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Accounts Receivable and Allowance for Doubtful Receivables - Allowance for Doubtful Receivables (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
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Nov. 30, 2014 | Nov. 30, 2013 | Nov. 30, 2014 | Nov. 30, 2013
Receivables [Abstract] |  |  |  |
Balance at beginning of period | $ 3,584 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent | $ 3,748 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent | $ 3,672 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent | $ 3,952 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Bad debt expense | 494 us-gaap_ProvisionForDoubtfulAccounts | 618 us-gaap_ProvisionForDoubtfulAccounts | 725 us-gaap_ProvisionForDoubtfulAccounts | 2,816 us-gaap_ProvisionForDoubtfulAccounts
Recoveries | 10 us-gaap_AllowanceForDoubtfulAccountsReceivableRecoveries | 9 us-gaap_AllowanceForDoubtfulAccountsReceivableRecoveries | 29 us-gaap_AllowanceForDoubtfulAccountsReceivableRecoveries | 28 us-gaap_AllowanceForDoubtfulAccountsReceivableRecoveries
Accounts written off | (113)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs | (484)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs | (451)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs | (2,905)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs
Balance at end of period | $ 3,975 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent | $ 3,891 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent | $ 3,975 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent | $ 3,891 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent

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- Definition A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 4 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Amount of recoveries of receivables doubtful of collection that were previously charged off. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount of direct write-downs of accounts receivable charged against the allowance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5074-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 310 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35755819&loc=SL9156395-115594 + Details
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- Definition Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.5) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 5 -Article 5 + Details
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- Details
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