Subsequent Event (Details)			9 Months Ended
	May 15, 2020 USD ($) $ / shares	May 11, 2020 USD ($)	Apr. 30, 2020 USD ($)	May 12, 2020 USD ($)	Jul. 31, 2019 USD ($)
Interest rate swap | Designated as hedging instrument
Subsequent Event [Line Items]
Notional value			$ 500,000,000		$ 150,000,000
Line of Credit
Subsequent Event [Line Items]
Fees on unused portion of credit facilities (as a percent)			0.40%
Line of Credit | Minimum
Subsequent Event [Line Items]
Fees on unused portion of credit facilities (as a percent)			0.20%
Line of Credit | Maximum
Subsequent Event [Line Items]
Fees on unused portion of credit facilities (as a percent)			0.40%
Line of Credit | Lender's base rate | Minimum
Subsequent Event [Line Items]
Margin on reference rate (as a percent)			0.00%
Line of Credit | Lender's base rate | Maximum
Subsequent Event [Line Items]
Margin on reference rate (as a percent)			1.25%
Line of Credit | LIBOR
Subsequent Event [Line Items]
Margin on reference rate (as a percent)			2.25%
Line of Credit | LIBOR | Minimum
Subsequent Event [Line Items]
Margin on reference rate (as a percent)			1.00%
Line of Credit | LIBOR | Maximum
Subsequent Event [Line Items]
Margin on reference rate (as a percent)			2.25%
Second Amendment | Line of Credit
Subsequent Event [Line Items]
Maximum consolidated leverage ratio			4.25
Subsequent Event
Subsequent Event [Line Items]
Floor interest rate		1.00%
Subsequent Event | Interest rate swap | Designated as hedging instrument
Subsequent Event [Line Items]
Notional value				$ 500,000,000
Derivative, floor interest rate		0.00%		1.00%
Fair value derivative liability				$ 21,920,000
Subsequent Event | Second Amendment | Line of Credit
Subsequent Event [Line Items]
Maximum consolidated leverage ratio		5.25
Minimum liquidity during next fiscal quarter		$ 50,000,000
Minimum liquidity year one		$ 75,000,000
Floor interest rate		1.00%
Shares of foreign subsidiaries pledged as security (as a percent)		65.00%
Subsequent Event | Second Amendment | Line of Credit | Lender's base rate | Debt Instrument, Covenant, Period One
Subsequent Event [Line Items]
Margin on reference rate (as a percent)		2.00%
Subsequent Event | Second Amendment | Line of Credit | Lender's base rate | Minimum | Debt Instrument, Covenant, Period Two
Subsequent Event [Line Items]
Margin on reference rate (as a percent)		0.00%
Subsequent Event | Second Amendment | Line of Credit | Lender's base rate | Maximum | Debt Instrument, Covenant, Period Two
Subsequent Event [Line Items]
Margin on reference rate (as a percent)		1.75%
Subsequent Event | Second Amendment | Line of Credit | LIBOR | Debt Instrument, Covenant, Period One
Subsequent Event [Line Items]
Margin on reference rate (as a percent)		3.00%
Subsequent Event | Second Amendment | Line of Credit | LIBOR | Minimum | Debt Instrument, Covenant, Period Two
Subsequent Event [Line Items]
Margin on reference rate (as a percent)		1.00%
Subsequent Event | Second Amendment | Line of Credit | LIBOR | Maximum | Debt Instrument, Covenant, Period Two
Subsequent Event [Line Items]
Margin on reference rate (as a percent)		2.75%
Subsequent Event | Second Amendment | Revolving credit loan | Line of Credit
Subsequent Event [Line Items]
Maximum borrowing capacity		$ 300,000,000
Subsequent Event | Second Amendment | Revolving credit loan | Line of Credit | Debt Instrument, Covenant, Period One
Subsequent Event [Line Items]
Fees on unused portion of credit facilities (as a percent)		0.50%
Subsequent Event | Second Amendment | Revolving credit loan | Line of Credit | Minimum | Debt Instrument, Covenant, Period Two
Subsequent Event [Line Items]
Fees on unused portion of credit facilities (as a percent)		0.20%
Subsequent Event | Second Amendment | Revolving credit loan | Line of Credit | Maximum | Debt Instrument, Covenant, Period Two
Subsequent Event [Line Items]
Fees on unused portion of credit facilities (as a percent)		0.50%
Subsequent Event | 3.25% Convertible Senior Notes | Convertible notes
Subsequent Event [Line Items]
Aggregate principal	$ 168,000,000
Interest rate (as a percent)	3.25%
Proceeds from convertible debt	$ 162,977,000
Conversion price (in dollars per share) | $ / shares	$ 41.51
Percent of proceeds used to repay debt	50.00%
Net proceeds not used to repay debt	$ 100,000,000
Subsequent Event | Over Allotment Option | Convertible notes
Subsequent Event [Line Items]
Aggregate principal	28,000,000
Subsequent Event | Initial Purchase | Convertible notes
Subsequent Event [Line Items]
Aggregate principal	$ 140,000,000