Changes in Accrued Special Charges (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	Oct. 31, 2011		Jan. 31, 2011
Restructuring and Related Cost [Abstract]
Accrued special charges ending balance	$ 4,604	[1]	$ 6,930
Long-term portion of accrued lease termination fees and other facility costs, net of sublease income	1,095
Short-term portion of accrued special charges	$ 3,509

[1] Of the $4,604 total accrued special charges as of October 31, 2011, $1,095 represented the long-term portion of accrued lease termination fees and other facility costs, net of sublease income. The remaining balance of $3,509 represented the short-term portion of accrued special charges.