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Summary of Significant Accounting Policies - Retained Deficit (Details) $ in Millions | Sep. 30, 2019 USD ($)
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Retained Earnings (Accumulated Deficit) [Abstract] |
Cumulative share repurchases | $ 1,400.0
Cumulative dividends | $ 556.9

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- Definition Cumulative Share Repurchases since inception of repurchase programs + References No definition available. + Details
Name: | pool_CumulativeShareRepurchases
Namespace Prefix: | pool_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of cumulative cash dividends distributed to shareholders. + References No definition available. + Details
Name: | us-gaap_CumulativeDividends
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_RetainedEarningsAccumulatedDeficitAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration