Changes in Accrued Special Charges (Parenthetical) (Detail) (USD $) In Thousands	Jul. 31, 2011		Jan. 31, 2011
Restructuring and Related Cost [Abstract]
Accrued special charges ending balance	$ 6,083	[1]	$ 6,930
Long-term portion of accrued lease termination fees and other facility costs, net of sublease income	1,182
Short-term portion of accrued special charges	$ 4,901

[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.