Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Fixed interest rate related to the interest rate derivative.

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Amount after tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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Financing Arrangements (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		9 Months Ended
Financing Arrangements (Details) - USD ($) $ in Thousands	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2017	Apr. 30, 2016	Jul. 31, 2016	Oct. 31, 2016	Oct. 30, 2015	Apr. 29, 2015	Feb. 24, 2014
Debt Instrument [Line Items]
Debt Instrument, Interest Rate During Period			4.77%	4.79%
Letters of Credit Outstanding, Amount	$ 6,054		$ 6,054
Collateral Agreement	65.00%		65.00%
Long-term Debt	$ 240,236		$ 240,236
Long-term Debt, Excluding Current Maturities	242,808		$ 242,808			$ 256,922
Derivatives, Interest Rate Swap, Maturity			5 years
Other Comprehensive Loss, Unrealized Loss on Derivatives Arising During Period, Net of Tax	225	$ 10	$ 1,344	$ (470)
Interest Expense	4,200	4,520	9,012	8,872
Lender Group Two [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Increase Minimum								$ 25,000
Line of Credit Increase Maximum								100,000
Line of Credit Facility, Maximum Borrowing Capacity								360,000
Line of Credit, Committed Reductions								$ 30,000
Line of Credit Facility, Increase (Decrease) for Period, Description	7,500	5,000
Line of Credit Facility, Current Borrowing Capacity	347,500	355,000	347,500	355,000
Line of Credit Facility, Remaining Borrowing Capacity	$ 102,046		$ 102,046
Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.05%		3.05%
Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.77%		3.77%
Maximum [Member] \| Lender Group Two [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Capacity Available for Debt Issuance							$ 40,000
Line of Credit Facility, Capacity Available for Specific Purpose Other than for Trade Purchases							$ 50,000
Insurance Financing Agreement [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	1.96%		1.96%
Debt Instrument, Periodic Payment			$ 95
Short-term Debt	$ 95		95			661
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	95		95
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Long-term Debt	239,400		239,400			252,900
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	$ 0		$ 0
Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.47%		2.47%
Debt Instrument, Periodic Payment			$ 44
Long-term Debt	$ 741		741			996
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	520		520
Long-term Debt, Excluding Current Maturities	221		221
Capital Lease Obligations [Member]
Debt Instrument [Line Items]
Long-term Debt	4,051		4,051			$ 4,388
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	864		864
Interest Rate Swap [Member] \| Lender Group Two [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Derivative, Notional Amount									$ 75,000
Derivative, Fixed Interest Rate									2.74%
Derivative, Notional Amount, Amount Per Base									$ 25,000
Derivative, Incremental Amounts									$ 25,000
London Interbank Offered Rate (LIBOR) [Member] \| Minimum [Member] \| Lender Group Two [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate					1.50%
London Interbank Offered Rate (LIBOR) [Member] \| Maximum [Member] \| Lender Group Two [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate					4.00%
Base Rate [Member] \| Minimum [Member] \| Lender Group Two [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate					0.50%
Base Rate [Member] \| Maximum [Member] \| Lender Group Two [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate					3.00%
Fixed Rate Debt [Member]
Debt Instrument [Line Items]
Long-term Debt	836		836
Cash Flow Hedging [Member] \| Interest Rate Swap [Member] \| Lender Group Two [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Interest Expense	$ 368	$ 332	$ 786	$ 666