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Summary of Significant Accounting Policies (Details) - USD ($)	3 Months Ended		12 Months Ended
	Apr. 30, 2020	Apr. 30, 2019	Jan. 31, 2020
Summary of Significant Accounting Policies (Details) [Line Items]
Income Taxes Paid	$ 300,000	$ 0
Proceeds from Income Tax Refunds	200,000	$ 0
Unrecognized Tax Benefits	7,353,000		$ 7,353,000
Income Tax Examination, Penalties and Interest Accrued	18,000		17,000
Inventory Write-down	9,100,000		$ 1,300,000
Provision for Income Taxes [Member]
Summary of Significant Accounting Policies (Details) [Line Items]
Unrecognized Tax Benefits	$ (7,300,000)
Cost of Sales [Member]
Summary of Significant Accounting Policies (Details) [Line Items]
Maximum Percentage of Equity Ownership Interest Which May be Considered for Equity Method of Accounting	20.00%
Building and Building Improvements [Member] | Minimum [Member]
Summary of Significant Accounting Policies (Details) [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	5
Building and Building Improvements [Member] | Maximum [Member]
Summary of Significant Accounting Policies (Details) [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	40 years
Fixtures And Equipment [Member] | Minimum [Member]
Summary of Significant Accounting Policies (Details) [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	2
Fixtures And Equipment [Member] | Maximum [Member]
Summary of Significant Accounting Policies (Details) [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	20 years

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Maximum percentage of equity ownership interest which may be considered for equity method of accounting.

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The amount of estimated penalties and interest accrued as of the balance sheet date arising from income tax examinations.

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income.

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Amount of loss from reductions in inventory due to subsequent measurement adjustments, including, but not limited to, physical deterioration, obsolescence, or changes in price levels.

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Amount of unrecognized tax benefits.

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