Pension Plan (Details 2) (USD $) In Thousands, unless otherwise specified	Feb. 28, 2013	Feb. 29, 2012	Feb. 28, 2011
Plan's fair value hierarchy for assets measured at fair value
Fair Value Measurements	$ 44,974	$ 42,002	$ 41,590
Level 1 [Member]
Plan's fair value hierarchy for assets measured at fair value
Fair Value Measurements	27,559	25,623
Level 2 [Member]
Plan's fair value hierarchy for assets measured at fair value
Fair Value Measurements	17,415	16,379
Level 3 [Member]
Plan's fair value hierarchy for assets measured at fair value
Fair Value Measurements
Cash and Cash Equivalents [Member]
Plan's fair value hierarchy for assets measured at fair value
Fair Value Measurements	3,605	3,746
Cash and Cash Equivalents [Member] | Level 1 [Member]
Plan's fair value hierarchy for assets measured at fair value
Fair Value Measurements	3,605	3,746
Cash and Cash Equivalents [Member] | Level 3 [Member]
Plan's fair value hierarchy for assets measured at fair value
Fair Value Measurements
Government bonds [Member]
Plan's fair value hierarchy for assets measured at fair value
Fair Value Measurements	9,972	9,938
Government bonds [Member] | Level 2 [Member]
Plan's fair value hierarchy for assets measured at fair value
Fair Value Measurements	9,972	9,938
Government bonds [Member] | Level 3 [Member]
Plan's fair value hierarchy for assets measured at fair value
Fair Value Measurements
Corporate bonds [Member]
Plan's fair value hierarchy for assets measured at fair value
Fair Value Measurements	7,443	6,441
Corporate bonds [Member] | Level 2 [Member]
Plan's fair value hierarchy for assets measured at fair value
Fair Value Measurements	7,443	6,441
Corporate bonds [Member] | Level 3 [Member]
Plan's fair value hierarchy for assets measured at fair value
Fair Value Measurements
Domestic equities [Member]
Plan's fair value hierarchy for assets measured at fair value
Fair Value Measurements	20,771	19,107
Domestic equities [Member] | Level 1 [Member]
Plan's fair value hierarchy for assets measured at fair value
Fair Value Measurements	20,771	19,107
Domestic equities [Member] | Level 3 [Member]
Plan's fair value hierarchy for assets measured at fair value
Fair Value Measurements
Foreign equities [Member]
Plan's fair value hierarchy for assets measured at fair value
Fair Value Measurements	3,183	2,770
Foreign equities [Member] | Level 1 [Member]
Plan's fair value hierarchy for assets measured at fair value
Fair Value Measurements	3,183	2,770
Foreign equities [Member] | Level 3 [Member]
Plan's fair value hierarchy for assets measured at fair value
Fair Value Measurements