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Reclassifications (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jul. 31, 2013	Apr. 30, 2013	Jul. 31, 2012	Apr. 30, 2012	Jul. 31, 2013	Jul. 31, 2012
Reclassifications [Line Items]
General and administration	$ 17,198	$ 16,337	$ 18,629	$ 16,108	$ 33,535	$ 34,737
Special charges	3,859	4,023	2,743	1,688	7,882	4,431
Scenario, Previously Reported
Reclassifications [Line Items]
General and administration		18,277	19,865	16,649		36,514
Special charges		$ 2,083	$ 1,507	$ 1,147		$ 2,654

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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