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, 2017	Jan. 31, 2016	Jan. 31, 2015
Earnings Per Share [Abstract]
Stock options	18	13	223
Restricted stock	44	46	26
Total dilutive shares	62	59	249