Stock Option Plans - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2014
Stock Based Compensation [Line Items]
Compensation expense related to stock-based awards granted	$ 1,293	$ 1,298	$ 1,143
Weighted average grant-date fair value of options granted	$ 1.64	$ 6.23	$ 14.63
Associated excess tax (benefits) losses	$ (416)		$ (5)
Contractual term of stock options granted and outstanding			5 years 7 months 13 days
Intrinsic value of options exercised		$ 509
Fair value of options vested	$ 1,500	$ 1,200	$ 601
Options vested	272,000
Number of options exercised	0
Total unrecognized compensation expense related to unvested stock options	$ 1,000
Expense expected to be recognized over weighted average period	1 year 7 months 6 days
Restricted Stock [Member]
Stock Based Compensation [Line Items]
Expense expected to be recognized over weighted average period	9 months 18 days
Total unrecognized compensation expense related to unvested restricted stock awards	$ 104,000
2006 Plan [Member]
Stock Based Compensation [Line Items]
Vesting period of stock options granted and outstanding	3 years
Contractual term of stock options granted and outstanding	10 years
Shares available for grant	138,000
1994 Plan [Member]
Stock Based Compensation [Line Items]
Vesting period of stock options granted and outstanding	3 years
Contractual term of stock options granted and outstanding	10 years
1998 Plan [Member]
Stock Based Compensation [Line Items]
Vesting period of stock options granted and outstanding	3 years
Contractual term of stock options granted and outstanding	10 years
2000 Plan [Member]
Stock Based Compensation [Line Items]
Vesting period of stock options granted and outstanding	3 years
Contractual term of stock options granted and outstanding	10 years
Director Plan [Member]
Stock Based Compensation [Line Items]
Vesting period of stock options granted and outstanding	1 year
Contractual term of stock options granted and outstanding	10 years