BUSINESS COMBINATIONS (Details) (USD $)			3 Months Ended	6 Months Ended			3 Months Ended	6 Months Ended			3 Months Ended	6 Months Ended		12 Months Ended
	Jul. 31, 2012	Jan. 31, 2012	Jul. 31, 2012 Vovici Corporation	Jul. 31, 2012 Vovici Corporation	Jul. 31, 2011 Vovici Corporation	Aug. 04, 2011 Vovici Corporation	Jul. 31, 2012 Global Management Technologies	Jul. 31, 2012 Global Management Technologies	Jul. 31, 2011 Global Management Technologies	Oct. 07, 2011 Global Management Technologies	Jul. 31, 2012 Other Business Combinations	Jul. 31, 2012 Other Business Combinations	Jul. 31, 2011 Other Business Combinations	Jan. 31, 2012 Other Business Combinations acquisition	Jul. 31, 2012 August 2011 Business Combination	Apr. 30, 2012 August 2011 Business Combination	Jan. 31, 2012 August 2011 Business Combination
BUSINESS COMBINATIONS
Number of additional business combinations														5
Combined consideration						$ 66,103,000				$ 36,600,000				$ 55,155,000
Fair value of contingent obligation						9,900,000				12,000,000				20,500,000
Potential additional cash payments to former shareholders, maximum						19,100,000				17,400,000				41,000,000
Number of business combinations for acquisition of assets														2
Expense (benefit) from change in fair value			(4,000,000)	(3,700,000)			(900,000)	(4,500,000)			300,000	600,000
Fair value of contingent consideration obligation			3,500,000	3,500,000			5,100,000	5,100,000			16,600,000	16,600,000
Payments to the respective former shareholders or asset owners											4,200,000
Transaction and related costs				200,000	1,300,000			300,000	100,000		300,000	600,000	1,500,000
Goodwill associated with certain other business combinations	825,069,000	828,758,000									16,500,000	16,500,000		21,400,000
Estimated amount of deductible goodwill											6,400,000	6,400,000
Estimated amount of goodwill which is not tax deductible											10,100,000	10,100,000
Current liabilities associated with preacquisition business activities															3,200,000	3,600,000	4,000,000
Long-term liabilities associated with preacquisition business activities															$ 3,900,000	$ 4,300,000	$ 4,700,000