Organization and Summary of Significant Accounting Policies - Restricted Stock and Options Outstanding Used in Per Share Calculations (Detail) - shares shares in Thousands	12 Months Ended
	Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2014
Earnings Per Share [Abstract]
Stock options	13	223	389
Restricted stock	46	26	25
Total dilutive shares	59	249	414