Revenue and Contract Receivables, net, Summary of Contract Receivables, net (Details) - USD ($) $ in Thousands	6 Months Ended
Jan. 28, 2017	Oct. 29, 2016	Jul. 31, 2016	Jan. 30, 2016	Oct. 31, 2015	Jul. 31, 2015
Revenue and Contract Receivables, net [Abstract]
Billed Contracts Receivable	$ 17,174		$ 20,415
Unbilled Contracts Receivable	16,228		20,696
Contracts Receivable, Gross	33,402		41,111
Allowance for doubtful accounts and contract adjustments	(2,047)	$ (6,882)	(6,792)	$ (6,982)	$ (6,782)	$ (6,817)
Total Contract receivables, net	31,355		34,319
Contractual retainage balance included under billed contract receivable	$ 1,000		$ 900
Management anticipation for receivables collection	1 year

Management anticipation for collection of unbilled receivables.

No definition available.

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- Definition

For unclassified balance sheet, amounts due from customers or clients for goods or services that have been delivered or sold in the normal course of business.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 210
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-Paragraph 1
-Subparagraph (SX 210.7-03(5))
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- Definition

For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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- Definition

Amounts due for billed services rendered or to be rendered, actions taken or to be taken, or a promise to refrain from taking certain actions in accordance with the terms of a legally binding agreement between the Company and, at a minimum, one other party. An example would be amounts billed to customers under contracts or programs but not paid as of the balance sheet date.

+ References

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- Definition

Amount billed to customers under long-term contracts or programs to be collected in the next fiscal year following the latest fiscal year. Excludes amounts due that have been withheld because of retainage provisions in a contract. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

No definition available.

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- Definition

Amount billed to customers under long-term contracts or programs that have been withheld because of retainage provisions in a contract.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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- References

No definition available.

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- Definition

Unbilled amounts due for services rendered or to be rendered, actions taken or to be taken, or a promise to refrain from taking certain actions in accordance with the terms of a legally binding agreement between the entity and, at a minimum, one other party. An example would be amounts associated with contracts or programs where the recognized revenue for performance thereunder exceeds the amounts billed under the terms thereof as of the date of the balance sheet.

+ References

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-Publisher FASB
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