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, 2018	Jan. 31, 2017	Jan. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Stock options (in shares)	77	18	13
Restricted stock (in shares)	32	44	46
Total dilutive shares	109	62	59