Derivatives and Financial Instruments Derivatives and Financial Instruments (Details) - USD ($) number in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
	Apr. 29, 2019	Jan. 31, 2020	Jan. 31, 2019	Jul. 31, 2018	Oct. 31, 2019	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		$ 4,356	$ 3,355
Cross Currency Interest Rate Contract [Member]
Derivative [Line Items]
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	$ 5,110
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					$ (621)	$ (814)
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		175	$ (368)
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		(621)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative Liability		$ (621)