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Restructuring Charges Related to Previously Recorded Charges (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Mar. 27, 2015
Mar. 28, 2014
Mar. 27, 2015
Mar. 28, 2014
Restructuring Cost and Reserve [Line Items]        
Accretion of interest expense $ 13us-gaap_AccretionExpense $ 10us-gaap_AccretionExpense $ 23us-gaap_AccretionExpense $ 21us-gaap_AccretionExpense
Accrued Compensation        
Restructuring Cost and Reserve [Line Items]        
Beginning balance     16us-gaap_RestructuringReserveCurrent
/ us-gaap_BalanceSheetLocationAxis
= plnr_AccruedCompensationMember
 
Additional charges     30us-gaap_RestructuringCharges
/ us-gaap_BalanceSheetLocationAxis
= plnr_AccruedCompensationMember
 
Cash paid     (41)us-gaap_PaymentsForRestructuring
/ us-gaap_BalanceSheetLocationAxis
= plnr_AccruedCompensationMember
 
Ending balance 5us-gaap_RestructuringReserveCurrent
/ us-gaap_BalanceSheetLocationAxis
= plnr_AccruedCompensationMember
  5us-gaap_RestructuringReserveCurrent
/ us-gaap_BalanceSheetLocationAxis
= plnr_AccruedCompensationMember
 
Other Current Liabilities        
Restructuring Cost and Reserve [Line Items]        
Beginning balance     705us-gaap_RestructuringReserveCurrent
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentLiabilitiesMember
 
Accretion of interest expense     23us-gaap_AccretionExpense
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentLiabilitiesMember
 
Cash paid     (358)us-gaap_PaymentsForRestructuring
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentLiabilitiesMember
 
Reclassification from other long-term liabilities to other current liabilities     341plnr_RestructuringChargesAndOtherCharges
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentLiabilitiesMember
 
Ending balance 711us-gaap_RestructuringReserveCurrent
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentLiabilitiesMember
  711us-gaap_RestructuringReserveCurrent
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentLiabilitiesMember
 
Other Long-term Liabilities        
Restructuring Cost and Reserve [Line Items]        
Beginning balance     1,662us-gaap_RestructuringReserveCurrent
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherNoncurrentLiabilitiesMember
 
Reclassification from other long-term liabilities to other current liabilities     (341)plnr_RestructuringChargesAndOtherCharges
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherNoncurrentLiabilitiesMember
 
Ending balance $ 1,321us-gaap_RestructuringReserveCurrent
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherNoncurrentLiabilitiesMember
  $ 1,321us-gaap_RestructuringReserveCurrent
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherNoncurrentLiabilitiesMember