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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
Share Repurchase Plan
          
Stockholders Equity Note [Line Items]          
Amount approved of share repurchase plan   $ 20.0us-gaap_StockRepurchaseProgramAuthorizedAmount1
/ us-gaap_ShareRepurchaseProgramAxis
= pets_ShareRepurchasePlanMember		 $ 20.0us-gaap_StockRepurchaseProgramAuthorizedAmount1
/ us-gaap_ShareRepurchaseProgramAxis
= pets_ShareRepurchasePlanMember		 $ 20.0us-gaap_StockRepurchaseProgramAuthorizedAmount1
/ us-gaap_ShareRepurchaseProgramAxis
= pets_ShareRepurchasePlanMember		 $ 20.0us-gaap_StockRepurchaseProgramAuthorizedAmount1
/ us-gaap_ShareRepurchaseProgramAxis
= pets_ShareRepurchasePlanMember
Value of remaining shares $ 10.2us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1
/ us-gaap_ShareRepurchaseProgramAxis
= pets_ShareRepurchasePlanMember