Discontinued Operations - Summary Information Regarding the Shred-it Partnership's Financial Position (Details) $ in Thousands	12 Months Ended
Apr. 30, 2015 USD ($)
Summary Income Statement Information
Net sales	$ 695,628
Gross profit	432,532
Net income	$ 10,385

The amount of net income (loss) reported by an equity method investment of the entity.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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