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COMMITMENTS AND CONTINGENCIES (Details 2) $ in Millions	12 Months Ended
	Jul. 28, 2018 USD ($)
Inventories
Purchase commitment
Outstanding purchase commitments	$ 15.9
Diesel fuel
Purchase commitment
Outstanding purchase commitments	$ 0.0

X

- Definition

The minimum amount the entity agreed to spend under the long-term purchase commitment.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis=us-gaap_FuelMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: