Derivative Financial (Derivative Financial Instruments Designated as Cash Flow Hedges (Details) - USD ($)	3 Months Ended		12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Oct. 31, 2017
Derivative Cash Flow Hedge [Line Items]
Loss on hedge from treasury lock entered into in conjunction with the issuance of the Senior Notes			$ 400,000
Senior Notes 2027 [Member]
Derivative Cash Flow Hedge [Line Items]
Gain (loss) expected to be reclassified as interest expense on derivative financial instruments designated as cash flow hedges, over the next twelve months	$ 68,000
Total unamortized loss balance on interest rate lock expected to be reclassified to earnings	500,000
Loss reclassified to interest expense on derivative financial instruments designated as cash flow hedges	17,000	$ 17,000
Senior Notes 2023 [Member]
Derivative Cash Flow Hedge [Line Items]
Gain reclassified to interest expense on derivative financial instruments designated as cash flow hedges	50,000	$ 50,000
Gain (loss) expected to be reclassified as interest expense on derivative financial instruments designated as cash flow hedges, over the next twelve months	200,000
Total unamortized loss balance on interest rate lock expected to be reclassified to earnings	$ 700,000