The best replacement for idea is ideal.

The best alternatives to idea are rated as following:
★★★★★  ideal
★★★★  504
★★  concept
★★  ada
★★  nclb
★★  eclipse
★★  opportunity
★  section 504
★  idear
★  acl
★  theme
★  invention
★  ideology
★  ideia
★  airtel
★  vodafone
  idea
  netbeans
  execution
  vodafone which is best
  phantasm
  topic sentence
  product
  notion
  padi
  thought
  bsnl
  summary
  main idea
  i have no idea
  pycharm
  topic
  summarizing
  central idea
  iep
  supporting details
  controlling idea
  airtel which is best
  504 plan
  god idea
  expression
  docomo which is best
  main topic
  no idea

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Speaking about idea, one probably shouldn't forget about alcatel.

Other search terms related to idea and their ratings are:
★★★★★ alcatel
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Google Trends

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idea
ideal
504