Organization and Summary of Significant Accounting Policies - Restricted Stock and Options Outstanding Used in Per Share Calculations (Detail) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
Earnings Per Share Basic And Diluted [Abstract]
Stock options	389	505	618
Restricted stock	25	22	19
Total dilutive shares	414	527	637