Changes in Accrued Special Charges (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Apr. 30, 2012
Restructuring Reserve [Roll Forward]
Accrued special charges beginning balance	$ 6,479
Charges	1,147
Payments	(2,461)
Accrued special charges ending balance	5,165	[1]
Employee severance and related costs
Restructuring Reserve [Roll Forward]
Accrued special charges beginning balance	3,668
Charges	988
Payments	(2,326)
Accrued special charges ending balance	2,330	[1]
Other costs
Restructuring Reserve [Roll Forward]
Accrued special charges beginning balance	2,811
Charges	159
Payments	(135)
Accrued special charges ending balance	$ 2,835	[1]

[1] Of the $5,165 total accrued special charges as of April 30, 2012, $2,101 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 $3,064 represented the short-term portion of accrued special charges.