Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands		12 Months Ended
		Jul. 31, 2017		Jul. 31, 2016		Jul. 31, 2015
Income Tax Disclosure [Abstract]
Unrecognized Tax Benefits, Income Tax Penalties Expense		$ 0				$ 66
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Tax at statutory rate		35.00%		35.00%		35.00%
Impairment charges (1)	[1]	0.00%		0.00%		55.80%
State income taxes, net of federal tax benefit		1.00%	[2]	0.80%	[2]	1.60%
International rate differential		(6.30%)		0.40%		(2.20%)
Rate variances arising from foreign subsidiary distributions (2)		(5.90%)		0.50%		(0.30%)
Adjustments to tax accruals and reserves (3)	[3]	3.60%		(3.70%)		17.80%
Research and development tax credits and section 199 manufacturer’s deduction		(1.80%)		(3.60%)		(3.90%)
Non-deductible divestiture fees and account write-offs		(0.60%)		(0.40%)		(4.80%)
Deferred tax and other adjustments (4)		(0.60%)	[4]	(1.40%)	[4]	(21.10%)
Other, net		0.10%		(0.90%)		2.50%
Effective tax rate		24.50%		26.70%		80.40%
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Impairment Losses, Amount				$ 39,800
Impairment charges		$ 0		$ 0		$ 46,867
Effective Income Tax Rate Reconciliation, Tax Credit, Foreign, Amount						$ 5,000

[1] The year ended July 31, 2017, includes the generation of foreign tax credit carry-forwards from cash repatriations that occurred during the fiscal year.(3)The years ended July 31, 2017 and 2015, include increases in current year uncertain tax positions, while the year ended July 31, 2016, includes reductions of uncertain tax positions resulting from the closure of audits and lapses in statutes of limitations. (4)The year ended July 31, 2015, includes the generation $5.0 million of foreign tax credit carry-forwards from the fiscal 2014 U.S. tax return.Uncert

[2] {F|ahBzfndlYmZpbGluZ3MtaHJkcmoLEgZYTUxEb2MiXlhCUkxEb2NHZW5JbmZvOmMwNDM5NzFjZjAzYzRjZTViNmIwM2I4MzM5ZWJjNWRifFRleHRTZWxlY3Rpb246RDM3N0Q4NTQzRDg5MjJCM0FGQUUzNjg0MTY1OUJDQTkM}

[3] n tax positions resulting from the closure of audits and lapses in statutes of limitations.

[4] r ended July 31, 2015, includes the generation $5.0 million of foreign tax credit carry-forwards from the fiscal 2014 U.S. tax return.Uncert