Changes in Accrued Special Charges (Detail) (USD $) In Thousands	6 Months Ended
	Jul. 31, 2011
Restructuring and Related Cost [Abstract]
Accrued special charges beginning balance	$ 6,930
Charges	6,224
Payments	(7,071)
Accrued special charges ending balance	6,083	[1]
Employee severance and related costs
Restructuring and Related Cost [Abstract]
Accrued special charges beginning balance	2,664
Charges	2,354
Payments	(3,080)
Accrued special charges ending balance	1,938	[1]
Excess leased facility costs
Restructuring and Related Cost [Abstract]
Accrued special charges beginning balance	1,930
Charges	454
Payments	(569)
Accrued special charges ending balance	1,815	[1]
Other costs
Restructuring and Related Cost [Abstract]
Accrued special charges beginning balance	2,336
Charges	3,416
Payments	(3,422)
Accrued special charges ending balance	$ 2,330	[1]

[1] Of the $6,083 total accrued special charges as of July 31, 2011, $1,182 represented the long-term portion of accrued lease termination fees and other facility costs, net of sublease income. The remaining balance of $4,901 represented the short-term portion of accrued special charges.