Stock Option Plans - Additional Information (Detail) - USD ($)	12 Months Ended
	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
Stock Based Compensation [Line Items]
Compensation expense related to stock-based awards granted	$ 737,000	$ 1,300,000	$ 1,300,000
Weighted average grant-date fair value of options granted		$ 1.64	$ 6.23
Number of options granted	0
Associated excess tax (benefits) losses	$ 0	$ (416,000)	$ 0
Intrinsic value of options exercised			509,000
Fair value of options vested	$ 1,000,000	$ 1,500,000	$ 1,200,000
Options vested	315,000
Number of options exercised	0	0
Total unrecognized compensation expense related to unvested stock options	$ 356,000
Expense expected to be recognized over weighted average period	1 year 1 month 6 days
Restricted Stock [Member]
Stock Based Compensation [Line Items]
Expense expected to be recognized over weighted average period	7 months 6 days
Total unrecognized compensation expense related to unvested restricted stock awards	$ 19,000
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	602,000
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