Derivatives and Financial Instruments Derivatives and Financial Instruments (Details) - USD ($) number in Thousands, $ in Thousands	3 Months Ended		6 Months Ended		9 Months Ended
	Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2019	Apr. 30, 2018	Jul. 31, 2018	Oct. 31, 2018	Feb. 28, 2018	Mar. 01, 2016	Sep. 01, 2015	Feb. 24, 2014
Derivative [Line Items]
Derivatives, Interest Rate Swap, Maturity					5 years
Interest expense	$ 3,848	$ 2,645	$ 7,203	$ 4,985
Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Notional Amount, Second Amount Per Base									$ 25,000
Derivative, Notional Amount, Final Amount Per Base								$ 25,000
Other Liabilities [Member] | Cash Flow Hedging [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative Liability	(465)		(465)			$ 135
Euro Member Countries, Euro | Cross Currency Interest Rate Contract [Member]
Derivative [Line Items]
Derivative, Notional Amount							$ 53,000
London Interbank Offered Rate (LIBOR) [Member] | Cross Currency Interest Rate Contract [Member]
Derivative [Line Items]
Derivative, Notional Amount							$ 64,930
Interest Expense [Member]
Derivative [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	(247)	$ 21	(615)	$ 301
Lender Group Two [Member] | Revolving Credit Facility [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Notional Amount										$ 75,000
Derivative, Fixed Interest Rate										0.00%
Derivative, Notional Amount, Amount Per Base										$ 25,000
Fair Value, Measurements, Recurring [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative Liability	(465)		(465)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Cross Currency Interest Rate Contract [Member]
Derivative [Line Items]
Derivative, Fair Value, Net	0		0			$ 4,432
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative Liability	$ (465)		$ (465)