Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands		12 Months Ended
		Jul. 31, 2015		Jul. 31, 2014		Jul. 31, 2013
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Tax at statutory rate		35.00%		35.00%		35.00%
Impairment charges (1)	[1]	55.80%		(40.30%)		(53.40%)
State income taxes, net of federal tax benefit (2)		1.60%	[2]	(1.10%)	[2]	(0.20%)
International rate differential		(2.20%)		(1.30%)		(4.60%)
Non-creditable withholding taxes		0.00%		0.00%		(1.50%)
Rate variances arising from foreign subsidiary distributions		(0.30%)		(7.50%)		(25.30%)
Adjustments to tax accruals and reserves (3)	[3]	17.80%		25.50%		1.00%
Research and development tax credits and section 199 manufacturer’s deduction		(3.90%)		3.60%		3.10%
Non-deductible divestiture fees and account write-offs		(4.80%)		(5.20%)		0.00%
Deferred tax and other adjustments		(21.10%)	[4]	0.70%	[4]	2.40%
Other, net		2.50%		(0.10%)		(1.00%)
Effective tax rate		80.40%		9.30%		(44.50%)
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Goodwill, Impairment Loss		$ 37,112		$ 100,412
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Impairment Losses, Amount		39,800		61,100		$ 168,900
Impairment charges		46,867		148,551		$ 204,448
Effective Income Tax Rate Reconciliation, Tax Credit, Amount				$ 3,100
Effective Income Tax Rate Reconciliation, Change in Uncertain Tax Postions, Amount		4,500
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount		1,000
Effective Income Tax Rate Reconciliation, Tax Credit, Foreign, Amount		$ 5,000

[1] (2)Includes a $3.1 million increase in valuation allowances against certain state tax credit carry-forwards during the year ended July 31, 2014.(3)Includes $4.5 million of current year uncertain tax positions and the reduction of uncertain tax positions resulting from the settlement of certain domestic and foreign income tax audits and lapses in statutes of limitations during the years ended July 31, 2015, 2014, and 2013.(4)Includes an additional $1.0 million of federal research and development credit carry-forwards due to re-enacted law and an additional $5.0 million foreign tax credit carryforward included on the fiscal 2014 U.S. tax return.

[2] (2)Includes a $3.1 million increase in valuation allowances against certain state tax credit carry-forwards during the year ended July 31, 2014.

[3] Includes $4.5 million of current year uncertain tax positions and the reduction of uncertain tax positions resulting from the settlement of certain domestic and foreign income tax audits and lapses in statutes of limitations during the years ended July 31, 2015, 2014, and 2013.

[4] Includes an additional $1.0 million of federal research and development credit carry-forwards due to re-enacted law and an additional $5.0 million foreign tax credit carryforward included on the fiscal 2014 U.S. tax return.