Changes in Accrued Special Charges (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2012		Jan. 31, 2011		Jan. 31, 2010
Restructuring and Related Cost [Abstract]
Accrued special charges beginning balance	$ 6,930	[1]	$ 9,024	[2]	$ 8,331
Charges	13,174		10,257		21,334
Payments	(13,625)		(12,351)		(20,641)
Accrued special charges ending balance	6,479	[3]	6,930	[1]	9,024	[2]
Employee severance and related costs
Restructuring and Related Cost [Abstract]
Accrued special charges beginning balance	2,664	[1]	2,616	[2]	3,183
Charges	8,437		6,114		10,713
Payments	(7,433)		(6,066)		(11,280)
Accrued special charges ending balance	3,668	[3]	2,664	[1]	2,616	[2]
Other costs
Restructuring and Related Cost [Abstract]
Accrued special charges beginning balance	4,266	[1]	6,408	[2]	5,148
Charges	4,737		4,143		10,621
Payments	(6,192)		(6,285)		(9,361)
Accrued special charges ending balance	$ 2,811	[3]	$ 4,266	[1]	$ 6,408	[2]

[1] Of the $6,930 total accrued special charges as of January 31, 2011, $1,201 represented the long-term portion of accrued lease termination fees and other facility costs, net of sublease income. The remaining balance of $5,729 represented the short-term portion of accrued special charges.

[2] Of the $9,024 total accrued special charges as of January 31, 2010, $1,515 represented the long-term portion of accrued lease termination fees and other facility costs, net of sublease income. The remaining balance of $7,509 represented the short-term portion of accrued special charges.

[3] Of the $6,479 total accrued special charges as of January 31, 2012, $2,173 represented the long-term portion of accrued lease termination fees and other facility costs, net of sublease income and other long-term costs. The remaining balance of $4,306 represented the short-term portion of accrued special charges.