Income Taxes [Line Items]

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- Definition

Percentage of provision of interest expense in excess of adjusted taxable income.

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Percentage of provision of net operating losses to taxable income.

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Tax cuts and jobs act of 2017 change in tax rate deferred tax asset liability income tax expense benefit.

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Tax cuts and jobs act of 2017 incomplete accounting provisional untaxed foreign earnings.

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Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Income Taxes - Additional Information (Detail) - USD ($)		3 Months Ended
	Dec. 31, 2017	Jul. 28, 2018	Jul. 29, 2017
Income Taxes [Line Items]
Income (loss) before taxes		$ (19,453,000)	$ (17,252,000)
Income tax benefit		$ (2,415,000)	$ (6,474,000)
Effective income tax rate		12.40%	37.50%
Amount of unrecognized tax benefits reasonably possible		$ 1,162,000
Benefit on the remeasurement of deferred tax assets and liabilities		$ 27,128,000
Corporate tax rate	35.00%	21.00%
Untaxed foreign earnings		$ 0
Subject To Utilization Limitations
Income Taxes [Line Items]
Percentage of provision of interest expense in excess of adjusted taxable income		30.00%
Percentage of provision of net operating losses to taxable income		80.00%
ASU 2016-09
Income Taxes [Line Items]
Excess tax benefits on share based payments		$ 580,000	$ 566,000
ASU 2016-09 \| Retained Earnings
Income Taxes [Line Items]
Deferred tax assets, valuation allowance		$ 3,894,000