Changes in Accrued Special Charges (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2012		Jan. 31, 2011		Jan. 31, 2010		Jan. 31, 2009
Restructuring and Related Cost [Abstract]
Accrued special charges ending balance	$ 6,479	[1]	$ 6,930	[2]	$ 9,024	[3]	$ 8,331
Long-term portion of accrued lease termination fees and other facility costs, net of sublease income	2,173		1,201		1,515
Short-term portion of accrued special charges	$ 4,306		$ 5,729		$ 7,509

[1] 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.

[2] 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.

[3] 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.