Assets:
Derivatives	2,000,000		2,000,000		639,000
Liabilities:
Derivatives	906,000		906,000		550,000
Foreign exchange forwards | Recurring | Level 1
Assets:
Derivatives	0		0		0
Liabilities:
Derivatives	0		0		0
Foreign exchange forwards | Recurring | Level 2
Assets:
Derivatives	2,000,000		2,000,000		639,000
Liabilities:
Derivatives	906,000		906,000		550,000
Foreign exchange forwards | Recurring | Level 3
Assets:
Derivatives	0		0		0
Liabilities:
Derivatives	$0		$0		$0

Fair_Value_Measurements_Level_

Fair Value Measurements - Level 3 Financial Instruments (Details) (Deferred bonus, USD $)	6 Months Ended
	Dec. 31, 2014
Fair Value Measurements using significant unobservable inputs (Level 3):
Beginning balance	($19,998,000)
Payments	10,338,000
Unrealized gains/(losses)	-254,000
Ending balance	-9,914,000
Level 3
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Credit adjusted interest rate (percentage)	1.80%
Forfeiture rate (percentage)	7.00%
Minimum | Level 3
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Credit adjusted interest rate (percentage)	0.50%
Forfeiture rate (percentage)	5.00%
Resulting values from changes in valuation inputs	10,000,000
Maximum | Level 3
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Credit adjusted interest rate (percentage)	10.00%
Forfeiture rate (percentage)	10.00%
Resulting values from changes in valuation inputs	9,200,000
Recurring | Minimum | Level 3
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Resulting values from changes in valuation inputs	10,100,000
Recurring | Maximum | Level 3
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Resulting values from changes in valuation inputs	$9,600,000

Derivative_Financial_Instrumen2

Derivative Financial Instruments (Details) (USD $)	6 Months Ended
	Dec. 31, 2014	Jun. 30, 2014
Derivatives, Fair Value [Line Items]
Longest outstanding maturity for derivative contracts at the most recent balance sheet date	15 months
Pretax gain deferred in accumulated other comprehensive income	$1,700,000
Derivative, fair value, net	1,100,000	100,000
Asset derivatives
Derivative assets	2,000,000	639,000
Liability derivatives
Derivative liabilities	-906,000	-550,000
Designated as hedging
Derivatives, Fair Value [Line Items]
Derivative, notional amount	62,200,000	49,500,000
Not designated as hedging
Derivatives, Fair Value [Line Items]
Derivative, notional amount	25,300,000	24,200,000
Foreign exchange forwards | Designated as hedging | Other current assets
Asset derivatives
Derivative assets	1,937,000	618,000
Foreign exchange forwards | Designated as hedging | Accounts payable, accrued liabilities and deferred income
Liability derivatives
Derivative liabilities	-255,000	-513,000
Foreign exchange forwards | Not designated as hedging | Other current assets
Asset derivatives
Derivative assets	63,000	21,000
Foreign exchange forwards | Not designated as hedging | Accounts payable, accrued liabilities and deferred income
Liability derivatives
Derivative liabilities	($651,000)	($37,000)

Derivative_Financial_Instrumen3

Derivative Financial Instruments (Details 2) (Foreign exchange forwards, Cash flow hedges, USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Summary Of Hedged Derivative Instruments Impact On Results Of Operations [Abstract]
Gain/(loss) recognized in OCI (effective portion)	$589	($431)	$1,774	($2,062)
General and administrative expenses
Summary Of Hedged Derivative Instruments Impact On Results Of Operations [Abstract]
Gain/(loss) reclassified from OCI into income (effective portion)	437	-394	281	-332
Gain recognized in income (ineffective portion and amount excluded from effectiveness testing)	38	2	13	3
Summary Of Non Hedged Derivative Instruments Impact On Results Of Operations [Abstract]
(Loss)/gain recognized in income	($796)	($85)	($2,691)	$520

Retirement_Benefits_Details

Retirement Benefits (Details) (USD $)	3 Months Ended		6 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Jun. 30, 2014
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]
Percent of pension and other post-retirement benefit obligations disclosed					98.00%
Percent of unfunded defined benefit pension plans in other countries					2.00%
U.S. defined contribution plans
Defined Contributions Plans
Company contribution costs recognized	$6,500,000	$7,500,000	$11,100,000	$13,500,000
U.K. defined contribution plans
Defined Contributions Plans
Company contribution costs recognized	4,900,000	4,100,000	9,900,000	9,900,000
North America pension plans
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	17,683,000	17,538,000	35,894,000	35,326,000
Interest cost	34,522,000	35,212,000	69,153,000	70,566,000
Expected return on plan assets	-53,078,000	-47,181,000	-106,368,000	-94,407,000
Amortization of net loss	4,573,000	5,475,000	8,951,000	11,124,000
Amortization of prior service (credit)/cost	-2,095,000	-2,095,000	-4,190,000	-4,189,000
Net periodic benefit cost	1,605,000	8,949,000	3,440,000	18,420,000
Employer Contributions
Company contributions			31,100,000
Estimated future company contributions			4,900,000
European pension plan
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	3,190,000	3,074,000	6,562,000	6,039,000
Interest cost	9,883,000	10,249,000	20,318,000	20,096,000
Expected return on plan assets	-12,533,000	-11,532,000	-25,758,000	-22,589,000
Amortization of net loss	3,123,000	2,250,000	6,425,000	4,419,000
Amortization of prior service (credit)/cost	10,000	11,000	21,000	21,000
Net periodic benefit cost	3,673,000	4,052,000	7,568,000	7,986,000
Employer Contributions
Company contributions			31,300,000
Estimated future company contributions			15,300,000
Other postretirement plans
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	320,000	366,000	641,000	734,000
Interest cost	2,042,000	2,220,000	4,094,000	4,442,000
Expected return on plan assets	-24,000	-28,000	-48,000	-56,000
Amortization of net loss	-440,000	-433,000	-880,000	-863,000
Amortization of prior service (credit)/cost	-1,726,000	-1,751,000	-3,452,000	-3,503,000
Net periodic benefit cost	$172,000	$374,000	$355,000	$754,000

Debt_Commitments_and_Contingen1

Debt, Commitments and Contingent Liabilities (Summary of Long-Term Debt) (Details) (USD $)	0 Months Ended	6 Months Ended	0 Months Ended
	Nov. 07, 2011	Dec. 31, 2014	Jun. 01, 2012	Dec. 31, 2013
Senior credit facility
Debt Instrument [Line Items]
Line of credit facility, expiration period	5 years
Line of credit maximum borrowing capacity	$500,000,000
Line of credit additional borrowing capacity	250,000,000
Line of credit, interest rate description	a spread to either LIBOR or the Prime Rate
Weighted average interest rate (percent)		1.40%		1.98%
Line of credit commitment fee (percent)		0.18%
Line of credit collateral description		Towers Watson and all of its domestic subsidiaries (other than Professional Consultants Insurance Company (“PCIC”), a majority-owned captive insurance company, and Stone Mountain Insurance Company (“SMIC”), a wholly-owned captive insurance company).
Line of credit covenant compliance		As of December 31, 2014, we were in compliance with our covenants.
Line of credit amount outstanding		50,000,000
Term loan
Debt Instrument [Line Items]
Weighted average interest rate (percent)		1.40%		1.43%
Term of debt instrument			5 years
Original amount borrowed			250,000,000
Debt periodic principal payment		6,300,000
Term loan		212,500,000
Captive insurance companies | Standby letters of credit
Debt Instrument [Line Items]
Line of credit amount outstanding		21,400,000
Other existing or potential business obligations | Standby letters of credit
Debt Instrument [Line Items]
Line of credit amount outstanding		$800,000
LIBOR | Minimum | Term loan
Debt Instrument [Line Items]
Percentage spread to base index rate			1.25%
LIBOR | Maximum | Term loan
Debt Instrument [Line Items]
Percentage spread to base index rate			1.75%
Bank base rate | Minimum | Term loan
Debt Instrument [Line Items]
Percentage spread to base index rate			0.25%
Bank base rate | Maximum | Term loan
Debt Instrument [Line Items]
Percentage spread to base index rate			0.75%

