There are numerous hiking guidebooks out there that cover Idaho. Below are the ones I own and use.  

Idaho: A Climbing Guide by Tom Lopez – This is far and away the premier mountaineering text for the state. Includes trailhead directions and details for mountain climbing across the entire state of Idaho.
Backpacking Idaho by Douglas Lorain – Lots of detailed multi-day trip recommendations from all over the state. The book includes suggested itineraries, possible campsites, and navigation instructions.
The Hiker's Guide Idaho's Sawtooth Country by Scott Marchant – Great hikes in the Sawtooths and White Clouds. Scott uses a thorough but easy to read format that takes all the work out of choosing and preparing for your hike. His other books include The Hiker's Guide to McCall & Cascade, The Day Hiker's Guide to Sun Valley & Ketchum, and The Hiker's Guide Greater Boise. The whole collection is highly recommended.
Exploring the Boulder-White Clouds by Matt Leidecker – Easy to see that a tremendous amount of TLC went into this guide, which includes excellent maps as well as history, geology, etc. Matt's other similarly great guidebooks include Exploring the Sawtooths, and Exploring Sun Valley. You're sure to find some hidden gem hikes in each of these.
Trails of the Sawtooth and White Cloud Mountains by Margaret Fuller – Detailed descriptions of hikes in the White Clouds and neighboring Sawtooths. Also recommended by Idaho's pioneer guidebook author are Trails of Eastern Idaho, Trails of Western Idaho, and Trails of the Frank Church: River of No Return Wilderness.
In The Wild Chef: Recipes From Base Camp To Summit by Steve Weston – Not a guidebook, but a must have if you spend any time in the back-country. I've totally given up Mountain House since I started using the easy to make recipes from this book created by my friend Steve.

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