Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 27, 2018	Jan. 28, 2017	Jan. 27, 2018	Jan. 28, 2017
Net income (loss)	$ (63,536)	$ 70,276	$ (104,408)	$ 35,451
Other comprehensive income, net of tax:
Decrease in postretirement plan liability (net of deferred tax expense of $0, $0, $0 and $30, respectively)				47
Total comprehensive income (loss)	$ (63,536)	$ 70,276	$ (104,408)	$ 35,498