Leases and Commitments Leases and Commitments (ASC 842 Quantitative Information) (Details)	12 Months Ended
	Jan. 31, 2020 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Operating lease cost	$ 5,435,000
Short-term lease cost	149,000
Short-term sublease income	(40,000)
Variable lease cost	892,000
Total lease cost	6,436,000
Cash paid for amounts included in the measurement of lease liabilities	5,435,000
Right-of-use assets obtained in exchange for new lease liabilities	$ 1,613,000
Weighted-average remaining lease term (years)	4 years 11 months 12 days
Weighted-average discount rate	6.38%