Accounts Payable and Accrued Expenses (Details) (USD $)	12 Months Ended
	Jan. 31, 2012		Jan. 31, 2011		Jan. 31, 2010
Accounts Payable and Accrued Liabilities [Abstract]
Accrued compensation and benefits	$ 124,335,000		$ 137,025,000
Accounts payable	102,836,000		105,220,000
Accrued legal, audit and professional fees	16,087,000		26,824,000
Accrued taxes-other than income taxes	46,573,000		51,229,000
Accrued commissions	21,324,000		29,520,000
Accrued outside services-contractors	13,140,000		13,354,000
Accrued workforce reduction and restructuring	3,672,000		5,813,000
Accrued travel and entertainment	5,450,000		4,532,000
Accrued contingent consideration	10,152,000		2,194,000
Other accrued expenses	40,262,000	[1]	26,229,000	[1]
Accounts Payable and Accrued Liabilities, Current	383,831,000		401,940,000
Deferred compensation arrangement with individual, maximum employee subsciption rate	60.00%
Deferred compensation arrangement with individual, employer, contribution, percentage	50.00%
Deferred compensation arrangement with individual, employer contribution, maximum per employee	2,000
Deferred compensation arrangement with individual, employer contribution	$ 2,500,000		$ 2,500,000		$ 2,500,000

[1] Includes liabilities related to the Company’s 401(k) Plans.