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Business Acquisitions - Schedule of Unaudited Proforma Combined Financial Information (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2014	Jan. 31, 2013
Business Combinations [Abstract]
Revenue	$ 118,210	$ 116,385	$ 382,786	$ 366,889
Operating (loss) income	(1,215)	584	18,671	12,227
Net loss attributable to common stockholders	$ (10,721)	$ (11,274)	$ (10,965)	$ (40,537)
Basic and diluted loss per common share attributable to common stockholders	$ (0.27)	$ (0.29)	$ (0.28)	$ (1.25)
Basic and diluted weighted average shares outstanding	39,882	39,230	39,789	32,365

X

- Definition

The pro forma basic and diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References

No definition available.

+ Details

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- Definition

The pro forma operating income for the period as if the business combination or combinations had been completed at the beginning of the period.

+ References

No definition available.

+ Details

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- Definition

The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(2)-(3)

-URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463

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- Definition

The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(2)-(3)

-URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463

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- Definition

Average number of shares or units issued and outstanding that are used in calculating basic and diluted earnings per share (EPS).

+ References

No definition available.

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