Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	0 Months Ended	3 Months Ended					9 Months Ended	12 Months Ended						3 Months Ended							3 Months Ended						0 Months Ended	3 Months Ended
	Jul. 13, 2011	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Sep. 30, 2012	Sep. 30, 2010	Sep. 30, 2012	Dec. 31, 2010	Dec. 31, 2007	Dec. 31, 2005	Dec. 31, 2004	Dec. 31, 2003	Dec. 31, 2002	Mar. 31, 2013 Fourth Quarter Twenty Eleven	Sep. 30, 2013 First Quarter Twenty Twelve	Dec. 31, 2009 Software Development Entity	Mar. 31, 2013 Mumbai Tax Exemption Period Entity	Mar. 31, 2012 Mumbai Completion of Tax Holiday Period Entity	Mar. 31, 2014 Minimum Alternate Tax (MAT)	Mar. 31, 2014 Other Disputes	Mar. 31, 2014 Certain Units In Sez First Five Years	Mar. 31, 2014 Certain Units In Sez Additional Two Years	Mar. 31, 2014 Certain Units In Sez Additional Three Years	Mar. 31, 2014 New Units In Sez First Five Years	Mar. 31, 2014 New Units In Sez Next Five Years	Mar. 31, 2014 New Units In Sez Another Five Years	Apr. 30, 2008 Three Units in Mumbai First Five Years	Mar. 31, 2013 Three Units in Mumbai First Five Years	Mar. 31, 2013 Unit in Chennai First Five Years
Income Taxes [Line Items]
Statutory rate		35.00%		35.00%
Income tax expense (benefit)		$ (1.2)
Expense reversed for accrued interest and penalties		0.17
Accrued interest and penalties related to unrecognized tax benefits		1.27	1.40
Income taxes paid against liabilities for unrecognized tax benefits		30.37	26.37
Unrecognized tax liability		34.37	30.22
Unrecognized tax benefits, tax disputes		1.59
Unrecognized tax benefits, potential tax disputes		3.32
Corporate income taxes, exemption percentage																					100.00%	50.00%	50.00%	100.00%	50.00%	50.00%	100.00%	50.00%	100.00%
Number of units																1	6	1
Exemption from corporate income taxes		10 years
Corporate income taxes, years		15 years
Unrecognized Indian income tax liabilities												4.87	4.87							1.62
Income tax liability recognized										0.76	0.76									0.83
Income tax adjustments provision reversal								0.33
Favorable adjustment upon review of tax liabilities							0.24
Branch Profit Tax (BPT)		15.00%
Accumulated deferred tax liability on BPT									1.73
Additional branch profit taxes if profits were not permanently invested		6.61
Accrued taxes, likely amount		232.2
Income tax audit, service tax objection amount			0.74		0.46	3.85
Service tax audit objection received	3.0
Closure of service tax audit objection amount		0.85
Received service tax refund														0.15	0.13
Service tax return with show cause notice		2.04
Service tax penalty and interest demanded by tax department		3.95
Interest percentage on service tax penalty		18.00%
Local tax expense		0.02
Local tax liability gross			4.5
Local tax liability net			2.9
Minimum alternate tax credit expiration period																			10 years
Minimum Alternate Tax Credit																			$ 22.11