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

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Financing Arrangements (Details) - USD ($) $ in Thousands	3 Months Ended
Financing Arrangements (Details) - USD ($) $ in Thousands	Apr. 30, 2015	Jan. 31, 2015	Jan. 31, 2014	Oct. 31, 2014	Sep. 29, 2014	Feb. 24, 2014
Debt Instrument [Line Items]
Debt Instrument, Interest Rate During Period		2.23%	2.08%
Line of Credit Facility, Covenant, Leverage Ratio, Minimum		3.25
Line of Credit Facility, Covenant, Leverage Ratio, Maximum		3.50
Letters of Credit Outstanding, Amount		$ 2,980
Collateral Agreement		65.00%
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months		$ 1,601
Long-term Debt, Excluding Current Maturities		$ 271,594		$ 268,102
Derivatives, Interest Rate Swap, Maturity		5 years
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax		$ (1,504)	$ 0
Lender Group Two [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity					$ 360,000
Line of Credit Increase Maximum					100,000
Line of Credit Facility, Remaining Borrowing Capacity		$ 92,220
Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		3.05%
Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		3.77%
Insurance Financing Agreement [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		1.87%
Debt Instrument, Periodic Payment		$ 95
Short-term Debt		285		568
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months		$ 285
Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		2.47%
Debt Instrument, Periodic Payment		$ 44
Long-term Debt		1,863		1,985
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months		492
Long-term Debt, Excluding Current Maturities		1,371
Capital Lease Obligations [Member]
Debt Instrument [Line Items]
Long-term Debt		6,247		$ 6,967
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months		$ 824
Aggregate Revolving A [Member] \| Lender Group Two [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity					235,000
Aggregate Revolving B [Member] \| Lender Group Two [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity					$ 125,000
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, Incremental Amounts						$ 25,000
London Interbank Offered Rate (LIBOR) [Member] \| Lender Group Two [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		2.00%
Base Rate [Member] \| Lender Group Two [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		1.00%
Scenario, Forecast [Member] \| 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%
Scenario, Forecast [Member] \| 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	2.50%
Scenario, Forecast [Member] \| Base Rate [Member] \| Minimum [Member] \| Lender Group Two [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.25%
Scenario, Forecast [Member] \| Base Rate [Member] \| Maximum [Member] \| Lender Group Two [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.50%