Financing Arrangements Future minimum lease payments under non-cancelable operating leases (Details) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2012
Financing Arrangements [Abstract]
Minimum Lease Payments, 2013	$ 1,467
Minimum Lease Payments, 2014	1,305
Minimum Lease Payments, 2015	1,141
Minimum Lease Payments, 2016	990
Minimum Lease Payments, 2017	201
Minimum Lease Payments, Thereafter	$ 224

For leases having an initial or remaining non-cancelable letter-terms in excess of one year, required rental payments due within one year of the balance sheet date relating to leases defined as operating.

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For leases having an initial or remaining non-cancelable letter-terms in excess of one year, required rental payments due within the fifth year of the balance sheet date relating to leases defined as operating.

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- Definition

For leases having an initial or remaining non-cancelable letter-terms in excess of one year, required rental payments due within the fourth year of the balance sheet date relating to leases defined as operating.

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- Definition

For leases having an initial or remaining non-cancelable letter-terms in excess of one year, required rental payments due within the third year of the balance sheet date relating to leases defined as operating.

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- Definition

For leases having an initial or remaining non-cancelable letter-terms in excess of one year, required rental payments due within the second year of the balance sheet date relating to leases defined as operating.

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- Definition

For leases having an initial or remaining non-cancelable letter-terms in excess of one year, required rental payments due after the fifth year from the balance sheet date on leases defined as operating.

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