Income Taxes (Details) - USD ($) $ in Millions	5 Months Ended	7 Months Ended	9 Months Ended		12 Months Ended
	Dec. 31, 2017	Jul. 31, 2018	Apr. 28, 2018	Apr. 29, 2017	Jul. 31, 2018
Income Tax Disclosure [Line Items]
Estimated effective tax rate			63.50%	63.00%
Statutory federal tax rate	34.00%
Estimated net deferred tax expense			$ 0.3
Estimated federal tax expense			0.1
One-time transition tax			0.3
Benefit from outstanding unpaid dividends from a foreign subsidiary			0.2
Transition tax as a non-current income tax liability			$ 0.3
Transition tax non-current income tax liability expected pay period			8 years
Plan [Member]
Income Tax Disclosure [Line Items]
Statutory federal tax rate		21.00%			26.00%