Balance Sheet Account Details - Narrative - Redeemable Noncontrolling Interests (Details) - Helix Holdings I, LLC [Member] - VIE, Primary beneficiary [Member]	Jan. 03, 2016	Jul. 31, 2015
Redeemable Noncontrolling Interest [Line Items]
Noncontrolling shareholders percentage	50.00%
Parent ownership percentage	50.00%	50.00%

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.

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