Fair Value Measurement - Additional Information (Detail) - USD ($) $ in Thousands	Jul. 31, 2015	Jan. 31, 2015
Fair Value Disclosures [Abstract]
Business Combination, Contingent Consideration, Liability, Current	$ 1,582	$ 1,515
Business Combination, Contingent Consideration, Liability, Noncurrent	1,426	3,048
Fair value of notes payable	340,336	310,173
Notes Payable	236,825	230,400
Current portion of notes payable	233,637	0
Notes and Loans, Noncurrent	$ 3,188	$ 230,400

Amount of liability recognized arising from contingent consideration in a business combination, expected to be settled within one year or the normal operating cycle, if longer.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 35

-Paragraph 1

-Subparagraph b

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- Definition

Amount of liability recognized arising from contingent consideration in a business combination, expected to be settled beyond one year or the normal operating cycle, if longer.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

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-URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476

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- References

No definition available.

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Carrying value as of the balance sheet date of all notes and loans payable (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion.

+ References

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

-Publisher FASB

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Sum of the carrying values as of the balance sheet date of the portions of all long-term notes and loans payable due within one year or the operating cycle if longer.

+ References

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-Publisher FASB

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Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer.

+ References

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-Topic 944

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Fair value portion of notes payable.

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