CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2015	[1]	Oct. 04, 2015	Jul. 05, 2015	Jul. 03, 2015	Mar. 31, 2015	[1]	Dec. 28, 2014	Sep. 28, 2014	Jun. 29, 2014	Mar. 31, 2014		Mar. 31, 2013
Current assets:
Cash and cash equivalents	$ 104,032	[2]	$ 65,087	$ 49,595	$ 49,595	$ 139,253	[2]	$ 112,920	$ 42,668	$ 132,739	$ 266,632	[2]	$ 417,288	[2]
Net receivables	1,670,821		1,789,963		1,774,715	1,696,529		1,255,374	1,216,362	1,240,892
Net inventories	213,212		175,317		182,276	196,114		134,241	130,962	148,056
Income taxes receivable	50,769				19	31,415		37,388	0
Deferred income taxes	0		211,687		211,695	211,721		175,763	210,465	168,644
Other current assets	89,645		126,815		128,310	118,491		71,414	39,284	47,323
Total current assets	2,128,479		2,368,869		2,346,610	2,393,523		2,619,411	2,538,381	2,617,093
Net property, plant, and equipment	761,694		750,080		758,820	769,050		479,005	478,909	480,782
Goodwill	1,828,366		1,862,255		1,862,255	1,862,255		1,039,763	1,039,763	1,039,763	1,039,763
Net intangibles	147,156		139,284		152,184	165,207		8,148	8,922	9,695
Deferred income taxes	318,538		127,520		143,262	145,036		77,313	85,971	85,311
Other noncurrent assets	139,462		131,354		135,678	142,461		108,954	110,075	109,543
Total assets	5,323,695		5,379,362		5,398,809	5,477,532		5,823,906	5,874,197	5,974,098	3,490,706
Current liabilities:
Current portion of long-term debt	40,000		40,000		59,997	59,997		159,997	159,997	247,666
Accounts payable	130,812		227,051		168,827	158,137		218,321	185,779	185,930
Contract-related liabilities	381,712		276,441		312,145	358,518				0
Contract loss reserve	235,841		242,744		253,410	262,324		279,874	302,716	321,807
Contract advances and allowances	172,046		154,845		178,182	173,198		142,742	118,600	120,032
Accrued compensation	127,928		143,450		102,108	144,185		78,965	66,096	70,076
Other current liabilities	166,096		167,458		186,373	220,749		181,880	182,619	174,829
Total current liabilities	1,254,435		1,251,989		1,261,042	1,377,108		1,339,756	1,305,315	1,428,600
Long-term debt	1,435,836		1,481,746		1,497,958	1,511,936		1,887,109	1,901,421	1,820,653
Postretirement and postemployment benefits	59,202		70,342		72,353	74,658		64,657	66,117	69,194
Pension	761,632		811,459		845,562	851,001		439,469	490,664	518,744
Other noncurrent liabilities	127,152		131,151		130,332	141,433		101,906	100,538	101,379
Total liabilities	3,638,257		3,746,687		3,807,247	3,956,136		4,028,947	4,119,744	4,198,496
Commitments and contingencies (Notes 11, 13 and 14)
Common stock—$.01 par value: authorized—180,000,000 shares; issued and outstanding— 58,729,995 shares held December 31, 2015 and 59,427,942 shares at March 31, 2015	587		589		593	594		319	319	319
Additional paid-in-capital	2,187,940		2,181,288		2,187,768	2,182,814		435,746	431,967	540,080
Retained earnings	1,043,043		1,010,527		951,825	894,008		2,730,772	2,698,127	2,616,557
Accumulated other comprehensive loss	(785,908)		(813,594)		(829,045)	(847,648)		(652,900)	(656,538)	(662,219)	(680,809)
Common stock in treasury, at cost— 10,205,029 shares held at December 31, 2015 and 9,507,082 shares held at March 31, 2015	(771,029)		(757,061)		(730,358)	(719,034)		(729,832)	(730,135)	(729,767)
Total Orbital ATK, Inc. stockholders' equity	1,674,633		1,621,749		1,580,783	1,510,734		1,784,105	1,743,740	1,764,970
Noncontrolling interest	10,805		10,926		10,779	10,662		10,854	10,713	10,632
Total equity	1,685,438	[3]	1,632,675		1,591,562	1,521,396		1,794,959	1,754,453	1,775,602	$ 1,676,888	[3]	$ 1,491,192	[3]
Total liabilities and equity	$ 5,323,695		$ 5,379,362		$ 5,398,809	$ 5,477,532		$ 5,823,906	$ 5,874,197	$ 5,974,098

[1] See Note 2 - Restatement

[2] See Note 2 - Restatement

[3] See Note 2 - Restatement