Property, Plant and Equipment Future Minimum Lease Payments (Details) - Jan. 31, 2015 - USD ($) $ in Thousands	Total
Future Capital Lease Payments [Line Items]
Capital Leases, Future Minimum Payments Due, Next Twelve Months	$ 1,034
Capital Leases, Future Minimum Payments Due in Two Years	1,034
Capital Leases, Future Minimum Payments Due in Three Years	1,034
Capital Leases, Future Minimum Payments Due in Four Years	1,017
Capital Leases, Future Minimum Payments Due in Five Years	641
Capital Leases, Future Minimum Payments Due Thereafter	2,241
Capital Leases, Future Minimum Payments Due	7,001
Capital Leases, Future Minimum Payments, Interest Included in Payments	754
Capital Leases, Future Minimum Payments, Present Value of Net Minimum Payments	$ 6,247
Minimum [Member]
Future Capital Lease Payments [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.05%
Maximum [Member]
Future Capital Lease Payments [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.77%

Amount of minimum lease payments for capital leases.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737

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Amount of minimum lease payments for capital leases due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of minimum lease payments for capital leases due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of minimum lease payments for capital leases due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of minimum lease payments for capital leases due in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of minimum lease payments for capital leases due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of minimum lease payments for capital leases due after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount necessary to reduce net minimum lease payments to present value for capital leases.

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Present value of minimum lease payments for capital leases net of executory costs, including amounts paid by the lessee to the lessor for insurance, maintenance and taxes.

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

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