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Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Parent	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income	Non-controlling Interest	Total
Balance at Apr. 30, 2019	$ 462,571	$ 2	$ 176,216	$ 286,351	$ 2	$ 4	$ 462,575
Balance (in shares) at Apr. 30, 2019		23,946,293
Increase (Decrease) in Stockholders' Equity
Net income (loss)	17,110			17,110		(11)	17,099
Net loss attributable to noncontrolling interest							11
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest							17,099
Foreign currency translation	169				169		169
Stock options exercised	93		93				93
Stock options exercised (in shares)		3,000
Restricted stock awards (in shares)		57,861
Restricted stock awards forfeited (in shares)		(4,720)
Tax withholding payment related to net share settlement of equity awards	(668)		(668)				(668)
Tax withholding payment related to net share settlement of equity awards (in shares)		(11,975)
Stock-based compensation	1,566		1,566				1,566
Balance at Jul. 27, 2019	481,506	$ 2	177,207	304,126	171	(7)
Balance (in shares) at Jul. 27, 2019		23,990,459
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance at Jul. 27, 2019							481,499
Increase (Decrease) in Stockholders' Equity
Adoption of ASU | ASU 2018-09	665			665			665
Balance at Apr. 30, 2020	509,901	$ 2	181,481	328,090	328		509,901
Balance (in shares) at Apr. 30, 2020		24,063,639
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Beginning Balance at Apr. 30, 2020							509,901
Increase (Decrease) in Stockholders' Equity
Net income (loss)	10,080			10,080		(37)	10,043
Net loss attributable to noncontrolling interest							37
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest							10,043
Unrealized loss on investments	(52)				(52)		(52)
Foreign currency translation	75				75		75
Stock options exercised	86		86				86
Stock options exercised (in shares)		3,500
Restricted stock awards (in shares)		60,592
Restricted stock awards forfeited (in shares)		(270)
Tax withholding payment related to net share settlement of equity awards	(1,756)		(1,756)				(1,756)
Tax withholding payment related to net share settlement of equity awards (in shares)		(22,897)
Stock-based compensation	1,595		1,595				1,595
Balance at Aug. 01, 2020	$ 519,929	$ 2	$ 181,406	$ 338,170	$ 351	$ (37)	519,929
Balance (in shares) at Aug. 01, 2020		24,104,564
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance at Aug. 01, 2020							$ 519,892

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