PENSION PLANS - Fair Value of Pension Assets (Details) - USD ($) $ in Thousands	Jul. 30, 2016	Jul. 25, 2015
Defined Benefit Plan Disclosure [Line Items]
Cash	$ 1,173	$ 718
Equity Securities [Abstract]
Company stock	770	651
U.S large cap	18,416	18,368
U.S. small/mid cap	6,591	6,602
International	6,752	6,431
Emerging markets	1,219	1,193
Fixed Income Securities [Abstract]
U.S treasuries	10,560	9,911
Mortgage-backed	1,918	2,014
Corporate bonds	5,194	5,180
International	688	661
Total	53,281	51,729
Level 1
Defined Benefit Plan Disclosure [Line Items]
Cash	1,173	718
Equity Securities [Abstract]
Company stock	770	651
U.S large cap	18,416	18,368
U.S. small/mid cap	6,591	6,602
International	6,752	6,431
Emerging markets	1,219	1,193
Fixed Income Securities [Abstract]
U.S treasuries	10,560	9,911
Mortgage-backed	0	0
Corporate bonds	3,054	2,810
International	688	661
Total	49,223	47,345
Level 2
Defined Benefit Plan Disclosure [Line Items]
Cash	0	0
Equity Securities [Abstract]
Company stock	0	0
U.S large cap	0	0
U.S. small/mid cap	0	0
International	0	0
Emerging markets	0	0
Fixed Income Securities [Abstract]
U.S treasuries	0	0
Mortgage-backed	1,918	2,014
Corporate bonds	2,140	2,370
International	0	0
Total	$ 4,058	$ 4,384