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Shareholders' Equity - Additional Information (Detail) (USD $)	0 Months Ended	12 Months Ended
	Dec. 05, 2014	Jan. 31, 2015	Jan. 31, 2014
Equity [Abstract]
Common stock repurchased, shares	500,000us-gaap_TreasuryStockSharesAcquired
Common stock shares repurchased, value	$ 6,250,000	$ 6,250,000
Company shares given to employees, shares		62,797	66,828
Company shares given to employees, value		$ 878,000	$ 797,000
Common stock shares additional authorized		390,000

Value of stock (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of stock value of such awards forfeited. Stock issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

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