Income Taxes - Additional Information (Detail)	3 Months Ended	12 Months Ended
Oct. 31, 2018 USD ($) d	Jul. 31, 2018 USD ($)
Income Taxes [Line Items]
Unrecognized tax benefits related to federal, state and foreign taxes	$ 1,800,000	$ 1,600,000
Expected any unrecognized tax benefits to reverse in the next twelve months	0
Interest expense related to uncertain tax positions	$ 100,000	$ 200,000
Stockholder owning ownership on corporation's securities percentage	5.00%
Stockholder owning ownership on corporation's securities rolling period	3 years
Net operating loss carryforwards for federal tax	$ 2,100,000,000
Net operating loss carryforwards for state tax	$ 150,600,000
Business days \| d	10
Statutory federal income tax rate	21.00%	35.00%
Provision for income tax expense (benefit)		$ 280,400,000
Accumulated foreign earnings provisional income tax expense		0
Reduction in the valuation allowance		280,400,000
Deferred tax liability for earnings oversees	$ 0
Minimum
Income Taxes [Line Items]
Percentage of ownership require to obtain approval from board of directors to acquiring shares of the company's securities	4.99%
Parent Company
Income Taxes [Line Items]
Provision for income tax expense (benefit)		305,900,000
IWCO
Income Taxes [Line Items]
Provision for income tax expense (benefit)		$ (25,500,000)
Federal \| Internal Revenue Service (IRS) \| Earliest Tax Year
Income Taxes [Line Items]
Tax examinations tax period	2013
Federal \| Internal Revenue Service (IRS) \| Latest Tax Year
Income Taxes [Line Items]
Tax examinations tax period	2018
State \| Earliest Tax Year
Income Taxes [Line Items]
Tax examinations tax period	2013
State \| Latest Tax Year
Income Taxes [Line Items]
Tax examinations tax period	2018
Foreign \| Europe Income Tax Authority \| Earliest Tax Year
Income Taxes [Line Items]
Tax examinations tax period	2009
Foreign \| Europe Income Tax Authority \| Latest Tax Year
Income Taxes [Line Items]
Tax examinations tax period	2017
Foreign \| Asia Income Tax Authority \| Earliest Tax Year
Income Taxes [Line Items]
Tax examinations tax period	2005
Foreign \| Asia Income Tax Authority \| Latest Tax Year
Income Taxes [Line Items]
Tax examinations tax period	2017

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