Income Taxes (Details) (USD $)	3 Months Ended		9 Months Ended		0 Months Ended
	Oct. 31, 2012	Oct. 31, 2011	Oct. 31, 2012	Oct. 31, 2011	Sep. 19, 2012 Starhome Disposition
Income Taxes [Line Items]
Income tax provision	$ 5,462,000	$ (4,317,000)	$ 25,950,000	$ 19,314,000
Effective tax rate (percent)			348.10%	(87.10%)
Deferred tax liability for investment in Verint	36,500,000		36,500,000
Tax indemnification receivable from Comverse Inc.	13,900,000		13,900,000
Increase in additional paid-in capital due to tax agreement with Comverse Inc.			(13,900,000)
Additional deferred tax asset and related valuation allowance					12,400,000
Decrease in unrecognized tax benefits			(281,400,000)
Unrecognized tax benefits, if recognized would impact effective tax rate	43,600,000		43,600,000
Amount unrecognized tax benefits could decrease in the next twelve months as a result of settlement of certain tax audits or lapses of statutes of limitation	3,800,000		3,800,000
Accrued interest and penalties	$ 18,400,000		$ 18,400,000