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Shareholders' Equity (Detail Textuals 1) (Share Repurchase Plan, USD $) In Millions, unless otherwise specified | Mar. 31, 2015 | Aug. 01, 2011 | Nov. 01, 2010 | Oct. 31, 2008 | Nov. 08, 2006
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Share Repurchase Plan |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |
Amount approved of share repurchase plan |  | $ 20.0 us-gaap_StockRepurchaseProgramAuthorizedAmount1 / us-gaap_ShareRepurchaseProgramAxis = pets_ShareRepurchasePlanMember | $ 20.0 us-gaap_StockRepurchaseProgramAuthorizedAmount1 / us-gaap_ShareRepurchaseProgramAxis = pets_ShareRepurchasePlanMember | $ 20.0 us-gaap_StockRepurchaseProgramAuthorizedAmount1 / us-gaap_ShareRepurchaseProgramAxis = pets_ShareRepurchasePlanMember | $ 20.0 us-gaap_StockRepurchaseProgramAuthorizedAmount1 / us-gaap_ShareRepurchaseProgramAxis = pets_ShareRepurchasePlanMember
Value of remaining shares | $ 10.2 us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 / us-gaap_ShareRepurchaseProgramAxis = pets_ShareRepurchasePlanMember |  |  |  |

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- Details
Name: | pets_StockholdersEquityNoteLineItems
Namespace Prefix: | pets_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramAuthorizedAmount1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount remaining of a stock repurchase plan authorized. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant