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Stock Repurchase Program - Additional Information (Detail) (USD $) | 9 Months Ended | 12 Months Ended | 2 Months Ended |
--- | --- | --- | --- | ---
Jan. 31, 2015 | Jan. 31, 2015 | Feb. 02, 2013 | Apr. 10, 2015 | May 22, 2014
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Stock repurchase program, Expiration date | May 31, 2016 |  |  |  |
Repurchase and retirement of common stock, shares | 269,000 us-gaap_StockRepurchasedAndRetiredDuringPeriodShares |  |  |  |
Repurchase and retirement of common stock | $ 4,803,000 us-gaap_StockRepurchasedAndRetiredDuringPeriodValue | $ 4,803,000 us-gaap_StockRepurchasedAndRetiredDuringPeriodValue | $ 16,622,000 us-gaap_StockRepurchasedAndRetiredDuringPeriodValue |  |
Subsequent Event [Member] |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Repurchase and retirement of common stock, shares |  |  |  | 40,000 us-gaap_StockRepurchasedAndRetiredDuringPeriodShares / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Repurchase and retirement of common stock |  |  |  | 955,000 us-gaap_StockRepurchasedAndRetiredDuringPeriodValue / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Maximum [Member] |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Stock repurchase program, Authorized amount |  |  |  |  | $ 30,000,000 us-gaap_StockRepurchaseProgramAuthorizedAmount1 / us-gaap_RangeAxis = us-gaap_MaximumMember

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- Definition Number of shares that have been repurchased and retired during the period. + 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 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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- Definition Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital). + 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 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + Details
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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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- Definition Expiration date for the purchase of an entity's own shares under a stock repurchase plan, in the CCYY-MM-DD format. + References No definition available. + Details
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