Financing Arrangements - Schedule of long-term debt (Details) - USD ($)	Jul. 31, 2019	Jul. 31, 2018	Jun. 28, 2018
Debt Instrument [Line Items]
Total long-term debt, net of unamortized debt issuance costs	$ 230,851,000	$ 197,302,000
Current portion of long-term debt	(10,000,000)	(10,000,000)
Long-term debt, net of unamortized debt issuance costs and excluding current portion	220,851,000	187,302,000
Line of Credit
Debt Instrument [Line Items]
Unamortized debt issuance costs	(2,149,000)	(2,698,000)
Revolving credit loan | Line of Credit
Debt Instrument [Line Items]
Loans outstanding	43,000,000	0	$ 400,000,000
Tranche A term loan | Line of Credit
Debt Instrument [Line Items]
Loans outstanding	$ 190,000,000	$ 200,000,000	$ 200,000,000