Stock Based Compensation - Common and Preferred Stock Incentive Plans (Detail)	Jan. 31, 2014	Jan. 31, 2013
Schedule Of Stock Options [Line Items]
Outstanding	2,374,887	2,307,280
Preferred Stock [Member]
Schedule Of Stock Options [Line Items]
Authorized and Reserved	4,076,921
Outstanding	2,380,111
Available to Issue	480,979
Preferred Stock [Member] | 1999 Series G Convertible Preferred Nonqualified Stock Option Plan [Member]
Schedule Of Stock Options [Line Items]
Authorized and Reserved	384,615
Outstanding	2,820
Preferred Stock [Member] | 2005 Series G Convertible Preferred Stock Incentive Plan [Member]
Schedule Of Stock Options [Line Items]
Authorized and Reserved	1,846,153
Outstanding	1,278,627
Preferred Stock [Member] | 2007 Stock Incentive Plan [Member]
Schedule Of Stock Options [Line Items]
Authorized and Reserved	1,076,923
Outstanding	810,788
Preferred Stock [Member] | 2011 Stock Incentive Plan [Member]
Schedule Of Stock Options [Line Items]
Authorized and Reserved	769,230
Outstanding	287,876
Available to Issue	480,979