Marketable Securities (Tables)

3 Months Ended

Nov. 30, 2013

Marketable Securities [Abstract]

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.