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Selected Quarterly Financial Information (Unaudited) Selected Quarterly Financial Information (Unaudited) (Tables)
 12 Months Ended
Apr. 28, 2018
Apr. 29, 2017
Quarterly Financial Information Disclosure [Abstract]    
Quarterly Financial Information [Table Text Block]
Fiscal 2018 Quarterly Period Ended
 
July 29,
2017
 
October 28, 2017 (a)
 
January 27, 2018 (b)
 
April 28, 2018 (b)
 
Fiscal Year
 2018
Sales
 
$
355,711

 
$
886,861

 
$
603,391

 
$
357,654

 
$
2,203,617

Gross profit
 
$
65,200

 
$
216,700

 
$
146,999

 
$
128,334

 
$
557,233

Net (loss) income
 
$
(34,783
)
 
$
48,395

 
$
(283,235
)
 
$
17,057

 
$
(252,566
)
Basic (loss) earnings per common share:
 
 
 
 
 
 
 
 
 
 
Net (loss) income
 
$
(0.75
)
 
$
1.04

 
$
(6.04
)
 
$
0.36

 
$
(5.40
)
Diluted (loss) earnings per common share:
 
 
 
 
 
 
 
 
 
 
Net (loss) income
 
$
(0.75
)
 
$
1.03

 
$
(6.04
)
 
$
0.36

 
$
(5.40
)
Fiscal 2017 Quarterly Period Ended
 
July 30,
2016
 
October 29, 2016
 
January 28, 2017
 
April 29, 2017 (c)
 
Fiscal Year
2017
Sales
 
$
239,237

 
$
770,671

 
$
521,624

 
$
342,830

 
$
1,874,362

Gross profit
 
$
47,833

 
$
171,954

 
$
116,249

 
$
123,025

 
$
459,061

Net (loss) income
 
$
(27,916
)
 
$
29,289

 
$
3,761

 
$
227

 
$
5,361

Basic (loss) earnings per common share:
 
 
 
 
 
 
 
 
 
 
Net (loss) income
 
$
(0.60
)
 
$
0.63

 
$
0.08

 
$
—

 
$
0.12

Diluted (loss) earnings per common share:
 
 
 
 
 
 
 
 
 
 
Net (loss) income
 
$
(0.60
)
 
$
0.63

 
$
0.08

 
$
—

 
$
0.11