Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended	5 Months Ended	7 Months Ended	12 Months Ended
	Jul. 31, 2018	Dec. 31, 2017	Jul. 31, 2018	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2017
Income Tax [Line Items]
Corporate tax rate		35.00%	21.00%
Unrecognized tax benefits that, if recognized, would affect the company's income tax rate	$ 10,491		$ 10,491	$ 11,332	$ 10,491	$ 8,477
Accrued interest and penalties	1,290		$ 1,290	1,758	1,290
Total amount of interest and penalties expense (benefit) recognized				454	203	(218)
Expected decrease in unrecognized tax benefits due to resolution of uncertain tax positions				3,800
Expected decrease in interest due to resolution of uncertain tax positions				850
Income Tax Expense Benefit				61,289	$ 187,427	$ 221,311
Foreign Subsidaries [Member]
Income Tax [Line Items]
Deferred Tax Liabilities Unrecorded				0
GILTI [Member]
Income Tax [Line Items]
Income Tax Expense Benefit				0
State and Local Jurisdiction
Income Tax [Line Items]
Tax credit carry forward				3,162
Gross state tax Net Operating Loss carry forwards				4,811
Deferred tax asset, Net Operating Loss carry forwards				$ 299
State and Local Jurisdiction | Earliest Tax Year
Income Tax [Line Items]
Tax Credit Carry forward Expiration Year				2026
Gross state tax Net Operating Loss carry forwards, expiration year				2020
State and Local Jurisdiction | Latest Tax Year
Income Tax [Line Items]
Tax Credit Carry forward Expiration Year				2029
Gross state tax Net Operating Loss carry forwards, expiration year				2039
Foreign Tax Authority [Member]
Income Tax [Line Items]
Gross state tax Net Operating Loss carry forwards				$ 54,008
Foreign Tax Authority [Member] | Earliest Tax Year
Income Tax [Line Items]
Gross state tax Net Operating Loss carry forwards, expiration year				2023
Foreign Tax Authority [Member] | Latest Tax Year
Income Tax [Line Items]
Description Of Maximum Period For Which Operating Loss Can Be Carried Forward				indefinite carryforward
Blended Federal Tax [Member]
Income Tax [Line Items]
Corporate tax rate					26.90%
Staff Accounting Bulletin Number 118
Income Tax [Line Items]
Measurement period				1 year
Provisional tax amount of additional deferred income tax expense				$ 34,000
Provisional tax amount of additional income tax expense	$ 2,000