Fair Value - Assets Measured at Fair Value on a Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified	Nov. 01, 2014	Jan. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money Market Funds (included in Cash and Cash Equivalents)	$ 5,954	$ 4,734
State and Municipal Obligations (included in Securities Available for Sale)	17,631	18,766
Total	23,585	23,500
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money Market Funds (included in Cash and Cash Equivalents)	5,954	4,734
State and Municipal Obligations (included in Securities Available for Sale)
Total	5,954	4,734
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money Market Funds (included in Cash and Cash Equivalents)
State and Municipal Obligations (included in Securities Available for Sale)	17,631	18,766
Total	17,631	18,766
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money Market Funds (included in Cash and Cash Equivalents)
State and Municipal Obligations (included in Securities Available for Sale)
Total