Dividends and Treasury Stock (Details)	3 Months Ended	6 Months Ended
Jul. 31, 2021 USD ($) shares	Jul. 31, 2021 USD ($) shares
Stockholders' Equity Note [Abstract]
Stock Repurchase Program, Authorized Amount	$ 75,000,000	$ 75,000,000
Shares repurchased, Treasury Stock \| shares	0	0
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 17,179,000	$ 17,179,000

Number of shares that have been repurchased and retired during the period.

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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration