Summary of Significant Accounting Policies Retained Deficit (Details) $ in Millions	Sep. 30, 2017 USD ($)
Retained Earnings (Accumulated Deficit) [Abstract]
Cumulative share repurchases	$ 1,234.9
Cumulative dividends declared	$ 410.9

Cumulative Share Repurchases since inception of repurchase programs

No definition available.

Name:	pool_CumulativeShareRepurchases
Namespace Prefix:	pool_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant