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Cash dividend and declared dividends - Additional Information (Detail) (USD $)	0 Months Ended	3 Months Ended
	Apr. 15, 2015	Jan. 31, 2015	Jan. 31, 2014
Dividends Payable [Line Items]
Dividends paid, per share	$ 0.07us-gaap_CommonStockDividendsPerShareCashPaid
Dividends paid		$ 578,000us-gaap_PaymentsOfDividendsCommonStock	$ 570,000us-gaap_PaymentsOfDividendsCommonStock
Dividends Paid
Dividends Payable [Line Items]
Dividends paid, per share		$ 0.07us-gaap_CommonStockDividendsPerShareCashPaid / us-gaap_DividendsAxis = us-gaap_DividendPaidMember	$ 0.07us-gaap_CommonStockDividendsPerShareCashPaid / us-gaap_DividendsAxis = us-gaap_DividendPaidMember
Dividends paid		$ 578,000us-gaap_PaymentsOfDividendsCommonStock / us-gaap_DividendsAxis = us-gaap_DividendPaidMember	$ 570,000us-gaap_PaymentsOfDividendsCommonStock / us-gaap_DividendsAxis = us-gaap_DividendPaidMember

X

- Definition

Aggregate dividends paid during the period for each share of common stock outstanding.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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X

- Definition

Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

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