2.2.0.25falsefalse0220 - Disclosure - JOINT VENTURE WITH ACStruefalsefalse1falsefalseUSDfalsefalse4/1/2010 - 3/31/2011 USD ($) USD ($) / shares $TwelveMonthsEnded_31Mar2011http://www.sec.gov/CIK0001356570duration2010-04-01T00:00:002011-03-31T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDEPSDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0USDUSD$2true0wns_JointVentureWithOtherCompaniesAbstractwnsfalsenadurationJoint Venture With Other Companies.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringJoint Venture With Other Companies.falsefalseJOINT VENTURE WITH ACS [Abstract]3false0wns_RedeemableNonControllingInterestDisclosureTextBlockwnsfalsenadurationDescription of redeemable noncontrolling interest in consolidated subsidiaries which could include the name of the...falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00   <div style="font-family: 'Times New Roman',Times,serif"> <div align="left" style="font-size: 10pt; margin-top: 12pt"><b>20. JOINT VENTURE WITH ACS</b> </div> <div align="left" style="font-size: 10pt; margin-top: 6pt">In April 2008, the Company formed a joint venture, WNS Philippines, with Advanced Contact Solutions, Inc. (“ACS”), a BPO services and customer care provider, in the Philippines. ACS has assigned its rights and obligations under the joint venture agreement in favour of its holding company Paxys Inc. Philippines (“Paxys”). This joint venture is majority owned by the Company (65%) and the balance by Paxys. This joint venture offers contact center services to global clients across industries. This joint venture enables the Company to bring a large scale talent pool to help solve the business challenges of its clients while diversifying the geographic concentration of delivery. Pursuant to the joint venture agreement, the Company has a call option to acquire from Paxys the remaining shares owned by Paxys and Paxys has a put option to sell all of its shareholding in the joint venture to the Company, upon the occurrence of certain conditions, as set forth in the joint venture agreement, or after August 6, 2012. The Company accounts for securities with redemption features that are not solely within its control in accordance with ASC 480-10 “<i>Distinguishing Liabilities from Equity</i>”. Accordingly, as certain of the conditions of the put option and call option are not within the control of the Company, this redeemable noncontrolling interest has been classified as temporary equity. The Company recognizes changes in the redemption value of the redeemable noncontrolling interest immediately and adjusts the carrying value of the security to equal the redemption value at the end of each reporting period. Reductions in the carrying amount are only recorded to the extent that increases in the carrying amount had been previously recorded. The redeemable noncontrolling interest is first adjusted with its share of profits/losses in WNS Philippines and, to the extent that this is less than the redemption amount determined in accordance with ASC 480-10, the difference is charged to retained earnings. The charge to retained earnings does not affect net income attributable to WNS (Holdings) Limited shareholders’ in the Company’s income statement, but reduces the numerator in the calculation of earnings per share. The redeemable noncontrolling interest has been valued based on the terms of the call option, because the Company’s call option has priority over the put option. If, in the future, the redemption amount under the call option (which is based on a multiple of WNS Philippines’ net income) is greater than the put option (which is based on Paxys’ initial investment in WNS Philippines), the redeemable noncontrolling interest will be valued at the redemption amount under the put option. </div> <div align="left" style="font-size: 10pt; margin-top: 6pt">As at March 31, 2011 the carrying amount of the redeemable noncontrolling interest adjusted for its share of losses is less than the redemption amount by $355, which is charged to retained earnings. As at March 31, 2010 the carrying amount of the redeemable noncontrolling interest adjusted for its share of losses exceeds the redemption amount, and accordingly, no amount is charged to retained earnings. </div>   </div>  <div style="font-family: 'Times New Roman',Times,serif"> <div align="center" style="font-size: 10pt; margin-top: 0pt"> <b> </b> </div> </div>  <!-- Begin Block Tagged NotefalsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringDescription of redeemable noncontrolling interest in consolidated subsidiaries which could include the name of the subsidiary, the ownership percentage held by the parent, the ownership percentage held by the noncontrolling owners, the amount of the noncontrolling interest, the nature of the noncontrolling interest such as background information and terms, and the method of accounting for redemption features.No authoritative reference available.falsefalseJOINT VENTURE WITH ACS12JOINT VENTURE WITH ACSUnKnownUnKnownUnKnownUnKnownfalsetrue