Summary of Significant Accounting and Reporting Policies (Adoption of New Accounting Pronouncements) (Details) - USD ($)	Jul. 31, 2019	Aug. 01, 2018	Jul. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accrued expenses and other current liabilities	$ 78,584,000	$ 62,955,000	$ 65,034,000
Contract liabilities, current and non-current		44,220,000
Calculated under Revenue Guidance in Effect before Topic 606
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accrued expenses and other current liabilities			65,034,000
Contract liabilities, current and non-current			$ 42,141,000
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accrued expenses and other current liabilities		(2,079,000)
Contract liabilities, current and non-current		$ 2,079,000