Additional income tax expense (benefit) from re-measurement of deferred tax assets and liabilities.

No definition available.

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Income Taxes [Line Items]

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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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No definition available.

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

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No definition available.

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- Definition

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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Income Taxes - Additional Information (Detail) - USD ($)		3 Months Ended		9 Months Ended
	Dec. 31, 2017	Jan. 26, 2019	Jan. 27, 2018	Jan. 26, 2019	Jan. 27, 2018
Income Taxes [Line Items]
Income (loss) before taxes		$ 75,855,000	$ (37,411,000)	$ 26,210,000	$ (109,573,000)
Income taxes provision (benefit)		$ 8,925,000	$ 26,125,000	$ 3,712,000	$ (5,165,000)
Effective income tax rate		11.80%	(69.80%)	14.20%	4.70%
Amount of unrecognized tax benefits reasonably possible		$ 477,000		$ 477,000
Benefit on the remeasurement of deferred tax assets and liabilities				$ 27,128,000
Corporate tax rate	35.00%			21.00%
Untaxed foreign earnings		0		$ 0
Additional income tax expense (benefit) from re-measurement of deferred tax assets and liabilities.				170,000
ASU 2016-09
Income Taxes [Line Items]
Excess tax benefits on share based payments		8,000	$ 11,000	722,000	$ 915,000
ASU 2016-09 \| Retained Earnings
Income Taxes [Line Items]
Deferred tax assets, valuation allowance		$ 3,894,000		$ 3,894,000