Slicers (applies to each fact value in each table cell)

Reporting Entity [Axis]

0000866121 (http://www.sec.gov/CIK)

Income Taxes	Period [Axis]
	2011-04-01 - 2012-03-31	2010-04-01 - 2011-03-31	2009-04-01 - 2010-03-31
Income Taxes
Income before income taxes and noncontrolling interest
Current:
US	403,204,000	436,026,000	433,428,000
Non-US	3,762,000	2,648,000	1,989,000
Income before income taxes and noncontrolling interest	406,966,000	438,674,000	435,417,000
Income tax provision
Current:
Federal	128,651,000	95,840,000	152,421,000
State	7,176,000	6,054,000	7,390,000
Non-US	414,000	51,000
Deferred:
Federal	7,315,000	25,486,000	(7,662,000)
State	206,000	(2,468,000)	4,324,000
Non-US
Income tax provision	143,762,000	124,963,000	156,473,000
Items responsible for the differences between the federal statutory rate and ATK's effective rate
Statutory federal income tax rate (as a percent)	.350	.35	.35
State income taxes, net of federal impact (as a percent)	.026	.02	.024
Domestic manufacturing deduction (as a percent)	(.026)	(.022)	(.018)
Estimated nondeductible portion of litigation (as a percent)	.013
Research and development credit (as a percent)	(.005)	(.009)	(.006)
Change in prior year contingent tax liabilities (as a percent)	(.002)	(.041)	.005
Impact of non-US operations (as a percent)	(.003)	(.002)
Other (as a percent)	(.002)	(.01)	.002
Change in valuation allowance (as a percent)	.002	(.001)	.002
Income tax provision (as a percent)	.353	.285	.359
Components of deferred tax assets and liabilities
Deferred tax assets	871,228,000	785,786,000
Deferred tax liabilities	(630,035,000)	(615,303,000)
Valuation allowance	(4,121,000)
Net deferred income tax asset	166,362,000
Deferred tax assets and liabilities resulted from temporary differences
Other comprehensive income provision	574,968,000	489,423,000
Postretirement benefit obligations	46,991,000	51,069,000
Accruals for employee benefits	38,159,000	44,242,000
Other reserves	37,950,000	31,638,000
Other	36,644,000	20,822,000
Contract method of revenue recognition	19,737,000	(9,024,000)
State carryforwards	9,564,000	12,609,000
Inventory	8,943,000	13,130,000
Pension	(296,455,000)	(275,360,000)
Property, plant, and equipment	(98,561,000)	(82,164,000)
Intangible assets	(71,818,000)	(63,939,000)
Debt-related	(64,929,000)	(61,963,000)
Valuation allowance	(4,754,000)	(4,121,000)
Net deferred income tax asset	236,439,000	166,362,000