Debt_Commitments_and_Contingen2

Debt, Commitments and Contingent Liabilities (Summary of Malpractice Insurance) (Details) (USD $)	6 Months Ended
	Dec. 31, 2014	Jun. 30, 2014
Malpractice Insurance [Line Items]
Professional liability claims reserve incurred by not reported	$181,200,000	$173,800,000
Aggregate claims
Malpractice Insurance [Line Items]
Malpractice insurance deductible	10,000,000
Per claim
Malpractice Insurance [Line Items]
Malpractice insurance deductible	1,000,000
SMIC
Malpractice Insurance [Line Items]
Malpractice insurance, maximum coverage per incident	40,000,000
Captive insurance reinsurance coverage	25,000,000
Captive insurance coverage amount	15,000,000
Malpractice insurance, coverage floor	25,000,000
PCIC
Malpractice Insurance [Line Items]
Malpractice insurance deductible	1,000,000
Malpractice insurance, maximum coverage per incident	50,000,000
Captive insurance reinsurance coverage	25,000,000
Captive insurance coverage amount	$25,000,000
Malpractice insurance percentage of ownership in captive insurer	72.86%

Debt_Commitments_and_Contingen3

Debt, Commitments and Contingent Liabilities (Summary of Litigation) (Details)	0 Months Ended	1 Months Ended		3 Months Ended	51 Months Ended		1 Months Ended
	Oct. 23, 2014	Apr. 30, 2000	Feb. 29, 2000	Apr. 30, 2000	Oct. 31, 2012	Aug. 31, 2008	Feb. 05, 2015
	Pending litigation	Pending litigation	Pending litigation	Pending litigation	Letter of Claim [Member]	Letter of Claim [Member]	Subsequent Event [Member]
	Teck Metals, Ltd.	City of Houston	City of Houston	City of Houston	Currency hedge	Currency hedge	Violation of ERISA [Member]
	plaintiff	report	report	report	Trustee of the British Coal Staff Superannuation Scheme	Trustee of the British Coal Staff Superannuation Scheme	Meriter Health Services [Member]
					GBP (£)	GBP (£)	USD ($)
Loss Contingencies [Line Items]
Number of plaintiffs	436
Number of reports issued		1	1	2
Derivative, amount of hedged item						£ 250,000,000
Quantified loss on derivative					47,500,000
Litigation settlement amount							$82,000,000

Variable_Interest_Entities_Det

Variable Interest Entities (Details) (USD $)	Dec. 31, 2014
In Billions, unless otherwise specified
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Assets under management	$4

