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The Tax Cuts and Jobs Act (Details) - USD ($) $ in Millions	1 Months Ended	9 Months Ended
	Dec. 22, 2017	Apr. 30, 2019	Apr. 30, 2018
The Tax Cuts and Jobs Act (Textual)
U.S. federal statutory corporate tax rate		26.90%
U.S. federal statutory tax rate, thereafter		21.00%
Federal net operating loss carryforwards		$ 11	$ 12
Minimum [Member]
The Tax Cuts and Jobs Act (Textual)
U.S. federal statutory corporate tax rate	21.00%
Maximum [Member]
The Tax Cuts and Jobs Act (Textual)
U.S. federal statutory corporate tax rate	35.00%

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- Definition

It represents about effective income tax rate reconciliation at federal statutory income tax rate phase in rate.

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Amount of federal net operating loss carryforwards used to offset transition tax.

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- Definition

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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