Consolidated Statement of Changes in Shareholders' Equity (Unaudited) - 9 months ended Jan. 27, 2018 - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Gains	Retained Earnings	Treasury Stock at Cost
Balance at Apr. 29, 2017	$ 574,311	$ 112	$ 1,741,380	$ 315	$ (46,425)	$ (1,121,071)
Adoption of ASU 2016-09(see Note 19)	2,347		1,310		1,037
Net loss	(104,408)				(104,408)
Stock-based compensation expense	4,788		4,788
Cash dividends declared	(32,719)				(32,719)
Accrued dividends for long-term incentive awards	(549)				(549)
Purchase of treasury stock related to stock-based compensation, 88 shares	(653)					(653)
Balance at Jan. 27, 2018	$ 443,117	$ 112	$ 1,747,478	$ 315	$ (183,064)	$ (1,121,724)