Accumulated_Other_Comprehensiv2

Accumulated Other Comprehensive Income/(Loss) (Details) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
After tax - AOCI
After tax - Accumulated OCI as of			($189,702)
Other comprehensive (loss)/income before non-controlling interests	-76,673	21,268	-178,451	94,458
After tax - Accumulated OCI as of	-367,606		-367,606
Foreign currency translation
After tax - AOCI
After tax - Accumulated OCI as of			2,271
After tax - Other comprehensive income/(loss) before reclassifications			-184,302
After tax - Amounts reclassified from accumulated other comprehensive income			0
Other comprehensive (loss)/income before non-controlling interests			-184,302
After tax - Accumulated OCI as of	-182,031		-182,031
Hedge effectiveness
Before tax - AOCI
Before tax - Accumulated OCI as of			144
Before tax - Other comprehensive income/(loss) before reclassifications			1,774
Before tax - Amounts reclassified from accumulated other comprehensive income			-281
Before tax - Net current-period other comprehensive income			1,493
Before tax - Accumulated OCI as of	1,637		1,637
Tax - AOCI
Tax - Accumulated OCI as of			-79
Tax - Other comprehensive income/(loss) before reclassifications			-707
Tax - Amounts reclassified from accumulated other comprehensive income			112
Tax - Net current-period other comprehensive income			-595
Tax - Accumulated OCI as of	-674		-674
After tax - AOCI
After tax - Accumulated OCI as of			65
After tax - Other comprehensive income/(loss) before reclassifications			1,067
After tax - Amounts reclassified from accumulated other comprehensive income			-169
Other comprehensive (loss)/income before non-controlling interests			898
After tax - Accumulated OCI as of	963		963
Available-for-sale securities
Before tax - AOCI
Before tax - Accumulated OCI as of			344
Before tax - Other comprehensive income/(loss) before reclassifications			-282
Before tax - Amounts reclassified from accumulated other comprehensive income			-35
Before tax - Net current-period other comprehensive income			-317
Before tax - Accumulated OCI as of	27		27
Tax - AOCI
Tax - Accumulated OCI as of			-114
Tax - Other comprehensive income/(loss) before reclassifications			98
Tax - Amounts reclassified from accumulated other comprehensive income			0
Tax - Net current-period other comprehensive income			98
Tax - Accumulated OCI as of	-16		-16
After tax - AOCI
After tax - Accumulated OCI as of			230
After tax - Other comprehensive income/(loss) before reclassifications			-184
After tax - Amounts reclassified from accumulated other comprehensive income			-35
Other comprehensive (loss)/income before non-controlling interests			-219
After tax - Accumulated OCI as of	11		11
Defined pension and post-retirement benefit costs
Before tax - AOCI
Before tax - Accumulated OCI as of			-262,902
Before tax - Other comprehensive income/(loss) before reclassifications			0
Before tax - Amounts reclassified from accumulated other comprehensive income			7,210
Before tax - Net current-period other comprehensive income			7,210
Before tax - Accumulated OCI as of	-255,692		-255,692
Tax - AOCI
Tax - Accumulated OCI as of			70,634
Tax - Other comprehensive income/(loss) before reclassifications			0
Tax - Amounts reclassified from accumulated other comprehensive income			-1,491
Tax - Net current-period other comprehensive income			-1,491
Tax - Accumulated OCI as of	69,143		69,143
After tax - AOCI
After tax - Accumulated OCI as of			-192,268
After tax - Other comprehensive income/(loss) before reclassifications			0
After tax - Amounts reclassified from accumulated other comprehensive income			5,719
Other comprehensive (loss)/income before non-controlling interests			5,719
After tax - Accumulated OCI as of	($186,549)		($186,549)

ShareBased_Compensation_Restri

Share-Based Compensation (Restricted Stock Units) (Details) (USD $)	6 Months Ended	3 Months Ended		6 Months Ended	12 Months Ended		1 Months Ended	3 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2013	Jun. 30, 2014	Jun. 30, 2013	Nov. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Description of Restricted Stock Units	RSUs are designed to provide us an opportunity to offer our long-term incentive program ("LTIP") and to provide key executives with a long-term stake in our success. RSUs are notional, non-voting units of measurement based on our common stock.
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Retirement age (in years)	55
Years of experience (in years)	15 years
Minimum years of service during performance period (in years)	1 year
RSU's vesting based on performance metrics, performance period	3 years
Vesting period	3 years
Restricted Stock Units | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of target number of units vesting based on performance metrics	0.00%
Restricted Stock Units | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of target number of units vesting based on performance metrics	204.00%
LTIP, SEP, and Other Plans [Member] | Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense (reversal)	16.1	$6.10	$3.60	$9.10
2015 LTIP | Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSU's awarded (in shares)	76,202
Grant Date Stock Price (in dollars per share)	100.02
2014 LTIP | Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSU's awarded (in shares)					65,355
2014 LTIP | Restricted Stock Units | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant Date Stock Price (in dollars per share)					105.9
2014 LTIP | Restricted Stock Units | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant Date Stock Price (in dollars per share)					110.7
2013 LTIP | Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSU's awarded (in shares)						121,075
Grant Date Stock Price (in dollars per share)						$54.59
2014 ES LTIP | Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSU's awarded (in shares)					30,192
Grant Date Stock Price (in dollars per share)					91.43
2014 ES LTIP | Restricted Stock Units | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of target number of units vesting based on performance metrics	0.00%
2014 ES LTIP | Restricted Stock Units | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of target number of units vesting based on performance metrics	240.00%
2014 SEP | Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSU's awarded (in shares)	112,464
Grant Date Stock Price (in dollars per share)	106.89
Forfeiture rate	5.00%
2013 SEP | Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSU's awarded (in shares)					131,286
Grant Date Stock Price (in dollars per share)					91.43
Forfeiture rate					5.00%
2012 SEP | Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSU's awarded (in shares)						147,503
Grant Date Stock Price (in dollars per share)						$53.93
Forfeiture rate						5.00%
Liazon RSUs | Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSU's awarded (in shares)							70,533
Stock based compensation awards assumed, fair value							5.7
Unvested awards acquired, fair value							2.1
Outside Directors | Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSU's awarded (in shares)								8,059	10,251
Compensation expense (reversal)	0.7	$0.30	$0.20	$0.70

