Special Charges - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Oct. 31, 2013		Jan. 31, 2013
Disclosure Special Charges Additional Information [Abstract]
Percentage of termination benefit paid during the period	75.00%
Accrued special charges ending balance	$ 8,365	[1]	$ 5,541
Long-term portion of accrued lease termination fees and other facility costs, net of sublease income	660
Short-term portion of accrued special charges	$ 7,705

[1] Of the $8,365 total accrued special charges as of October 31, 2013, $660 represents the long-term portion, which primarily includes accrued lease termination fees and other facility costs, net of sublease income and other long-term costs. The remaining balance of $7,705 represents the short-term portion of accrued special charges.