Marketable Securities

3 Months Ended

Nov. 30, 2013

Marketable Securities [Abstract]

Marketable Securities

Marketable Securities

Marketable securities consist of the following as of the respective periods:

	Current				Noncurrent
($ in thousands)	November 30, 2013		August 31, 2013		November 30, 2013		August 31, 2013
Tax-exempt municipal bonds	$	57,169	$	69,621	$	43,879	$	24,070
Commercial paper	28,109		9,828		—		—
Corporate bonds	26,480		24,503		56,206		13,925
Other(1)	16,978		1,857		2,694		—
Total held-to-maturity securities	128,736		105,809		102,779		37,995
Available-for-sale auction-rate securities	—		—		5,946		5,946
Total marketable securities	$	128,736	$	105,809	$	108,725	$	43,941

⁽¹⁾ Other principally consists of certificates of deposit.

Our marketable securities are classified as held-to-maturity as we have the intent and ability to hold them until contractual maturity, which will occur within two years. Our held-to-maturity securities are reported at amortized cost, which approximates fair value. We determine the fair value of our held-to-maturity investments using a market approach principally consisting of Level 2 inputs. These inputs include quoted prices for similar assets in active markets, or quoted prices for identical or similar assets in markets that are not active. We have not recorded gains or losses on our held-to-maturity investments.

Our auction-rate securities are classified as available-for-sale and reported at fair value. We have classified our auction-rate securities as noncurrent due to illiquidity considerations. Refer to Note 6, Fair Value Measurements.