ShareBased_Compensation_Stock_

Share-Based Compensation (Stock Options) (Details) (USD $)	1 Months Ended		3 Months Ended		6 Months Ended
In Millions, except Share data, unless otherwise specified	Nov. 30, 2013	31-May-12	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Liazon Vested Options
Stock Options Explanatory Disclosures [Line Items]
Options granted previously and assumed by a business acquirer	37,162
Fair value of vested stock options acquired	$2.20
Liazon Unvested Options
Stock Options Explanatory Disclosures [Line Items]
Fair value of vested stock options acquired	1.7
Extend Health Vested Options
Stock Options Explanatory Disclosures [Line Items]
Options granted previously and assumed by a business acquirer		377,614
Fair value of vested stock options acquired		11.2
Extend Health Unvested Options
Stock Options Explanatory Disclosures [Line Items]
Fair value of vested stock options acquired		7.9
Forfeiture rate		10.00%
Compensation expense			$0.90	$0.80	$1.60	$1.30

Income_Taxes_Details

Income Taxes (Details) (USD $)	3 Months Ended		6 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Income tax expense (benefit)	$55,372,000	$42,283,000	$99,434,000	$57,091,000
Effective tax rate			34.10%	24.50%
Uncertain tax positions, tax rate impact, benefit				7.30%
Change in tax rate, tax rate impact, benefit				1.60%
Unrecognized Tax Benefits	36,800,000		36,800,000
Significant change in unrecognized tax benefits is reasonably possible, estimated range of change, lower bound	4,800,000		4,800,000
Significant change in unrecognized tax benefits is reasonably possible, estimated range of change, upper bound	$18,600,000		$18,600,000

Segment_Information_Details

Segment Information (Details) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
			segment
Segment Reporting Information [Line Items]
Number of reportable operating segments			4
Revenue (net of reimbursable expenses)	$920,628	$854,574	$1,773,817	$1,642,345
Net operating income	296,797	228,664	538,972	439,209
Benefits
Segment Reporting Information [Line Items]
Revenue (net of reimbursable expenses)	488,453	456,840	954,040	888,095
Net operating income	175,023	138,101	330,782	267,639
Risk and Financial Services
Segment Reporting Information [Line Items]
Revenue (net of reimbursable expenses)	154,278	161,178	302,304	302,961
Net operating income	41,744	34,442	77,305	56,929
Talent and Rewards
Segment Reporting Information [Line Items]
Revenue (net of reimbursable expenses)	183,973	170,323	337,267	323,892
Net operating income	67,568	53,096	104,411	97,160
Exchange Solutions
Segment Reporting Information [Line Items]
Revenue (net of reimbursable expenses)	93,924	66,233	180,206	127,397
Net operating income	$12,462	$3,025	$26,474	$17,481

Segment_Information_Details_1

Segment Information (Details 1) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Revenue:
Total segment revenue	$920,628	$854,574	$1,773,817	$1,642,345
Reimbursable expenses and other	37,294	33,581	62,212	55,749
Revenue	957,922	888,155	1,836,029	1,698,094
Net Operating Income:
Total segment net operating income	296,797	228,664	538,972	439,209
Differences in allocation methods	11,672	6,869	27,384	16,855
Amortization of intangibles	-17,279	-18,691	-34,816	-37,583
Transaction and integration expenses	0	-808	0	-808
Stock-based compensation	-5,738	-1,782	-11,290	-5,345
Discretionary compensation	-111,015	-74,085	-203,379	-150,207
Payroll tax on discretionary compensation	-6,327	-4,075	-11,846	-8,643
Other, net	-1,100	-7,666	-12,017	-22,631
Income from operations	$167,010	$128,426	$293,008	$230,847