Document and Entity Information	3 Months Ended
	Mar. 31, 2013	Apr. 26, 2013 Voting Common Stock	Apr. 26, 2013 Non-Voting Common Stock
Entity Registrant Name	PHI INC
Entity Central Index Key	0000350403
Document Type	10-Q
Document Period End Date	Mar. 31, 2013
Amendment Flag	false
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		2,905,757	12,567,879