Balance Sheet - Additional Information (Detail)	3 Months Ended	12 Months Ended
Apr. 30, 2017 USD ($) Customer	Jan. 31, 2017 USD ($) Customer
Balance Sheet [Line Items]
Contracts receivable	$ 6,265,000	$ 2,752,000
Number of customers due \| Customer	4	3
Contracts receivable, interest rate	2.90%	2.20%
Long-term contract receivable for sale of lease pool equipment	$ 3,800,000
Number of installments	24
Impairment charges related to long-lived assets		$ 0
Minimum [Member]
Balance Sheet [Line Items]
Contracts receivable repayment term	1 month
Maximum [Member]
Balance Sheet [Line Items]
Contracts receivable repayment term	40 months

Balance Sheet [Line Items]

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- Definition

Contract Receivable Gross

+ References

No definition available.

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- Definition

Contracts receivable repayment term.

+ References

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- Definition

Number of customers.

+ References

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- Definition

Number of installments.

+ References

No definition available.

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- Definition

The weighted average interest rate charged on contract receivables maturing after one year.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 910
-SubTopic 310
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=68065756&loc=d3e49354-109356

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- Definition

Amount billed to customers under long-term contracts or programs to be collected in the second fiscal year following the latest fiscal year. Excludes amounts due that have been withheld because of retainage provisions in a contract. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 910
-SubTopic 310
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=68065756&loc=d3e49354-109356

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- Definition

The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 958
-SubTopic 225
-Section 45
-Paragraph 11
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=84241808&loc=d3e92212-112881

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-Name Accounting Standards Codification
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