The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

+ References+ Details

Loss recognized during the period that results from the write-down of goodwill after comparing the implied fair value of reporting unit goodwill with the carrying amount of that goodwill. Goodwill is assessed at least annually for impairment.

+ References

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+ Details

Goodwill And Intangible Assets (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Apr. 30, 2012	Apr. 30, 2011	Apr. 30, 2013	Apr. 30, 2012	Apr. 30, 2011
Intangible assets amortization expense			$ 1,538	$ 2,115	$ 3,589
Good will impairment charges				13,455
Goodwill impairment, percentage of carrying value.				69.00%
Impairments of goodwill and intangible assets	15,000	16,000		15,047	15,964
Ediscovery [Member]
Good will impairment charges				13,455
Impairments of goodwill and intangible assets				1,500
Technology-Based [Member] \| Ediscovery [Member]
Good will impairment charges				1,200
Trademarks [Member] \| Ediscovery [Member]
Good will impairment charges				200
Noncompete Agreements [Member] \| Ediscovery [Member]
Good will impairment charges				100
AXS-One [Member]
Good will impairment charges					3,300
AXS-One [Member] \| Goodwill [Member]
Good will impairment charges					11,200
Goodwill impairment, percentage of carrying value.					100.00%
AXS-One [Member] \| Technology-Based [Member]
Good will impairment charges					2,600
AXS-One [Member] \| Trademarks [Member]
Good will impairment charges					700
CipherSoft [Member]
Good will impairment charges					400
CipherSoft [Member] \| Goodwill [Member]
Good will impairment charges					1,100
Goodwill impairment, percentage of carrying value.					100.00%
CipherSoft [Member] \| Technology-Based [Member]
Good will impairment charges					300
CipherSoft [Member] \| Trade Names [Member]
Good will impairment charges					$ 100