PENSION PLANS - Fair Value of Pension Assets (Details) - USD ($) $ in Thousands	Jul. 29, 2017	Jul. 30, 2016
Defined Benefit Plan Disclosure [Line Items]
Cash	$ 776	$ 1,173
Equity Securities [Abstract]
Company stock	636	770
U.S large cap	20,893	18,416
U.S. small/mid cap	6,823	6,591
International	7,608	6,752
Emerging markets	1,277	1,219
Fixed Income Securities [Abstract]
U.S treasuries	9,876	10,560
Mortgage-backed	1,889	1,918
Corporate bonds	6,110	5,194
International	619	688
Total	56,507	53,281
Level 1
Defined Benefit Plan Disclosure [Line Items]
Cash	166	1,173
Equity Securities [Abstract]
Company stock	636	770
U.S large cap	19,696	18,416
U.S. small/mid cap	6,644	6,591
International	7,187	6,752
Emerging markets	1,277	1,219
Fixed Income Securities [Abstract]
U.S treasuries	9,520	10,560
Mortgage-backed	1,783	0
Corporate bonds	2,931	3,054
International	619	688
Total	50,459	49,223
Level 2
Defined Benefit Plan Disclosure [Line Items]
Cash	610	0
Equity Securities [Abstract]
Company stock	0	0
U.S large cap	1,197	0
U.S. small/mid cap	179	0
International	421	0
Emerging markets	0	0
Fixed Income Securities [Abstract]
U.S treasuries	356	0
Mortgage-backed	106	1,918
Corporate bonds	3,179	2,140
International	0	0
Total	$ 6,048	$ 4,058